Poster Forge

Universal image and poster generator with Chinese/English text support. Use when asked to create posters, social media images, cover images, infographics, comparison charts, tutorial cards, or any visual content. Three rendering engines with auto-fallback — AI generation (Pollinations.ai), HTML/CSS templates (Chromium screenshot), and pure PIL text rendering. Supports presets for Xiaohongshu, WeChat, Instagram, Twitter, and A4 print. Triggers on "make a poster", "generate image", "create cover", "design a card", "生成海报", "做封面图", "画图".

Universal poster/image generator with 3 engines and auto-fallback.

Engines

Engine	How	Best For	Reliability
ai	Pollinations.ai (flux model)	Artistic/photo backgrounds	~90% (network dependent)
html	Chromium headless screenshot	Precise layouts, text-heavy	~99% (needs Chromium)
text	PIL solid color + text overlay	Simple text posters	100%

Default mode is auto: tries AI → HTML → text fallback.

Quick Start

bash

# Simple poster with AI background
python3 scripts/generate.py --title "你的标题" --prompt "watercolor sunset" --output poster.jpg

# Split comparison (HTML engine, no network needed)
python3 scripts/generate.py --title "A vs B" --mode html --template split \
  --left-label "方案A" --right-label "方案B" \
  --left-items "优点1|优点2" --right-items "优点1|优点2" --output compare.jpg

# Tutorial card
python3 scripts/generate.py --title "教程标题" --mode html --template tutorial \
  --code-content "print('hello')" --tagline "底部提示语" --output tutorial.jpg

Parameters

Core

• --title (required): Main title
• --subtitle: Secondary text
• --tagline: Bottom tagline
• --mode: ai | html | text | auto (default: auto)
• --output: Output file path

Templates (HTML engine)

• --template: split | gradient | card | tutorial

Size presets

• --preset: xiaohongshu (1080×1440) | wechat (900×500) | instagram (1080×1080) | twitter (1200×675) | a4 (2480×3508)
• --width / --height: Custom dimensions

Split template

• --left-label / --right-label: Side labels
• --left-items / --right-items: Pipe-separated content items
• --left-color / --right-color: R,G,B colors

Text overlay

• --text-position: bottom | center | top | none
• --font-title-size / --font-sub-size: Font sizes
• --no-overlay: Skip PIL text overlay (when HTML already has text)

AI engine

• --prompt: English description for Pollinations.ai

Workflow for Agents

1. Decide content and style
2. Choose mode: auto for flexibility, html for reliability, ai for aesthetics
3. Run scripts/generate.py with appropriate args
4. If using html mode with --template, add --no-overlay (text is already in the HTML)
5. Send output image to user

Requirements

• Python 3 + Pillow (PIL)
• curl (for AI engine font download)
• Chromium/Chrome (for HTML engine, optional)