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slack-gif-creator

slack-gif-creator

github.com/alleneee创意与媒体27345 次安装31 周前更新
代码仓库

关于 slack-gif-creator

slack-gif-creator 是用于制作符合 Slack 消息和表情限制的动画 GIF 工具包技能,结合规格验证、可组合动画组件,以及可选的组装和优化辅助工具。

主要功能

  1. 01验证 Slack 文件大小和尺寸
  2. 02组合可复用的动画组件
  3. 03组装并优化 GIF 帧
  4. 04使用文字、配色和效果辅助工具
  5. 05检查表情 GIF 专属限制

适用场景

  1. 01制作 Slack 消息 GIF
  2. 02制作符合大小限制的表情 GIF
  3. 03上传前检查并优化 GIF

安装

复制下面的命令,在终端中运行。

$npx skills add https://github.com/alleneee/skill-agent --skill slack-gif-creator

安装后在 Claude Code 中输入/slack-gif-creator确认已加载。

包含的文件

除 SKILL.md 外,安装时一起下载的参考资料和脚本。

LICENSE.txt
requirements.txt
core/
color_palettes.py
easing.py
frame_composer.py
gif_builder.py
typography.py
validators.py
visual_effects.py
templates/
bounce.py
explode.py
fade.py
flip.py
kaleidoscope.py
morph.py
move.py
pulse.py
shake.py
slide.py
spin.py
wiggle.py
zoom.py

详细介绍

Slack GIF Creator - 灵活工具包

一个用于创建针对 Slack 优化的动画 GIF 的工具包。提供用于检查 Slack 限制的验证器、可组合的动画基元,以及可选的辅助工具。可按需应用这些工具,实现创意构想。

Slack 的要求

Slack 会根据 GIF 的用途设定具体要求:

消息 GIF:

  • 最大大小:约 2MB
  • 最佳尺寸:480x480
  • 常见 FPS:15-20
  • 颜色限制:128-256
  • 时长:2-5s

表情 GIF:

  • 最大大小:64KB(严格限制)
  • 最佳尺寸:128x128
  • 常见 FPS:10-12
  • 颜色限制:32-48
  • 时长:1-2s

表情 GIF 的制作颇具挑战——64KB 的限制非常严格。以下策略有助于控制大小:

  • 总帧数限制在 10-15 帧
  • 最多使用 32-48 种颜色
  • 保持设计简洁
  • 避免渐变
  • 经常验证文件大小

工具包结构

此技能提供三类工具:

  1. 验证器 - 检查 GIF 是否符合 Slack 的要求
  2. 动画基元 - 可组合的运动构建模块(抖动、弹跳、移动、万花筒)
  3. 辅助工具 - 用于常见需求的可选函数(文本、颜色、效果)

如何应用这些工具,完全由你自由决定。

核心验证器

要确保 GIF 符合 Slack 的限制,请使用以下验证器:

from core.gif_builder import GIFBuilder

# After creating your GIF, check if it meets requirements
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)

# The save method automatically warns if file exceeds limits
# info dict contains: size_kb, size_mb, frame_count, duration_seconds

文件大小验证器:

from core.validators import check_slack_size

# Check if GIF meets size limits
passes, info = check_slack_size('emoji.gif', is_emoji=True)
# Returns: (True/False, dict with size details)

尺寸验证器:

from core.validators import validate_dimensions

# Check dimensions
passes, info = validate_dimensions(128, 128, is_emoji=True)
# Returns: (True/False, dict with dimension details)

完整验证:

from core.validators import validate_gif, is_slack_ready

# Run all validations
all_pass, results = validate_gif('emoji.gif', is_emoji=True)

# Or quick check
if is_slack_ready('emoji.gif', is_emoji=True):
    print("Ready to upload!")

动画基元

这些是可组合的运动构建模块。可对任意对象以任意组合方式应用:

抖动
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'
)
弹跳
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
)
旋转
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')
脉动 / 心跳
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)
淡入淡出
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}
)
缩放
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='💥')
爆炸 / 粉碎
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)
摆动 / 抖动
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='🎉')
滑动
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)
翻转
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('👍', '👎')
变形 / 转换
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')
移动效果
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)
万花筒效果
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'

如需自由组合基元,请遵循以下模式:

# 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)

辅助工具

这些是满足常见需求的可选辅助工具。可按需使用、修改或替换为自定义实现。

GIF 构建器(组装与优化)
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)

主要功能:

  • 自动量化颜色
  • 移除重复帧
  • 针对 Slack 限制发出大小警告
  • 表情模式(激进优化)
文本渲染

对于表情等小型 GIF,文本可读性较难保证。常见的解决方法是添加描边:

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
)

如需实现自定义文本渲染,可使用 PIL 的 ImageDraw.text(),它适用于较大的 GIF。

颜色管理

专业美观的 GIF 通常使用协调统一的调色板:

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']

如需直接处理颜色,可使用 RGB 元组——选择适合具体场景的方式即可。

视觉效果

可在强调时刻使用的可选效果:

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])
缓动函数

平滑运动使用缓动,而非线性插值:

from core.easing import interpolate

# Object falling (accelerates)
y = interpolate(start=0, end=400, t=progress, easing='ease_in')

# Object landing (decelerates)
y = interpolate(start=0, end=400, t=progress, 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')

可用的缓动包括:linear、ease_in、ease_out、ease_in_out、bounce_out、elastic_out、back_out(过冲),以及 core/easing.py 中的更多函数。

帧合成

如有需要,可使用以下基础绘图工具:

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
)

# 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)

优化策略

当 GIF 文件过大时:

消息 GIF(>2MB):

  1. 减少帧数(降低 FPS 或缩短时长)
  2. 减少颜色(从 128 种降至 64 种)
  3. 缩小尺寸(从 480x480 降至 320x320)
  4. 启用重复帧移除

表情 GIF(>64KB)——应大幅优化:

  1. 总帧数限制在 10-12 帧
  2. 最多使用 32-40 种颜色
  3. 避免渐变(纯色压缩效果更好)
  4. 简化设计(减少元素)
  5. 在保存方法中使用 optimize_for_emoji=True

组合模式示例

简单反应(脉动)
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)
带冲击效果的动作(弹跳 + 闪光)
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)
组合基元(移动 + 抖动)
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
)

# 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')

理念

这个工具包提供的是构建模块,而非固定配方。处理 GIF 请求时:

  1. 理解创作构想 - 需要发生什么?氛围如何?
  2. 设计动画 - 将其拆分为多个阶段(预备、动作、反应)
  3. 按需应用基本元素 - 抖动、弹跳、移动、特效——自由组合
  4. 验证限制 - 检查文件大小,尤其是表情符号 GIF
  5. 按需迭代 - 如果超出大小限制,则减少帧数或颜色

目标是在 Slack 的技术限制内释放创作自由。

依赖项

使用此工具包前,仅在尚未安装这些依赖项时进行安装:

pip install pillow imageio numpy

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