Update example skills and rename 'artifacts-builder' (#112)

* Export updated examples

* Rename 'artifacts-builder' to 'web-artifacts-builder'

slack-gif-creator/SKILL.md

@@ -1,646 +1,254 @@
 ---
 name: slack-gif-creator
-description: Toolkit for creating animated GIFs optimized for Slack, with validators for size constraints and composable animation primitives. This skill applies when users request animated GIFs or emoji animations for Slack from descriptions like "make me a GIF for Slack of X doing Y".
+description: Knowledge and utilities for creating animated GIFs optimized for Slack. Provides constraints, validation tools, and animation concepts. Use when users request animated GIFs for Slack like "make me a GIF of X doing Y for Slack."
 license: Complete terms in LICENSE.txt
 ---
 
-# Slack GIF Creator - Flexible Toolkit
+# Slack GIF Creator
 
-A toolkit for creating animated GIFs optimized for Slack. Provides validators for Slack's constraints, composable animation primitives, and optional helper utilities. **Apply these tools however needed to achieve the creative vision.**
+A toolkit providing utilities and knowledge for creating animated GIFs optimized for Slack.
 
-## Slack's Requirements
+## Slack Requirements
 
-Slack has specific requirements for GIFs based on their use:
+**Dimensions:**
+- Emoji GIFs: 128x128 (recommended)
+- Message GIFs: 480x480
 
-**Message GIFs:**
-- Max size: ~2MB
-- Optimal dimensions: 480x480
-- Typical FPS: 15-20
-- Color limit: 128-256
-- Duration: 2-5s
+**Parameters:**
+- FPS: 10-30 (lower is smaller file size)
+- Colors: 48-128 (fewer = smaller file size)
+- Duration: Keep under 3 seconds for emoji GIFs
 
-**Emoji GIFs:**
-- Max size: 64KB (strict limit)
-- Optimal dimensions: 128x128
-- Typical FPS: 10-12
-- Color limit: 32-48
-- Duration: 1-2s
-
-**Emoji GIFs are challenging** - the 64KB limit is strict. Strategies that help:
-- Limit to 10-15 frames total
-- Use 32-48 colors maximum
-- Keep designs simple
-- Avoid gradients
-- Validate file size frequently
-
-## Toolkit Structure
-
-This skill provides three types of tools:
-
-1. **Validators** - Check if a GIF meets Slack's requirements
-2. **Animation Primitives** - Composable building blocks for motion (shake, bounce, move, kaleidoscope)
-3. **Helper Utilities** - Optional functions for common needs (text, colors, effects)
-
-**Complete creative freedom is available in how these tools are applied.**
-
-## Core Validators
-
-To ensure a GIF meets Slack's constraints, use these validators:
+## Core Workflow
 
 ```python
 from core.gif_builder import GIFBuilder
+from PIL import Image, ImageDraw
 
-# After creating your GIF, check if it meets requirements
+# 1. Create builder
 builder = GIFBuilder(width=128, height=128, fps=10)
-# ... add your frames however you want ...
 
-# Save and check size
-info = builder.save('emoji.gif', num_colors=48, optimize_for_emoji=True)
+# 2. Generate frames
+for i in range(12):
+    frame = Image.new('RGB', (128, 128), (240, 248, 255))
+    draw = ImageDraw.Draw(frame)
 
-# The save method automatically warns if file exceeds limits
-# info dict contains: size_kb, size_mb, frame_count, duration_seconds
+    # Draw your animation using PIL primitives
+    # (circles, polygons, lines, etc.)
+
+    builder.add_frame(frame)
+
+# 3. Save with optimization
+builder.save('output.gif', num_colors=48, optimize_for_emoji=True)
 ```
 
-**File size validator**:
+## Drawing Graphics
+
+### Working with User-Uploaded Images
+If a user uploads an image, consider whether they want to:
+- **Use it directly** (e.g., "animate this", "split this into frames")
+- **Use it as inspiration** (e.g., "make something like this")
+
+Load and work with images using PIL:
 ```python
-from core.validators import check_slack_size
+from PIL import Image
 
-# Check if GIF meets size limits
-passes, info = check_slack_size('emoji.gif', is_emoji=True)
-# Returns: (True/False, dict with size details)
+uploaded = Image.open('file.png')
+# Use directly, or just as reference for colors/style
 ```
 
-**Dimension validator**:
+### Drawing from Scratch
+When drawing graphics from scratch, use PIL ImageDraw primitives:
+
 ```python
-from core.validators import validate_dimensions
+from PIL import ImageDraw
 
-# Check dimensions
-passes, info = validate_dimensions(128, 128, is_emoji=True)
-# Returns: (True/False, dict with dimension details)
+draw = ImageDraw.Draw(frame)
+
+# Circles/ovals
+draw.ellipse([x1, y1, x2, y2], fill=(r, g, b), outline=(r, g, b), width=3)
+
+# Stars, triangles, any polygon
+points = [(x1, y1), (x2, y2), (x3, y3), ...]
+draw.polygon(points, fill=(r, g, b), outline=(r, g, b), width=3)
+
+# Lines
+draw.line([(x1, y1), (x2, y2)], fill=(r, g, b), width=5)
+
+# Rectangles
+draw.rectangle([x1, y1, x2, y2], fill=(r, g, b), outline=(r, g, b), width=3)
 ```
 
-**Complete validation**:
+**Don't use:** Emoji fonts (unreliable across platforms) or assume pre-packaged graphics exist in this skill.
+
+### Making Graphics Look Good
+
+Graphics should look polished and creative, not basic. Here's how:
+
+**Use thicker lines** - Always set `width=2` or higher for outlines and lines. Thin lines (width=1) look choppy and amateurish.
+
+**Add visual depth**:
+- Use gradients for backgrounds (`create_gradient_background`)
+- Layer multiple shapes for complexity (e.g., a star with a smaller star inside)
+
+**Make shapes more interesting**:
+- Don't just draw a plain circle - add highlights, rings, or patterns
+- Stars can have glows (draw larger, semi-transparent versions behind)
+- Combine multiple shapes (stars + sparkles, circles + rings)
+
+**Pay attention to colors**:
+- Use vibrant, complementary colors
+- Add contrast (dark outlines on light shapes, light outlines on dark shapes)
+- Consider the overall composition
+
+**For complex shapes** (hearts, snowflakes, etc.):
+- Use combinations of polygons and ellipses
+- Calculate points carefully for symmetry
+- Add details (a heart can have a highlight curve, snowflakes have intricate branches)
+
+Be creative and detailed! A good Slack GIF should look polished, not like placeholder graphics.
+
+## Available Utilities
+
+### GIFBuilder (`core.gif_builder`)
+Assembles frames and optimizes for Slack:
+```python
+builder = GIFBuilder(width=128, height=128, fps=10)
+builder.add_frame(frame)  # Add PIL Image
+builder.add_frames(frames)  # Add list of frames
+builder.save('out.gif', num_colors=48, optimize_for_emoji=True, remove_duplicates=True)
+```
+
+### Validators (`core.validators`)
+Check if GIF meets Slack requirements:
 ```python
 from core.validators import validate_gif, is_slack_ready
 
-# Run all validations
-all_pass, results = validate_gif('emoji.gif', is_emoji=True)
+# Detailed validation
+passes, info = validate_gif('my.gif', is_emoji=True, verbose=True)
 
-# Or quick check
-if is_slack_ready('emoji.gif', is_emoji=True):
-    print("Ready to upload!")
+# Quick check
+if is_slack_ready('my.gif'):
+    print("Ready!")
 ```
 
