AI-Powered Editorial & Infographic Post Cover Engine with Google E-E-A-T Optimization, Dynamic Font-Fitting Typography, and Native Multilingual (ZH / EN / RU / JA) Rendering.
Transform generic stock photos into authoritative, high-CTR editorial covers with frosted-glass bottom banners, automated HD background retrieval, zero-token local rendering, and full Schema.org structured data automation.
- Why We Built This Skill (The Core Problem)
- Showcase & Real-World Case Studies
- Key Features
- Installation
- Using as a Cursor / Claude Code Agent Skill
- Command Line Interface (CLI)
- Python API Integration
- Color Theme Presets
- Project Structure
- License
In high-traffic content publishing, technical blogging, and interactive data sites (such as tier lists, hardware benchmarks, and competitive gaming analytics), cover images directly determine Google Discover visibility, SERP Click-Through Rates (CTR), and E-E-A-T quality scores.
However, standard publishing workflows face five major architectural and algorithmic bottlenecks:
- The Problem: Using raw stock photography or scraped wallpapers penalizes your site under Google's Helpful Content Update (HCU) and Information Gain algorithms. Search crawlers (such as Googlebot-Image) compute Perceptual Hashes (pHash) to detect image duplication across the web. If your cover matches identical instances on other domains, your page is classified as low-effort aggregator content.
- Why Frontend CSS Overlays Fail: Many sites attempt to overlay titles dynamically via CSS on top of raw background images. However, Googlebot-Image, Google Discover crawlers, Twitter Card scrapers, and OpenGraph bots only download the raw binary
.webp/.jpgfile—they never execute the CSS layer. To search algorithms, your image remains an unmodified stock photo. - The Solution:
post-coverphysically composites the frosted-glass dock banner, typography, and theme accent lines directly into the pixel raster, producing a globally unique visual embedding.
- Modern search engines integrate multi-modal Vision AI encoders to evaluate rich media.
- When Vision AI parses an image, it performs OCR character extraction. When the text extracted from the image pixels (for example,
Top Earning FPS & Tactical Shooter Players Tier List 2026) 100% aligns with the article's<h1>,<title>, OpenGraph tags, andSchema.org ImageObject, Google awards high-confidence editorial authenticity, unlocking Google Discover placement and prominent SERP thumbnails.
- Commercial generative models (DALL-E 3, Midjourney, Flux) cost $0.02 – $0.08 per image, introduce significant API latency (5–15 seconds), and frequently hallucinate garbled characters or spelling mistakes on complex titles.
post-coveruses programmatic Python PIL compositing:- Cost: $0.00 / Zero LLM token consumption.
- Speed: ~0.03 seconds per image.
- Reliability: 100% deterministic, razor-sharp typography with zero typos.
- Global websites targeting American, European, Chinese, and Russian markets often underperform in non-English locales because their graphic assets remain unlocalized.
post-coverenables synchronous generation of native localized covers (_en.webp,_zh.webp,_ru.webp), providing localized visual relevance that drives higher regional CTR in Google US, Google RU, and Baidu.
- Languages vary substantially in text length and character density: Russian compound nouns are notoriously long, English technical titles span multiple words, and Chinese characters are dense and compact.
- Fixed-size templates inevitably break or clip text.
post-coverimplements Dynamic Font-Fitting: it calculates physical pixel bounding boxes in real time, automatically scaling font sizes (52px -> 36px) and applying clean ellipsis truncation (...) so no title ever overflows or overlaps.
Below are production editorial covers generated by post-cover demonstrating the Dock Banner frosted-glass treatment, theme accent styling, and multilingual dynamic typography.
Theme:
sky_blue/ Cyan Accent | Category: Tactical Esports & Pro Player Analytics
Theme:
orange_esports/ Vibrant Orange Accent | Category: Fighting Games (EVO / Capcom Cup / Tekken)
- Dock Banner Design Paradigm: Crisp 16:9 (
1920×1080) canvas with a frosted glass dock (GaussianBlur(radius=24)+ midnight dark tint + glowing 3px theme accent line). - Dynamic Font Fitting (Anti-Overflow): Dynamically scales font size to fit within the
1220pxmaximum title container, with graceful ellipsis truncation to prevent text overflow. - Native Multilingual Matrix: Zero-cost batch rendering for Chinese (
zh), English (en), Russian (ru), Japanese (ja), and more with cross-platform font resolution. - Zero-API & Multi-Source Image Retrieval: 4-tier resilient background acquisition (Local offline images, 100% free DuckDuckGo web search, procedural dark ambient gradient, and optional Firecrawl/Unsplash enterprise APIs).
