LINE Sticker Maker — Claude Code Skill

用 AI 設計 LINE 貼圖的完整流程，從概念到上架。 A Claude Code skill for designing LINE sticker sets with AI — from concept to submission-ready files.

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What is this?

This is a Claude Code skill — a structured set of instructions and scripts that guides Claude through the complete LINE sticker creation pipeline:

1. Theme & Planning — Character concept, expression list, set composition
2. Character Design — Style anchor prompt for visual consistency
3. Batch Generation — AI image generation with quality controls
4. Quality Review — Systematic checklist to catch common AI generation issues
5. Post-Processing — Automated background removal, resizing, and formatting
6. Final Verification — Format compliance and submission readiness

Why a Skill?

AI image generation is powerful but unpredictable. Without guardrails, you’ll hit these problems:

This skill encodes hard-won lessons into reusable instructions, so you don’t have to learn them the hard way.

Quick Start

1. Install the Skill

Copy the skill to your Claude Code skills directory:

# Create the skill directory
mkdir -p ~/.claude/skills/line-sticker-maker

# Copy files
cp SKILL.md ~/.claude/skills/line-sticker-maker/
cp -r scripts/ ~/.claude/skills/line-sticker-maker/scripts/

2. Install Dependencies

The post-processing script requires Pillow:

pip install Pillow

3. Use It

In Claude Code, just ask:

幫我設計一組 16 張的 LINE 貼圖，主題是 [你的主題]

or

Design a set of 16 LINE stickers featuring [your character concept]

Claude will automatically invoke the skill and guide you through the full pipeline.

Project Structure

line-sticker-maker-skill/
├── SKILL.md                          # Main skill file (Claude Code reads this)
├── scripts/
│   └── process_stickers.py           # Post-processing: bg removal, resize, format
├── docs/
│   └── pipeline-overview.svg         # Visual pipeline diagram
├── examples/
│   └── sample-planning-table.md      # Example sticker planning table
├── LICENSE
└── README.md

The Post-Processing Script

scripts/process_stickers.py converts raw AI-generated images to LINE-ready format:

# Basic usage
python3 scripts/process_stickers.py \
  --input-dir ./my-stickers \
  --output-dir ./line_format

# With per-sticker padding adjustments
python3 scripts/process_stickers.py \
  --input-dir ./my-stickers \
  --output-dir ./line_format \
  --padding-override "04:55,08:45"

What it does:

• Removes white backgrounds → transparent PNG
• Resizes to 370×320px with centered character and safe margins
• Generates main.png (240×240) and tab.png (96×74)
• Verifies all file sizes are under 1MB

Options:

Key Concept: Style Anchor

The Style Anchor is a fixed prompt prefix shared across all stickers to maintain visual consistency:

[Art style] + [Character description] + [Outfit details] + [Cultural markers] + [Composition rules] + [Technical specs]

Example:

Cute chibi kawaii style LINE sticker, exactly ONE single character
centered in the image, a round-faced boy with big expressive eyes
and rosy cheeks, thick black outline, cartoon style, high contrast
colors, simple clean white background, flat illustration, no shadow

Each sticker only varies the expression, pose, and text — everything else stays identical.

LINE Creators Market Specs

• All images: RGBA PNG, RGB color mode
• Max file size: 1MB per image
• Content must have ≥ 10px margin from edges

Contributing

Found a new AI generation pitfall? Have a better prompt strategy? PRs welcome!

Areas where contributions would be especially valuable:

• Animated sticker support (APNG format)
• Text overlay script (scripts/add_text.py) for programmatic text addition
• Additional style anchor templates for different character types
• Prompt strategies for other AI image models

License

MIT License — see LICENSE for details.

Credits

Created by Vista — built from real experience designing LINE sticker sets with AI.