-## Animation Primitives
-
-These are composable building blocks for motion. Apply these to any object in any combination:
-
-### Shake
-```python
-from templates.shake import create_shake_animation
-
-# Shake an emoji
-frames = create_shake_animation(
-    object_type='emoji',
-    object_data={'emoji': '😱', 'size': 80},
-    num_frames=20,
-    shake_intensity=15,
-    direction='both'  # or 'horizontal', 'vertical'
-)
-```
-
-### Bounce
-```python
-from templates.bounce import create_bounce_animation
-
-# Bounce a circle
-frames = create_bounce_animation(
-    object_type='circle',
-    object_data={'radius': 40, 'color': (255, 100, 100)},
-    num_frames=30,
-    bounce_height=150
-)
-```
-
-### Spin / Rotate
-```python
-from templates.spin import create_spin_animation, create_loading_spinner
-
-# Clockwise spin
-frames = create_spin_animation(
-    object_type='emoji',
-    object_data={'emoji': '🔄', 'size': 100},
-    rotation_type='clockwise',
-    full_rotations=2
-)
-
-# Wobble rotation
-frames = create_spin_animation(rotation_type='wobble', full_rotations=3)
-
-# Loading spinner
-frames = create_loading_spinner(spinner_type='dots')
-```
-
-### Pulse / Heartbeat
-```python
-from templates.pulse import create_pulse_animation, create_attention_pulse
-
-# Smooth pulse
-frames = create_pulse_animation(
-    object_data={'emoji': '❤️', 'size': 100},
-    pulse_type='smooth',
-    scale_range=(0.8, 1.2)
-)
-
-# Heartbeat (double-pump)
-frames = create_pulse_animation(pulse_type='heartbeat')
-
-# Attention pulse for emoji GIFs
-frames = create_attention_pulse(emoji='⚠️', num_frames=20)
-```
-
-### Fade
-```python
-from templates.fade import create_fade_animation, create_crossfade
-
-# Fade in
-frames = create_fade_animation(fade_type='in')
-
-# Fade out
-frames = create_fade_animation(fade_type='out')
-
-# Crossfade between two emojis
-frames = create_crossfade(
-    object1_data={'emoji': '😊', 'size': 100},
-    object2_data={'emoji': '😂', 'size': 100}
-)
-```
-
-### Zoom
-```python
-from templates.zoom import create_zoom_animation, create_explosion_zoom
-
-# Zoom in dramatically
-frames = create_zoom_animation(
-    zoom_type='in',
-    scale_range=(0.1, 2.0),
-    add_motion_blur=True
-)
-
-# Zoom out
-frames = create_zoom_animation(zoom_type='out')
-
-# Explosion zoom
-frames = create_explosion_zoom(emoji='💥')
-```
-
-### Explode / Shatter
-```python
-from templates.explode import create_explode_animation, create_particle_burst
-
-# Burst explosion
-frames = create_explode_animation(
-    explode_type='burst',
-    num_pieces=25
-)
-
-# Shatter effect
-frames = create_explode_animation(explode_type='shatter')
-
-# Dissolve into particles
-frames = create_explode_animation(explode_type='dissolve')
-
-# Particle burst
-frames = create_particle_burst(particle_count=30)
-```
-
-### Wiggle / Jiggle
-```python
-from templates.wiggle import create_wiggle_animation, create_excited_wiggle
-
-# Jello wobble
-frames = create_wiggle_animation(
-    wiggle_type='jello',
-    intensity=1.0,
-    cycles=2
-)
-
-# Wave motion
-frames = create_wiggle_animation(wiggle_type='wave')
-
-# Excited wiggle for emoji GIFs
-frames = create_excited_wiggle(emoji='🎉')
-```
-
-### Slide
-```python
-from templates.slide import create_slide_animation, create_multi_slide
-
-# Slide in from left with overshoot
-frames = create_slide_animation(
-    direction='left',
-    slide_type='in',
-    overshoot=True
-)
-
-# Slide across
-frames = create_slide_animation(direction='left', slide_type='across')
-
-# Multiple objects sliding in sequence
-objects = [
-    {'data': {'emoji': '🎯', 'size': 60}, 'direction': 'left', 'final_pos': (120, 240)},
-    {'data': {'emoji': '🎪', 'size': 60}, 'direction': 'right', 'final_pos': (240, 240)}
-]
-frames = create_multi_slide(objects, stagger_delay=5)
-```
-
-### Flip
-```python
-from templates.flip import create_flip_animation, create_quick_flip
-
-# Horizontal flip between two emojis
-frames = create_flip_animation(
-    object1_data={'emoji': '😊', 'size': 120},
-    object2_data={'emoji': '😂', 'size': 120},
-    flip_axis='horizontal'
-)
-
-# Vertical flip
-frames = create_flip_animation(flip_axis='vertical')
-
-# Quick flip for emoji GIFs
-frames = create_quick_flip('👍', '👎')
-```
-
-### Morph / Transform
-```python
-from templates.morph import create_morph_animation, create_reaction_morph
-
-# Crossfade morph
-frames = create_morph_animation(
-    object1_data={'emoji': '😊', 'size': 100},
-    object2_data={'emoji': '😂', 'size': 100},
-    morph_type='crossfade'
-)
-
-# Scale morph (shrink while other grows)
-frames = create_morph_animation(morph_type='scale')
-
-# Spin morph (3D flip-like)
-frames = create_morph_animation(morph_type='spin_morph')
-```
-
-### Move Effect
-```python
-from templates.move import create_move_animation
-
-# Linear movement
-frames = create_move_animation(
-    object_type='emoji',
-    object_data={'emoji': '🚀', 'size': 60},
-    start_pos=(50, 240),
-    end_pos=(430, 240),
-    motion_type='linear',
-    easing='ease_out'
-)
-
-# Arc movement (parabolic trajectory)
-frames = create_move_animation(
-    object_type='emoji',
-    object_data={'emoji': '⚽', 'size': 60},
-    start_pos=(50, 350),
-    end_pos=(430, 350),
-    motion_type='arc',
-    motion_params={'arc_height': 150}
-)
-
-# Circular movement
-frames = create_move_animation(
-    object_type='emoji',
-    object_data={'emoji': '🌍', 'size': 50},
-    motion_type='circle',
-    motion_params={
-        'center': (240, 240),
-        'radius': 120,
-        'angle_range': 360  # full circle
-    }
-)
-
-# Wave movement
-frames = create_move_animation(
-    motion_type='wave',
-    motion_params={
-        'wave_amplitude': 50,
-        'wave_frequency': 2
-    }
-)
-
-# Or use low-level easing functions
-from core.easing import interpolate, calculate_arc_motion
-
-for i in range(num_frames):
-    t = i / (num_frames - 1)
-    x = interpolate(start_x, end_x, t, easing='ease_out')
-    # Or: x, y = calculate_arc_motion(start, end, height, t)
-```
-
-### Kaleidoscope Effect
-```python
-from templates.kaleidoscope import apply_kaleidoscope, create_kaleidoscope_animation
-
-# Apply to a single frame
-kaleido_frame = apply_kaleidoscope(frame, segments=8)
-
-# Or create animated kaleidoscope
-frames = create_kaleidoscope_animation(
-    base_frame=my_frame,  # or None for demo pattern
-    num_frames=30,
-    segments=8,
-    rotation_speed=1.0
-)
-
-# Simple mirror effects (faster)
-from templates.kaleidoscope import apply_simple_mirror
-
-mirrored = apply_simple_mirror(frame, mode='quad')  # 4-way mirror
-# modes: 'horizontal', 'vertical', 'quad', 'radial'
-```
-
-**To compose primitives freely, follow these patterns:**
-```python
-# Example: Bounce + shake for impact
-for i in range(num_frames):
-    frame = create_blank_frame(480, 480, bg_color)
-
-    # Bounce motion
-    t_bounce = i / (num_frames - 1)
-    y = interpolate(start_y, ground_y, t_bounce, 'bounce_out')
-
-    # Add shake on impact (when y reaches ground)
-    if y >= ground_y - 5:
-        shake_x = math.sin(i * 2) * 10
-        x = center_x + shake_x
-    else:
-        x = center_x
-
-    draw_emoji(frame, '⚽', (x, y), size=60)
-    builder.add_frame(frame)
-```
-
-## Helper Utilities
-
-These are optional helpers for common needs. **Use, modify, or replace these with custom implementations as needed.**
-
-### GIF Builder (Assembly & Optimization)
-
-```python
-from core.gif_builder import GIFBuilder
-
-# Create builder with your chosen settings
-builder = GIFBuilder(width=480, height=480, fps=20)
-
-# Add frames (however you created them)
-for frame in my_frames:
-    builder.add_frame(frame)
-
-# Save with optimization
-builder.save('output.gif',
-             num_colors=128,
-             optimize_for_emoji=False)
-```
-
-Key features:
-- Automatic color quantization
-- Duplicate frame removal
-- Size warnings for Slack limits
-- Emoji mode (aggressive optimization)
-
-### Text Rendering
-
-For small GIFs like emojis, text readability is challenging. A common solution involves adding outlines:
-
-```python
-from core.typography import draw_text_with_outline, TYPOGRAPHY_SCALE
-
-# Text with outline (helps readability)
-draw_text_with_outline(
-    frame, "BONK!",
-    position=(240, 100),
-    font_size=TYPOGRAPHY_SCALE['h1'],  # 60px
-    text_color=(255, 68, 68),
-    outline_color=(0, 0, 0),
-    outline_width=4,
-    centered=True
-)
-```
-
-To implement custom text rendering, use PIL's `ImageDraw.text()` which works fine for larger GIFs.
-
-### Color Management
-
-Professional-looking GIFs often use cohesive color palettes:
-
-```python
-from core.color_palettes import get_palette
-
-# Get a pre-made palette
-palette = get_palette('vibrant')  # or 'pastel', 'dark', 'neon', 'professional'
-
-bg_color = palette['background']
-text_color = palette['primary']
-accent_color = palette['accent']
-```
-
-To work with colors directly, use RGB tuples - whatever works for the use case.
-
-### Visual Effects
-
-Optional effects for impact moments:
-
-```python
-from core.visual_effects import ParticleSystem, create_impact_flash, create_shockwave_rings
-
-# Particle system
-particles = ParticleSystem()
-particles.emit_sparkles(x=240, y=200, count=15)
-particles.emit_confetti(x=240, y=200, count=20)
-
-# Update and render each frame
-particles.update()
-particles.render(frame)
-
-# Flash effect
-frame = create_impact_flash(frame, position=(240, 200), radius=100)
-
-# Shockwave rings
-frame = create_shockwave_rings(frame, position=(240, 200), radii=[30, 60, 90])
-```
-
-### Easing Functions
-
-Smooth motion uses easing instead of linear interpolation:
-
+### Easing Functions (`core.easing`)
+Smooth motion instead of linear:
 ```python
 from core.easing import interpolate
 
-# Object falling (accelerates)
-y = interpolate(start=0, end=400, t=progress, easing='ease_in')
+# Progress from 0.0 to 1.0
+t = i / (num_frames - 1)
 
-# Object landing (decelerates)
-y = interpolate(start=0, end=400, t=progress, easing='ease_out')
+# Apply easing
+y = interpolate(start=0, end=400, t=t, easing='ease_out')
 
-# Bouncing
-y = interpolate(start=0, end=400, t=progress, easing='bounce_out')
-
-# Overshoot (elastic)
-scale = interpolate(start=0.5, end=1.0, t=progress, easing='elastic_out')
+# Available: linear, ease_in, ease_out, ease_in_out,
+#           bounce_out, elastic_out, back_out
 ```
 