- Schema.org & SEO Generator: Automatically outputs Schema.org
ImageObjectJSON-LD, Next.js App Router metadata snippets, and standard OpenGraph/Twitter<meta>tags. - Turnkey Cursor / Claude Agent Skill: Drop
.cursor/skills/post-cover/directly into any codebase for autonomous agent workflows.
post-cover is built with a Zero-API & Zero-Cost First design philosophy. You do not need any paid subscription or API key to generate stunning covers.
[ Background Sourcing Pipeline ]
│
┌───────────────────────────────┼──────────────────────────────┐
▼ ▼ ▼
[ Tier 1: Local File ] [ Tier 2: Free Web Search ] [ Tier 3: Optional APIs ]
--image local.jpg Zero API Key / Zero Signup FIRECRAWL_API_KEY / UNSPLASH
100% Offline & Instant DuckDuckGo 16:9 HD Filter Curated Stock & Deep Crawl
│ │ │
└───────────────────────────────┬──────────────────────────────┘
▼
[ Tier 4: Offline Fallback ]
Procedural Ambient Gradient
│
▼
[ 1920x1080 WebP Dock Cover ]
You have three out-of-the-box options:
-
Option A: Use Local Images (100% Offline / No Network Needed) Provide any local screenshot, wallpaper, or product photo. The engine automatically handles focal-center cropping and frosted-glass compositing:
python3 -m post_cover.cli generate --image my_photo.jpg --title "My Article Title" --theme emerald -
Option B: Use Built-in Automated Web Search (100% Free / Zero API Key / No Registration)
post-coverincludes a built-in DuckDuckGo / Bing image scraping engine. Simply runsearch-and-generatewithout setting any keys:python3 -m post_cover.cli search-and-generate --query "cyberpunk gaming setup" --title "2026 Gaming Gear Tier List" --theme cyber_purple
-
Option C: Procedural Ambient Gradient (Offline Network Failure Fallback) If your machine is offline or search queries return no matches,
post-coverautomatically synthesizes a high-end dark procedural gradient with ambient glow spheres matching your color theme.
If you possess commercial API credentials, simply export them as environment variables (the engine detects them automatically):
# Optional: Deep web search via Firecrawl
export FIRECRAWL_API_KEY="fc-your-api-key"
# Optional: Curated royalty-free photography via Unsplash
export UNSPLASH_ACCESS_KEY="your-unsplash-key"Security Guarantee: The repository contains 0 hardcoded credentials or API keys. All API integrations strictly read from runtime environment variables.
# Clone the repository
git clone https://github.com/chainepic/post-cover.git
cd post-cover
# Install lightweight dependencies (Pillow + requests)
pip install -r requirements.txt
# (Optional) Install CLI globally in editable mode
pip install -e .You can integrate this skill into any existing or new project:
Copy .cursor/skills/post-cover/ into your target project:
cp -r .cursor/skills/post-cover /path/to/your-project/.cursor/skills/When writing or updating blog posts, prompt your AI coding agent:
"Use post-cover to generate high-resolution localized covers (ZH, EN, RU) for my latest article about Next.js 15 performance benchmarks, search for relevant background images automatically, and inject the Schema.org metadata."
The agent will autonomously:
- Extract title, subtitle, evaluation metrics, and tag entities from the article.
- Search and download high-resolution 4K background photography.