-Available easings: `linear`, `ease_in`, `ease_out`, `ease_in_out`, `bounce_out`, `elastic_out`, `back_out` (overshoot), and more in `core/easing.py`.
-
-### Frame Composition
-
-Basic drawing utilities if you need them:
-
+### Frame Helpers (`core.frame_composer`)
+Convenience functions for common needs:
 ```python
 from core.frame_composer import (
-    create_gradient_background,  # Gradient backgrounds
-    draw_emoji_enhanced,         # Emoji with optional shadow
-    draw_circle_with_shadow,     # Shapes with depth
-    draw_star                    # 5-pointed stars
+    create_blank_frame,         # Solid color background
+    create_gradient_background,  # Vertical gradient
+    draw_circle,                # Helper for circles
+    draw_text,                  # Simple text rendering
+    draw_star                   # 5-pointed star
 )
-
-# Gradient background
-frame = create_gradient_background(480, 480, top_color, bottom_color)
-
-# Emoji with shadow
-draw_emoji_enhanced(frame, '🎉', position=(200, 200), size=80, shadow=True)
 ```
 
+## Animation Concepts
+
+### Shake/Vibrate
+Offset object position with oscillation:
+- Use `math.sin()` or `math.cos()` with frame index
+- Add small random variations for natural feel
+- Apply to x and/or y position
+
+### Pulse/Heartbeat
+Scale object size rhythmically:
+- Use `math.sin(t * frequency * 2 * math.pi)` for smooth pulse
+- For heartbeat: two quick pulses then pause (adjust sine wave)
+- Scale between 0.8 and 1.2 of base size
+
+### Bounce
+Object falls and bounces:
+- Use `interpolate()` with `easing='bounce_out'` for landing
+- Use `easing='ease_in'` for falling (accelerating)
+- Apply gravity by increasing y velocity each frame
+
+### Spin/Rotate
+Rotate object around center:
+- PIL: `image.rotate(angle, resample=Image.BICUBIC)`
+- For wobble: use sine wave for angle instead of linear
+
+### Fade In/Out
+Gradually appear or disappear:
+- Create RGBA image, adjust alpha channel
+- Or use `Image.blend(image1, image2, alpha)`
+- Fade in: alpha from 0 to 1
+- Fade out: alpha from 1 to 0
+
+### Slide
+Move object from off-screen to position:
+- Start position: outside frame bounds
+- End position: target location
+- Use `interpolate()` with `easing='ease_out'` for smooth stop
+- For overshoot: use `easing='back_out'`
+
+### Zoom
+Scale and position for zoom effect:
+- Zoom in: scale from 0.1 to 2.0, crop center
+- Zoom out: scale from 2.0 to 1.0
+- Can add motion blur for drama (PIL filter)
+
+### Explode/Particle Burst
+Create particles radiating outward:
+- Generate particles with random angles and velocities
+- Update each particle: `x += vx`, `y += vy`
+- Add gravity: `vy += gravity_constant`
+- Fade out particles over time (reduce alpha)
+
 ## Optimization Strategies
 
-When your GIF is too large:
+Only when asked to make the file size smaller, implement a few of the following methods:
 
-**For Message GIFs (>2MB):**
-1. Reduce frames (lower FPS or shorter duration)
-2. Reduce colors (128 → 64 colors)
-3. Reduce dimensions (480x480 → 320x320)
-4. Enable duplicate frame removal
+1. **Fewer frames** - Lower FPS (10 instead of 20) or shorter duration
+2. **Fewer colors** - `num_colors=48` instead of 128
+3. **Smaller dimensions** - 128x128 instead of 480x480
+4. **Remove duplicates** - `remove_duplicates=True` in save()
+5. **Emoji mode** - `optimize_for_emoji=True` auto-optimizes
 
-**For Emoji GIFs (>64KB) - be aggressive:**
-1. Limit to 10-12 frames total
-2. Use 32-40 colors maximum
-3. Avoid gradients (solid colors compress better)
-4. Simplify design (fewer elements)
-5. Use `optimize_for_emoji=True` in save method
-
-## Example Composition Patterns
-
-### Simple Reaction (Pulsing)
 ```python
-builder = GIFBuilder(128, 128, 10)
-
-for i in range(12):
-    frame = Image.new('RGB', (128, 128), (240, 248, 255))
-
-    # Pulsing scale
-    scale = 1.0 + math.sin(i * 0.5) * 0.15
-    size = int(60 * scale)
-
-    draw_emoji_enhanced(frame, '😱', position=(64-size//2, 64-size//2),
-                       size=size, shadow=False)
-    builder.add_frame(frame)
-
-builder.save('reaction.gif', num_colors=40, optimize_for_emoji=True)
-
-# Validate
-from core.validators import check_slack_size
-check_slack_size('reaction.gif', is_emoji=True)
-```
-
-### Action with Impact (Bounce + Flash)
-```python
-builder = GIFBuilder(480, 480, 20)
-
-# Phase 1: Object falls
-for i in range(15):
-    frame = create_gradient_background(480, 480, (240, 248, 255), (200, 230, 255))
-    t = i / 14
-    y = interpolate(0, 350, t, 'ease_in')
-    draw_emoji_enhanced(frame, '⚽', position=(220, int(y)), size=80)
-    builder.add_frame(frame)
-
-# Phase 2: Impact + flash
-for i in range(8):
-    frame = create_gradient_background(480, 480, (240, 248, 255), (200, 230, 255))
-
-    # Flash on first frames
-    if i < 3:
-        frame = create_impact_flash(frame, (240, 350), radius=120, intensity=0.6)
-
-    draw_emoji_enhanced(frame, '⚽', position=(220, 350), size=80)
-
-    # Text appears
-    if i > 2:
-        draw_text_with_outline(frame, "GOAL!", position=(240, 150),
-                              font_size=60, text_color=(255, 68, 68),
-                              outline_color=(0, 0, 0), outline_width=4, centered=True)
-
-    builder.add_frame(frame)
-
-builder.save('goal.gif', num_colors=128)
-```
-
-### Combining Primitives (Move + Shake)
-```python
-from templates.shake import create_shake_animation
-
-# Create shake animation
-shake_frames = create_shake_animation(
-    object_type='emoji',
-    object_data={'emoji': '😰', 'size': 70},
-    num_frames=20,
-    shake_intensity=12
+# Maximum optimization for emoji
+builder.save(
+    'emoji.gif',
+    num_colors=48,
+    optimize_for_emoji=True,
+    remove_duplicates=True
 )
-
-# Create moving element that triggers the shake
-builder = GIFBuilder(480, 480, 20)
-for i in range(40):
-    t = i / 39
-
-    if i < 20:
-        # Before trigger - use blank frame with moving object
-        frame = create_blank_frame(480, 480, (255, 255, 255))
-        x = interpolate(50, 300, t * 2, 'linear')
-        draw_emoji_enhanced(frame, '🚗', position=(int(x), 300), size=60)
-        draw_emoji_enhanced(frame, '😰', position=(350, 200), size=70)
-    else:
-        # After trigger - use shake frame
-        frame = shake_frames[i - 20]
-        # Add the car in final position
-        draw_emoji_enhanced(frame, '🚗', position=(300, 300), size=60)
-
-    builder.add_frame(frame)
-
-builder.save('scare.gif')
 ```
 
 ## Philosophy
 
-This toolkit provides building blocks, not rigid recipes. To work with a GIF request:
+This skill provides:
+- **Knowledge**: Slack's requirements and animation concepts
+- **Utilities**: GIFBuilder, validators, easing functions
+- **Flexibility**: Create the animation logic using PIL primitives
 
-1. **Understand the creative vision** - What should happen? What's the mood?
-2. **Design the animation** - Break it into phases (anticipation, action, reaction)
-3. **Apply primitives as needed** - Shake, bounce, move, effects - mix freely
-4. **Validate constraints** - Check file size, especially for emoji GIFs
-5. **Iterate if needed** - Reduce frames/colors if over size limits
+It does NOT provide:
+- Rigid animation templates or pre-made functions
+- Emoji font rendering (unreliable across platforms)
+- A library of pre-packaged graphics built into the skill
 
-**The goal is creative freedom within Slack's technical constraints.**
+**Note on user uploads**: This skill doesn't include pre-built graphics, but if a user uploads an image, use PIL to load and work with it - interpret based on their request whether they want it used directly or just as inspiration.
+
+Be creative! Combine concepts (bouncing + rotating, pulsing + sliding, etc.) and use PIL's full capabilities.
 
 ## Dependencies
 
-To use this toolkit, install these dependencies only if they aren't already present:
-
 ```bash
 pip install pillow imageio numpy
 ```

slack-gif-creator/core/easing.py

@@ -101,25 +101,25 @@ def ease_in_out_elastic(t: float) -> float:
 
 # Convenience mapping
 EASING_FUNCTIONS = {
-    'linear': linear,
-    'ease_in': ease_in_quad,
-    'ease_out': ease_out_quad,
-    'ease_in_out': ease_in_out_quad,
-    'bounce_in': ease_in_bounce,
-    'bounce_out': ease_out_bounce,
-    'bounce': ease_in_out_bounce,
-    'elastic_in': ease_in_elastic,
-    'elastic_out': ease_out_elastic,
-    'elastic': ease_in_out_elastic,
+    "linear": linear,
+    "ease_in": ease_in_quad,
+    "ease_out": ease_out_quad,
+    "ease_in_out": ease_in_out_quad,
+    "bounce_in": ease_in_bounce,
+    "bounce_out": ease_out_bounce,
+    "bounce": ease_in_out_bounce,
+    "elastic_in": ease_in_elastic,
+    "elastic_out": ease_out_elastic,
+    "elastic": ease_in_out_elastic,
 }
 
 
-def get_easing(name: str = 'linear'):
+def get_easing(name: str = "linear"):
     """Get easing function by name."""
     return EASING_FUNCTIONS.get(name, linear)
 
 
-def interpolate(start: float, end: float, t: float, easing: str = 'linear') -> float:
+def interpolate(start: float, end: float, t: float, easing: str = "linear") -> float:
     """
     Interpolate between two values with easing.
 
@@ -160,8 +160,9 @@ def ease_back_in_out(t: float) -> float:
     return (pow(2 * t - 2, 2) * ((c2 + 1) * (t * 2 - 2) + c2) + 2) / 2
 
 
-def apply_squash_stretch(base_scale: tuple[float, float], intensity: float,
-                         direction: str = 'vertical') -> tuple[float, float]:
+def apply_squash_stretch(
+    base_scale: tuple[float, float], intensity: float, direction: str = "vertical"
+) -> tuple[float, float]:
     """
     Calculate squash and stretch scales for more dynamic animation.
 
@@ -175,24 +176,25 @@ def apply_squash_stretch(base_scale: tuple[float, float], intensity: float,
     """
     width_scale, height_scale = base_scale
 
-    if direction == 'vertical':
+    if direction == "vertical":
         # Compress vertically, expand horizontally (preserve volume)
-        height_scale *= (1 - intensity * 0.5)
-        width_scale *= (1 + intensity * 0.5)
-    elif direction == 'horizontal':
+        height_scale *= 1 - intensity * 0.5
+        width_scale *= 1 + intensity * 0.5
+    elif direction == "horizontal":
         # Compress horizontally, expand vertically
-        width_scale *= (1 - intensity * 0.5)
-        height_scale *= (1 + intensity * 0.5)
-    elif direction == 'both':
+        width_scale *= 1 - intensity * 0.5
+        height_scale *= 1 + intensity * 0.5
+    elif direction == "both":
         # General squash (both dimensions)
-        width_scale *= (1 - intensity * 0.3)
-        height_scale *= (1 - intensity * 0.3)
+        width_scale *= 1 - intensity * 0.3
+        height_scale *= 1 - intensity * 0.3
 
     return (width_scale, height_scale)
 
 
-def calculate_arc_motion(start: tuple[float, float], end: tuple[float, float],
-                        height: float, t: float) -> tuple[float, float]:
+def calculate_arc_motion(
+    start: tuple[float, float], end: tuple[float, float], height: float, t: float
+) -> tuple[float, float]:
     """
     Calculate position along a parabolic arc (natural motion path).
 
@@ -221,10 +223,12 @@ def calculate_arc_motion(start: tuple[float, float], end: tuple[float, float],
 
 
 # Add new easing functions to the convenience mapping
-EASING_FUNCTIONS.update({
-    'back_in': ease_back_in,
-    'back_out': ease_back_out,
-    'back_in_out': ease_back_in_out,
-    'anticipate': ease_back_in,     # Alias
-    'overshoot': ease_back_out,     # Alias
-})
+EASING_FUNCTIONS.update(
+    {
+        "back_in": ease_back_in,
+        "back_out": ease_back_out,
+        "back_in_out": ease_back_in_out,
+        "anticipate": ease_back_in,  # Alias
+        "overshoot": ease_back_out,  # Alias
+    }
+)

slack-gif-creator/core/frame_composer.py

@@ -6,12 +6,15 @@ Provides functions for drawing shapes, text, emojis, and compositing elements
 together to create animation frames.
 """
 
-from PIL import Image, ImageDraw, ImageFont
-import numpy as np
 from typing import Optional
 
+import numpy as np
+from PIL import Image, ImageDraw, ImageFont
 
-def create_blank_frame(width: int, height: int, color: tuple[int, int, int] = (255, 255, 255)) -> Image.Image:
+
+def create_blank_frame(
+    width: int, height: int, color: tuple[int, int, int] = (255, 255, 255)
+) -> Image.Image:
     """
     Create a blank frame with solid color background.
 
@@ -23,13 +26,17 @@ def create_blank_frame(width: int, height: int, color: tuple[int, int, int] = (2
     Returns:
         PIL Image
     """
-    return Image.new('RGB', (width, height), color)
+    return Image.new("RGB", (width, height), color)
 
 
-def draw_circle(frame: Image.Image, center: tuple[int, int], radius: int,
-                fill_color: Optional[tuple[int, int, int]] = None,
-                outline_color: Optional[tuple[int, int, int]] = None,
-                outline_width: int = 1) -> Image.Image:
+def draw_circle(
+    frame: Image.Image,
+    center: tuple[int, int],
+    radius: int,
+    fill_color: Optional[tuple[int, int, int]] = None,
+    outline_color: Optional[tuple[int, int, int]] = None,
+    outline_width: int = 1,
+) -> Image.Image:
     """
     Draw a circle on a frame.
 