- Render pristine
_zh.webp,_en.webp, and_ru.webpcovers. - Update your CMS / JSON stores and inject structured SEO data.
python3 -m post_cover.cli search-and-generate \
--query "flagship smartphone processor silicon chip" \
--title "2026 Flagship Smartphone Processor Tier List" \
--subtitle "Snapdragon 8 Elite, Dimensity 9400 & Apple A18 Pro" \
--note "Tested on sustained 3D gaming, thermal curves & efficiency" \
--tags "Includes: Snapdragon · Dimensity · Apple A-Series" \
--cta "Interactive Drag & Drop Tier Maker" \
--theme emerald \
--lang en \
--out "soc_tier_list_en.webp"python3 -m post_cover.cli generate \
--image "path/to/background.jpg" \
--title "2026 Modern Web Frameworks Architecture Tier List" \
--subtitle "Next.js 15, Astro 5, Remix & Nuxt 3 Comprehensive Evaluation" \
--note "Benchmarked on SSR TTFB, bundle payload, and edge runtime support" \
--tags "Includes: Next.js · Astro · Remix · Nuxt · SvelteKit" \
--cta "Interactive Drag & Drop Tier Maker" \
--theme sky_blue \
--lang en \
--out "cover_en.webp"python3 -m post_cover.cli seo \
--url "https://yourdomain.com/uploads/covers/soc_tier_list_en.webp" \
--title "2026 Flagship Smartphone Processor Tier List" \
--description "Comprehensive benchmarks of Snapdragon 8 Elite, Dimensity 9400 and A18 Pro."from post_cover import render_dock_cover, find_background_image
# 1. Automatically retrieve contextual background
bg_path = "temp_bg.webp"
find_background_image("gaming keyboard mechanical rgb", bg_path)
# 2. Render localized cover with frosted glass dock
render_dock_cover(
src_image_path=bg_path,
title="2026 全球顶级机械键盘与磁轴键盘性能天梯榜",
subtitle="Wooting 60HE · 雷蛇猎魂光蛛 · 8000Hz 快速触发排行",
note="基于 0.1mm 急速断触、RT 调节精度与 8K 回报率全链路实测",
tags="评测维度：急停精度 · 驱动算法 · 轴体手感 · 延迟表现",
cta_text="全平台在线拖拽 · 免费生成排位",
brand_text="TECH INSIGHTS · 权威开放式天梯图数据库",
theme_name="crimson_red",
lang="zh",
out_path="keyboard_cover_zh.webp"
)| Theme Name | Accent Color | Vibe / Recommended Category |
|---|---|---|
emerald |
#34d399 (Emerald) |
Hardware benchmarks, power efficiency, mobile chips, clean tech |
sky_blue |
#38bdf8 (Sky Blue) |
Tactical shooters, CS2/Valorant, cloud architecture, web dev |
amber_gold |
#fbbf24 (Amber Gold) |
Prize pool rankings, financial analytics, champion trophies, luxury |
crimson_red |
#f43f5e (Crimson) |
Gaming peripherals, mechanical keyboards, Dota 2, breaking news |
cyber_purple |
#a855f7 (Cyber Purple) |
AI models, LLMs, neural networks, futurism, mobile esports |
orange_esports |
#f97316 (Vibrant Orange) |
Fighting games (EVO/Capcom Cup), extreme sports, DIY tech |
slate_minimal |
#94a3b8 (Slate Gray) |
Developer tools, open-source utilities, minimalist editorial |
post-cover/
├── .cursor/
│ └── skills/
│ └── post-cover/
│ └── SKILL.md # Cursor / Claude Agent Skill definition
├── assets/
│ └── showcase/ # High-res sample images across 3 languages
│ ├── fps_players_cover_zh.webp
│ ├── fps_players_cover_en.webp
│ ├── fps_players_cover_ru.webp
│ ├── fighting_games_cover_zh.webp
│ ├── fighting_games_cover_en.webp
│ └── fighting_games_cover_ru.webp
├── post_cover/
│ ├── __init__.py # Package exports
│ ├── cli.py # Unified command-line runner
│ ├── config.py # Preset dimensions & color palettes
│ ├── core.py # Core PIL rendering & font-fitting engine
│ ├── fonts.py # Cross-platform font resolver (Linux/macOS/Windows)
│ ├── search.py # Firecrawl / Unsplash / Web search provider
│ └── seo.py # Schema.org & Next.js metadata generator
├── examples/
│ ├── generate_single.py # Single cover code example
│ ├── generate_multilingual.py # 3-language generation example
│ └── batch_config.json # Batch configuration template
├── requirements.txt
├── pyproject.toml
├── LICENSE
└── README.md
MIT License (c) 2026 Chainepic.