@@ -51,52 +58,13 @@ def draw_circle(frame: Image.Image, center: tuple[int, int], radius: int,
     return frame
 
 
-def draw_rectangle(frame: Image.Image, top_left: tuple[int, int], bottom_right: tuple[int, int],
-                   fill_color: Optional[tuple[int, int, int]] = None,
-                   outline_color: Optional[tuple[int, int, int]] = None,
-                   outline_width: int = 1) -> Image.Image:
-    """
-    Draw a rectangle on a frame.
-
-    Args:
-        frame: PIL Image to draw on
-        top_left: (x, y) top-left corner
-        bottom_right: (x, y) bottom-right corner
-        fill_color: RGB fill color (None for no fill)
-        outline_color: RGB outline color (None for no outline)
-        outline_width: Outline width in pixels
-
-    Returns:
-        Modified frame
-    """
-    draw = ImageDraw.Draw(frame)
-    draw.rectangle([top_left, bottom_right], fill=fill_color, outline=outline_color, width=outline_width)
-    return frame
-
-
-def draw_line(frame: Image.Image, start: tuple[int, int], end: tuple[int, int],
-              color: tuple[int, int, int] = (0, 0, 0), width: int = 2) -> Image.Image:
-    """
-    Draw a line on a frame.
-
-    Args:
-        frame: PIL Image to draw on
-        start: (x, y) start position
-        end: (x, y) end position
-        color: RGB line color
-        width: Line width in pixels
-
-    Returns:
-        Modified frame
-    """
-    draw = ImageDraw.Draw(frame)
-    draw.line([start, end], fill=color, width=width)
-    return frame
-
-
-def draw_text(frame: Image.Image, text: str, position: tuple[int, int],
-              font_size: int = 40, color: tuple[int, int, int] = (0, 0, 0),
-              centered: bool = False) -> Image.Image:
+def draw_text(
+    frame: Image.Image,
+    text: str,
+    position: tuple[int, int],
+    color: tuple[int, int, int] = (0, 0, 0),
+    centered: bool = False,
+) -> Image.Image:
     """
     Draw text on a frame.
 
@@ -104,7 +72,6 @@ def draw_text(frame: Image.Image, text: str, position: tuple[int, int],
         frame: PIL Image to draw on
         text: Text to draw
         position: (x, y) position (top-left unless centered=True)
-        font_size: Font size in pixels
         color: RGB text color
         centered: If True, center text at position
 
@@ -113,11 +80,9 @@ def draw_text(frame: Image.Image, text: str, position: tuple[int, int],
     """
     draw = ImageDraw.Draw(frame)
 
-    # Try to use default font, fall back to basic if not available
-    try:
-        font = ImageFont.truetype("/System/Library/Fonts/Helvetica.ttc", font_size)
-    except:
-        font = ImageFont.load_default()
+    # Uses Pillow's default font.
+    # If the font should be changed for the emoji, add additional logic here.
+    font = ImageFont.load_default()
 
     if centered:
         bbox = draw.textbbox((0, 0), text, font=font)
@@ -131,110 +96,12 @@ def draw_text(frame: Image.Image, text: str, position: tuple[int, int],
     return frame
 
 
-def draw_emoji(frame: Image.Image, emoji: str, position: tuple[int, int], size: int = 60) -> Image.Image:
-    """
-    Draw emoji text on a frame (requires system emoji support).
-
-    Args:
-        frame: PIL Image to draw on
-        emoji: Emoji character(s)
-        position: (x, y) position
-        size: Emoji size in pixels
-
-    Returns:
-        Modified frame
-    """
-    draw = ImageDraw.Draw(frame)
-
-    # Use Apple Color Emoji font on macOS
-    try:
-        font = ImageFont.truetype("/System/Library/Fonts/Apple Color Emoji.ttc", size)
-    except:
-        # Fallback to text-based emoji
-        font = ImageFont.truetype("/System/Library/Fonts/Helvetica.ttc", size)
-
-    draw.text(position, emoji, font=font, embedded_color=True)
-    return frame
-
-
-def composite_layers(base: Image.Image, overlay: Image.Image,
-                     position: tuple[int, int] = (0, 0), alpha: float = 1.0) -> Image.Image:
-    """
-    Composite one image on top of another.
-
-    Args:
-        base: Base image
-        overlay: Image to overlay on top
-        position: (x, y) position to place overlay
-        alpha: Opacity of overlay (0.0 = transparent, 1.0 = opaque)
-
-    Returns:
-        Composite image
-    """
-    # Convert to RGBA for transparency support
-    base_rgba = base.convert('RGBA')
-    overlay_rgba = overlay.convert('RGBA')
-
-    # Apply alpha
-    if alpha < 1.0:
-        overlay_rgba = overlay_rgba.copy()
-        overlay_rgba.putalpha(int(255 * alpha))
-
-    # Paste overlay onto base
-    base_rgba.paste(overlay_rgba, position, overlay_rgba)
-
-    # Convert back to RGB
-    return base_rgba.convert('RGB')
-
-
-def draw_stick_figure(frame: Image.Image, position: tuple[int, int], scale: float = 1.0,
-                      color: tuple[int, int, int] = (0, 0, 0), line_width: int = 3) -> Image.Image:
-    """
-    Draw a simple stick figure.
-
-    Args:
-        frame: PIL Image to draw on
-        position: (x, y) center position of head
-        scale: Size multiplier
-        color: RGB line color
-        line_width: Line width in pixels
-
-    Returns:
-        Modified frame
-    """
-    draw = ImageDraw.Draw(frame)
-    x, y = position
-
-    # Scale dimensions
-    head_radius = int(15 * scale)
-    body_length = int(40 * scale)
-    arm_length = int(25 * scale)
-    leg_length = int(35 * scale)
-    leg_spread = int(15 * scale)
-
-    # Head
-    draw.ellipse([x - head_radius, y - head_radius, x + head_radius, y + head_radius],
-                 outline=color, width=line_width)
-
-    # Body
-    body_start = y + head_radius
-    body_end = body_start + body_length
-    draw.line([(x, body_start), (x, body_end)], fill=color, width=line_width)
-
-    # Arms
-    arm_y = body_start + int(body_length * 0.3)
-    draw.line([(x - arm_length, arm_y), (x + arm_length, arm_y)], fill=color, width=line_width)
-
-    # Legs
-    draw.line([(x, body_end), (x - leg_spread, body_end + leg_length)], fill=color, width=line_width)
-    draw.line([(x, body_end), (x + leg_spread, body_end + leg_length)], fill=color, width=line_width)
-
-    return frame
-
-
-def create_gradient_background(width: int, height: int,
-                               top_color: tuple[int, int, int],
-                               bottom_color: tuple[int, int, int]) -> Image.Image:
+def create_gradient_background(
+    width: int,
+    height: int,
+    top_color: tuple[int, int, int],
+    bottom_color: tuple[int, int, int],
+) -> Image.Image:
     """
     Create a vertical gradient background.
 
@@ -247,7 +114,7 @@ def create_gradient_background(width: int, height: int,
     Returns:
         PIL Image with gradient
     """
-    frame = Image.new('RGB', (width, height))
+    frame = Image.new("RGB", (width, height))
     draw = ImageDraw.Draw(frame)
 
     # Calculate color step for each row
@@ -267,175 +134,14 @@ def create_gradient_background(width: int, height: int,
     return frame
 
 
-def draw_emoji_enhanced(frame: Image.Image, emoji: str, position: tuple[int, int],
-                       size: int = 60, shadow: bool = True,
-                       shadow_offset: tuple[int, int] = (2, 2)) -> Image.Image:
-    """
-    Draw emoji with optional shadow for better visual quality.
-
-    Args:
-        frame: PIL Image to draw on
-        emoji: Emoji character(s)
-        position: (x, y) position
-        size: Emoji size in pixels (minimum 12)
-        shadow: Whether to add drop shadow
-        shadow_offset: Shadow offset
-
-    Returns:
-        Modified frame
-    """
-    draw = ImageDraw.Draw(frame)
-
-    # Ensure minimum size to avoid font rendering errors
-    size = max(12, size)
-
-    # Use Apple Color Emoji font on macOS
-    try:
-        font = ImageFont.truetype("/System/Library/Fonts/Apple Color Emoji.ttc", size)
-    except:
-        # Fallback to text-based emoji
-        try:
-            font = ImageFont.truetype("/System/Library/Fonts/Helvetica.ttc", size)
-        except:
-            font = ImageFont.load_default()
-
-    # Draw shadow first if enabled
-    if shadow and size >= 20:  # Only draw shadow for larger emojis
-        shadow_pos = (position[0] + shadow_offset[0], position[1] + shadow_offset[1])
-        # Draw semi-transparent shadow (simulated by drawing multiple times)
-        for offset in range(1, 3):
-            try:
-                draw.text((shadow_pos[0] + offset, shadow_pos[1] + offset),
-                         emoji, font=font, embedded_color=True, fill=(0, 0, 0, 100))
-            except:
-                pass  # Skip shadow if it fails
-
-    # Draw main emoji
-    try:
-        draw.text(position, emoji, font=font, embedded_color=True)
-    except:
-        # Fallback to basic drawing if embedded color fails
-        draw.text(position, emoji, font=font, fill=(0, 0, 0))
-
-    return frame
-
-
-def draw_circle_with_shadow(frame: Image.Image, center: tuple[int, int], radius: int,
-                            fill_color: tuple[int, int, int],
-                            shadow_offset: tuple[int, int] = (3, 3),
-                            shadow_color: tuple[int, int, int] = (0, 0, 0)) -> Image.Image:
-    """
-    Draw a circle with drop shadow.
-
-    Args:
-        frame: PIL Image to draw on
-        center: (x, y) center position
-        radius: Circle radius
-        fill_color: RGB fill color
-        shadow_offset: (x, y) shadow offset
-        shadow_color: RGB shadow color
-
-    Returns:
-        Modified frame
-    """
-    draw = ImageDraw.Draw(frame)
-    x, y = center
-
-    # Draw shadow
-    shadow_center = (x + shadow_offset[0], y + shadow_offset[1])
-    shadow_bbox = [
-        shadow_center[0] - radius,
-        shadow_center[1] - radius,
-        shadow_center[0] + radius,
-        shadow_center[1] + radius
-    ]
-    draw.ellipse(shadow_bbox, fill=shadow_color)
-
-    # Draw main circle
-    bbox = [x - radius, y - radius, x + radius, y + radius]
-    draw.ellipse(bbox, fill=fill_color)
-
-    return frame
-
-
-def draw_rounded_rectangle(frame: Image.Image, top_left: tuple[int, int],
-                          bottom_right: tuple[int, int], radius: int,
-                          fill_color: Optional[tuple[int, int, int]] = None,
-                          outline_color: Optional[tuple[int, int, int]] = None,
-                          outline_width: int = 1) -> Image.Image:
-    """
-    Draw a rectangle with rounded corners.
-
-    Args:
-        frame: PIL Image to draw on
-        top_left: (x, y) top-left corner
-        bottom_right: (x, y) bottom-right corner
-        radius: Corner radius
-        fill_color: RGB fill color (None for no fill)
-        outline_color: RGB outline color (None for no outline)
-        outline_width: Outline width
-
-    Returns:
-        Modified frame
-    """
-    draw = ImageDraw.Draw(frame)
-    x1, y1 = top_left
-    x2, y2 = bottom_right
-
-    # Draw rounded rectangle using PIL's built-in method
-    draw.rounded_rectangle([x1, y1, x2, y2], radius=radius,
-                          fill=fill_color, outline=outline_color, width=outline_width)
-
-    return frame
-
-
-def add_vignette(frame: Image.Image, strength: float = 0.5) -> Image.Image:
-    """
-    Add a vignette effect (darkened edges) to frame.
-
-    Args:
-        frame: PIL Image
-        strength: Vignette strength (0.0-1.0)
-
-    Returns:
-        Frame with vignette
-    """
-    width, height = frame.size
-
-    # Create radial gradient mask
-    center_x, center_y = width // 2, height // 2
-    max_dist = ((width / 2) ** 2 + (height / 2) ** 2) ** 0.5
-
-    # Create overlay
-    overlay = Image.new('RGB', (width, height), (0, 0, 0))
-    pixels = overlay.load()
-
-    for y in range(height):
-        for x in range(width):
-            # Calculate distance from center
-            dx = x - center_x
-            dy = y - center_y
-            dist = (dx ** 2 + dy ** 2) ** 0.5
-
-            # Calculate vignette value
-            vignette = min(1, (dist / max_dist) * strength)
-            value = int(255 * (1 - vignette))
-            pixels[x, y] = (value, value, value)
-
-    # Blend with original using multiply
-    frame_array = np.array(frame, dtype=np.float32) / 255
-    overlay_array = np.array(overlay, dtype=np.float32) / 255
-
-    result = frame_array * overlay_array
-    result = (result * 255).astype(np.uint8)
-
-    return Image.fromarray(result)
-
-
-def draw_star(frame: Image.Image, center: tuple[int, int], size: int,
-             fill_color: tuple[int, int, int],
-             outline_color: Optional[tuple[int, int, int]] = None,
-             outline_width: int = 1) -> Image.Image:
+def draw_star(
+    frame: Image.Image,
+    center: tuple[int, int],
+    size: int,
+    fill_color: tuple[int, int, int],
+    outline_color: Optional[tuple[int, int, int]] = None,
+    outline_width: int = 1,
+) -> Image.Image:
     """
     Draw a 5-pointed star.
 
@@ -451,6 +157,7 @@ def draw_star(frame: Image.Image, center: tuple[int, int], size: int,
         Modified frame
     """
     import math
+
     draw = ImageDraw.Draw(frame)
     x, y = center
 
@@ -466,4 +173,4 @@ def draw_star(frame: Image.Image, center: tuple[int, int], size: int,
     # Draw star
     draw.polygon(points, fill=fill_color, outline=outline_color, width=outline_width)
 
-    return frame
+    return frame

slack-gif-creator/core/gif_builder.py

@@ -8,9 +8,10 @@ generated frames, with automatic optimization for Slack's requirements.
 
 from pathlib import Path
 from typing import Optional
+
 import imageio.v3 as imageio
-from PIL import Image
 import numpy as np
+from PIL import Image
 
 
 class GIFBuilder:
@@ -38,12 +39,14 @@ class GIFBuilder:
             frame: Frame as numpy array or PIL Image (will be converted to RGB)
         """
         if isinstance(frame, Image.Image):
-            frame = np.array(frame.convert('RGB'))
+            frame = np.array(frame.convert("RGB"))
 
         # Ensure frame is correct size
         if frame.shape[:2] != (self.height, self.width):
             pil_frame = Image.fromarray(frame)
-            pil_frame = pil_frame.resize((self.width, self.height), Image.Resampling.LANCZOS)
+            pil_frame = pil_frame.resize(
+                (self.width, self.height), Image.Resampling.LANCZOS
+            )
             frame = np.array(pil_frame)
 
         self.frames.append(frame)
@@ -53,7 +56,9 @@ class GIFBuilder:
         for frame in frames:
             self.add_frame(frame)
 
-    def optimize_colors(self, num_colors: int = 128, use_global_palette: bool = True) -> list[np.ndarray]:
+    def optimize_colors(
+        self, num_colors: int = 128, use_global_palette: bool = True
+    ) -> list[np.ndarray]:
         """
         Reduce colors in all frames using quantization.
 
@@ -70,12 +75,16 @@ class GIFBuilder:
             # Create a global palette from all frames
             # Sample frames to build palette
             sample_size = min(5, len(self.frames))
-            sample_indices = [int(i * len(self.frames) / sample_size) for i in range(sample_size)]
+            sample_indices = [
+                int(i * len(self.frames) / sample_size) for i in range(sample_size)
+            ]
             sample_frames = [self.frames[i] for i in sample_indices]
 
             # Combine sample frames into a single image for palette generation
             # Flatten each frame to get all pixels, then stack them
-            all_pixels = np.vstack([f.reshape(-1, 3) for f in sample_frames])  # (total_pixels, 3)
+            all_pixels = np.vstack(
+                [f.reshape(-1, 3) for f in sample_frames]
+            )  # (total_pixels, 3)
 
             # Create a properly-shaped RGB image from the pixel data
             # We'll make a roughly square image from all the pixels
@@ -90,8 +99,10 @@ class GIFBuilder:
                 all_pixels = np.vstack([all_pixels, padding])
 
             # Reshape to proper RGB image format (H, W, 3)
-            img_array = all_pixels[:pixels_needed].reshape(height, width, 3).astype(np.uint8)
-            combined_img = Image.fromarray(img_array, mode='RGB')
+            img_array = (
+                all_pixels[:pixels_needed].reshape(height, width, 3).astype(np.uint8)
+            )
+            combined_img = Image.fromarray(img_array, mode="RGB")
 
             # Generate global palette
             global_palette = combined_img.quantize(colors=num_colors, method=2)
@@ -100,22 +111,23 @@ class GIFBuilder:
             for frame in self.frames:
                 pil_frame = Image.fromarray(frame)
                 quantized = pil_frame.quantize(palette=global_palette, dither=1)
-                optimized.append(np.array(quantized.convert('RGB')))
+                optimized.append(np.array(quantized.convert("RGB")))
         else:
             # Use per-frame quantization
             for frame in self.frames:
                 pil_frame = Image.fromarray(frame)
                 quantized = pil_frame.quantize(colors=num_colors, method=2, dither=1)
-                optimized.append(np.array(quantized.convert('RGB')))
+                optimized.append(np.array(quantized.convert("RGB")))
 
         return optimized
 
-    def deduplicate_frames(self, threshold: float = 0.995) -> int:
+    def deduplicate_frames(self, threshold: float = 0.9995) -> int:
         """
         Remove duplicate or near-duplicate consecutive frames.
 
         Args:
-            threshold: Similarity threshold (0.0-1.0). Higher = more strict (0.995 = very similar).
+            threshold: Similarity threshold (0.0-1.0). Higher = more strict (0.9995 = nearly identical).
+                      Use 0.9995+ to preserve subtle animations, 0.98 for aggressive removal.
 
         Returns:
             Number of frames removed
@@ -136,7 +148,7 @@ class GIFBuilder:
             similarity = 1.0 - (np.mean(diff) / 255.0)
 
             # Keep frame if sufficiently different
-            # High threshold (0.995) means only remove truly identical frames
+            # High threshold (0.9995+) means only remove nearly identical frames
             if similarity < threshold:
                 deduplicated.append(self.frames[i])
             else:
@@ -145,16 +157,21 @@ class GIFBuilder:
         self.frames = deduplicated
         return removed_count
 
-    def save(self, output_path: str | Path, num_colors: int = 128,
-             optimize_for_emoji: bool = False, remove_duplicates: bool = True) -> dict:
+    def save(
+        self,
+        output_path: str | Path,
+        num_colors: int = 128,
+        optimize_for_emoji: bool = False,
+        remove_duplicates: bool = False,
+    ) -> dict:
         """
         Save frames as optimized GIF for Slack.
 
         Args:
             output_path: Where to save the GIF
             num_colors: Number of colors to use (fewer = smaller file)
-            optimize_for_emoji: If True, optimize for <64KB emoji size
-            remove_duplicates: Remove duplicate consecutive frames
+            optimize_for_emoji: If True, optimize for emoji size (128x128, fewer colors)
+            remove_duplicates: If True, remove duplicate consecutive frames (opt-in)
 
         Returns:
             Dictionary with file info (path, size, dimensions, frame_count)
@@ -163,18 +180,21 @@ class GIFBuilder:
             raise ValueError("No frames to save. Add frames with add_frame() first.")
 
         output_path = Path(output_path)
-        original_frame_count = len(self.frames)
 
         # Remove duplicate frames to reduce file size
         if remove_duplicates:
-            removed = self.deduplicate_frames(threshold=0.98)
+            removed = self.deduplicate_frames(threshold=0.9995)
             if removed > 0:
-                print(f"  Removed {removed} duplicate frames")
+                print(
+                    f"  Removed {removed} nearly identical frames (preserved subtle animations)"
+                )
 
         # Optimize for emoji if requested
         if optimize_for_emoji:
             if self.width > 128 or self.height > 128:
-                print(f"  Resizing from {self.width}x{self.height} to 128x128 for emoji")
+                print(
+                    f"  Resizing from {self.width}x{self.height} to 128x128 for emoji"
+                )
                 self.width = 128
                 self.height = 128
                 # Resize all frames
@@ -188,10 +208,14 @@ class GIFBuilder:
 
             # More aggressive FPS reduction for emoji
             if len(self.frames) > 12:
-                print(f"  Reducing frames from {len(self.frames)} to ~12 for emoji size")
+                print(
+                    f"  Reducing frames from {len(self.frames)} to ~12 for emoji size"
+                )
                 # Keep every nth frame to get close to 12 frames
                 keep_every = max(1, len(self.frames) // 12)
-                self.frames = [self.frames[i] for i in range(0, len(self.frames), keep_every)]
+                self.frames = [
+                    self.frames[i] for i in range(0, len(self.frames), keep_every)
+                ]
 
         # Optimize colors with global palette
         optimized_frames = self.optimize_colors(num_colors, use_global_palette=True)
@@ -204,7 +228,7 @@ class GIFBuilder:
             output_path,
             optimized_frames,
             duration=frame_duration,
-            loop=0  # Infinite loop
+            loop=0,  # Infinite loop
         )
 
         # Get file info
@@ -212,14 +236,14 @@ class GIFBuilder:
         file_size_mb = file_size_kb / 1024
 
         info = {
-            'path': str(output_path),
-            'size_kb': file_size_kb,
-            'size_mb': file_size_mb,
-            'dimensions': f'{self.width}x{self.height}',
-            'frame_count': len(optimized_frames),
-            'fps': self.fps,
-            'duration_seconds': len(optimized_frames) / self.fps,
-            'colors': num_colors
+            "path": str(output_path),
+            "size_kb": file_size_kb,
+            "size_mb": file_size_mb,
+            "dimensions": f"{self.width}x{self.height}",
+            "frame_count": len(optimized_frames),
+            "fps": self.fps,
+            "duration_seconds": len(optimized_frames) / self.fps,
+            "colors": num_colors,
         }
 
         # Print info
@@ -231,16 +255,15 @@ class GIFBuilder:
         print(f"  Duration: {info['duration_seconds']:.1f}s")
         print(f"  Colors: {num_colors}")
 
-        # Warnings
-        if optimize_for_emoji and file_size_kb > 64:
-            print(f"\n⚠️  WARNING: Emoji file size ({file_size_kb:.1f} KB) exceeds 64 KB limit")
-            print("   Try: fewer frames, fewer colors, or simpler design")
-        elif not optimize_for_emoji and file_size_kb > 2048:
-            print(f"\n⚠️  WARNING: File size ({file_size_kb:.1f} KB) is large for Slack")
-            print("   Try: fewer frames, smaller dimensions, or fewer colors")
+        # Size info
+        if optimize_for_emoji:
+            print(f"  Optimized for emoji (128x128, reduced colors)")
+        if file_size_mb > 1.0:
+            print(f"\n  Note: Large file size ({file_size_kb:.1f} KB)")
+            print("  Consider: fewer frames, smaller dimensions, or fewer colors")
 
         return info
 
     def clear(self):
         """Clear all frames (useful for creating multiple GIFs)."""
-        self.frames = []
+        self.frames = []

slack-gif-creator/core/validators.py

@@ -8,146 +8,36 @@ These validators help ensure your GIFs meet Slack's size and dimension constrain
 from pathlib import Path
 
 
-def check_slack_size(gif_path: str | Path, is_emoji: bool = True) -> tuple[bool, dict]:
+def validate_gif(
+    gif_path: str | Path, is_emoji: bool = True, verbose: bool = True
+) -> tuple[bool, dict]:
     """
-    Check if GIF meets Slack size limits.
+    Validate GIF for Slack (dimensions, size, frame count).
 
     Args:
         gif_path: Path to GIF file
-        is_emoji: True for emoji GIF (64KB limit), False for message GIF (2MB limit)
+        is_emoji: True for emoji (128x128 recommended), False for message GIF
+        verbose: Print validation details
 
     Returns:
-        Tuple of (passes: bool, info: dict with details)
-    """
-    gif_path = Path(gif_path)
-
-    if not gif_path.exists():
-        return False, {'error': f'File not found: {gif_path}'}
-
-    size_bytes = gif_path.stat().st_size
-    size_kb = size_bytes / 1024
-    size_mb = size_kb / 1024
-
-    limit_kb = 64 if is_emoji else 2048
-    limit_mb = limit_kb / 1024
-
-    passes = size_kb <= limit_kb
-
-    info = {
-        'size_bytes': size_bytes,
-        'size_kb': size_kb,
-        'size_mb': size_mb,
-        'limit_kb': limit_kb,
-        'limit_mb': limit_mb,
-        'passes': passes,
-        'type': 'emoji' if is_emoji else 'message'
-    }
-
-    # Print feedback
-    if passes:
-        print(f"✓ {size_kb:.1f} KB - within {limit_kb} KB limit")
-    else:
-        print(f"✗ {size_kb:.1f} KB - exceeds {limit_kb} KB limit")
-        overage_kb = size_kb - limit_kb
-        overage_percent = (overage_kb / limit_kb) * 100
-        print(f"  Over by: {overage_kb:.1f} KB ({overage_percent:.1f}%)")
-        print(f"  Try: fewer frames, fewer colors, or simpler design")
-
-    return passes, info
-
-
-def validate_dimensions(width: int, height: int, is_emoji: bool = True) -> tuple[bool, dict]:
-    """
-    Check if dimensions are suitable for Slack.
-
-    Args:
-        width: Frame width in pixels
-        height: Frame height in pixels
-        is_emoji: True for emoji GIF, False for message GIF
-
-    Returns:
-        Tuple of (passes: bool, info: dict with details)
-    """
-    info = {
-        'width': width,
-        'height': height,
-        'is_square': width == height,
-        'type': 'emoji' if is_emoji else 'message'
-    }
-
-    if is_emoji:
-        # Emoji GIFs should be 128x128
-        optimal = width == height == 128
-        acceptable = width == height and 64 <= width <= 128
-
-        info['optimal'] = optimal
-        info['acceptable'] = acceptable
-
-        if optimal:
-            print(f"✓ {width}x{height} - optimal for emoji")
-            passes = True
-        elif acceptable:
-            print(f"⚠ {width}x{height} - acceptable but 128x128 is optimal")
-            passes = True
-        else:
-            print(f"✗ {width}x{height} - emoji should be square, 128x128 recommended")
-            passes = False
-    else:
-        # Message GIFs should be square-ish and reasonable size
-        aspect_ratio = max(width, height) / min(width, height) if min(width, height) > 0 else float('inf')
-        reasonable_size = 320 <= min(width, height) <= 640
-
-        info['aspect_ratio'] = aspect_ratio
-        info['reasonable_size'] = reasonable_size
-
-        # Check if roughly square (within 2:1 ratio)
-        is_square_ish = aspect_ratio <= 2.0
-
-        if is_square_ish and reasonable_size:
-            print(f"✓ {width}x{height} - good for message GIF")
-            passes = True
-        elif is_square_ish:
-            print(f"⚠ {width}x{height} - square-ish but unusual size")
-            passes = True
-        elif reasonable_size:
-            print(f"⚠ {width}x{height} - good size but not square-ish")
-            passes = True
-        else:
-            print(f"✗ {width}x{height} - unusual dimensions for Slack")
-            passes = False
-
-    return passes, info
-
-
-def validate_gif(gif_path: str | Path, is_emoji: bool = True) -> tuple[bool, dict]:
-    """
-    Run all validations on a GIF file.
-
-    Args:
-        gif_path: Path to GIF file
-        is_emoji: True for emoji GIF, False for message GIF
-
-    Returns:
-        Tuple of (all_pass: bool, results: dict)
+        Tuple of (passes: bool, results: dict with all details)
     """
     from PIL import Image
 
     gif_path = Path(gif_path)
 
     if not gif_path.exists():
-        return False, {'error': f'File not found: {gif_path}'}
+        return False, {"error": f"File not found: {gif_path}"}
 
-    print(f"\nValidating {gif_path.name} as {'emoji' if is_emoji else 'message'} GIF:")
-    print("=" * 60)
+    # Get file size
+    size_bytes = gif_path.stat().st_size
+    size_kb = size_bytes / 1024
+    size_mb = size_kb / 1024
 
-    # Check file size
-    size_pass, size_info = check_slack_size(gif_path, is_emoji)
-
-    # Check dimensions
+    # Get dimensions and frame info
     try:
         with Image.open(gif_path) as img:
             width, height = img.size
-            dim_pass, dim_info = validate_dimensions(width, height, is_emoji)
 
             # Count frames
             frame_count = 0
@@ -158,107 +48,89 @@ def validate_gif(gif_path: str | Path, is_emoji: bool = True) -> tuple[bool, dic
             except EOFError:
                 pass
 
-            # Get duration if available
+            # Get duration
             try:
-                duration_ms = img.info.get('duration', 100)
+                duration_ms = img.info.get("duration", 100)
                 total_duration = (duration_ms * frame_count) / 1000
                 fps = frame_count / total_duration if total_duration > 0 else 0
             except:
-                duration_ms = None
                 total_duration = None
                 fps = None
 
     except Exception as e:
-        return False, {'error': f'Failed to read GIF: {e}'}
+        return False, {"error": f"Failed to read GIF: {e}"}
 
-    print(f"\nFrames: {frame_count}")
-    if total_duration:
-        print(f"Duration: {total_duration:.1f}s @ {fps:.1f} fps")
-
-    all_pass = size_pass and dim_pass
+    # Validate dimensions
+    if is_emoji:
+        optimal = width == height == 128
+        acceptable = width == height and 64 <= width <= 128
+        dim_pass = acceptable
+    else:
+        aspect_ratio = (
+            max(width, height) / min(width, height)
+            if min(width, height) > 0
+            else float("inf")
+        )
+        dim_pass = aspect_ratio <= 2.0 and 320 <= min(width, height) <= 640
 
     results = {
-        'file': str(gif_path),
-        'passes': all_pass,
-        'size': size_info,
-        'dimensions': dim_info,
-        'frame_count': frame_count,
-        'duration_seconds': total_duration,
-        'fps': fps
+        "file": str(gif_path),
+        "passes": dim_pass,
+        "width": width,
+        "height": height,
+        "size_kb": size_kb,
+        "size_mb": size_mb,
+        "frame_count": frame_count,
+        "duration_seconds": total_duration,
+        "fps": fps,
+        "is_emoji": is_emoji,
+        "optimal": optimal if is_emoji else None,
     }
 
-    print("=" * 60)
-    if all_pass:
-        print("✓ All validations passed!")
-    else:
-        print("✗ Some validations failed")
-    print()
+    # Print if verbose
+    if verbose:
+        print(f"\nValidating {gif_path.name}:")
+        print(
+            f"  Dimensions: {width}x{height}"
+            + (
+                f" ({'optimal' if optimal else 'acceptable'})"
+                if is_emoji and acceptable
+                else ""
+            )
+        )
+        print(
+            f"  Size: {size_kb:.1f} KB"
+            + (f" ({size_mb:.2f} MB)" if size_mb >= 1.0 else "")
+        )
+        print(
+            f"  Frames: {frame_count}"
+            + (f" @ {fps:.1f} fps ({total_duration:.1f}s)" if fps else "")
+        )
 
-    return all_pass, results
+        if not dim_pass:
+            print(
+                f"  Note: {'Emoji should be 128x128' if is_emoji else 'Unusual dimensions for Slack'}"
+            )
+
+        if size_mb > 5.0:
+            print(f"  Note: Large file size - consider fewer frames/colors")
+
+    return dim_pass, results
 
 
-def get_optimization_suggestions(results: dict) -> list[str]:
-    """
-    Get suggestions for optimizing a GIF based on validation results.
-
-    Args:
-        results: Results dict from validate_gif()
-
-    Returns:
-        List of suggestion strings
-    """
-    suggestions = []
-
-    if not results.get('passes', False):
-        size_info = results.get('size', {})
-        dim_info = results.get('dimensions', {})
-
-        # Size suggestions
-        if not size_info.get('passes', True):
-            overage = size_info['size_kb'] - size_info['limit_kb']
-            if size_info['type'] == 'emoji':
-                suggestions.append(f"Reduce file size by {overage:.1f} KB:")
-                suggestions.append("  - Limit to 10-12 frames")
-                suggestions.append("  - Use 32-40 colors maximum")
-                suggestions.append("  - Remove gradients (solid colors compress better)")
-                suggestions.append("  - Simplify design")
-            else:
-                suggestions.append(f"Reduce file size by {overage:.1f} KB:")
-                suggestions.append("  - Reduce frame count or FPS")
-                suggestions.append("  - Use fewer colors (128 → 64)")
-                suggestions.append("  - Reduce dimensions")
-
-        # Dimension suggestions
-        if not dim_info.get('optimal', True) and dim_info.get('type') == 'emoji':
-            suggestions.append("For optimal emoji GIF:")
-            suggestions.append("  - Use 128x128 dimensions")
-            suggestions.append("  - Ensure square aspect ratio")
-
-    return suggestions
-
-
-# Convenience function for quick checks
-def is_slack_ready(gif_path: str | Path, is_emoji: bool = True, verbose: bool = True) -> bool:
+def is_slack_ready(
+    gif_path: str | Path, is_emoji: bool = True, verbose: bool = True
+) -> bool:
     """
     Quick check if GIF is ready for Slack.
 
     Args:
         gif_path: Path to GIF file
         is_emoji: True for emoji GIF, False for message GIF
-        verbose: Print detailed feedback
+        verbose: Print feedback
 
     Returns:
-        True if ready, False otherwise
+        True if dimensions are acceptable
     """
-    if verbose:
-        passes, results = validate_gif(gif_path, is_emoji)
-        if not passes:
-            suggestions = get_optimization_suggestions(results)
-            if suggestions:
-                print("\nSuggestions:")
-                for suggestion in suggestions:
-                    print(suggestion)
-        return passes
-    else:
-        size_pass, _ = check_slack_size(gif_path, is_emoji)
-        return size_pass
+    passes, _ = validate_gif(gif_path, is_emoji, verbose)
+    return passes