--- name: banner-creator description: Create banners using AI image generation. Discuss format/style, generate variations, iterate with user feedback, crop to target ratio. Use when user wants to create a banner, header, hero image, cover image, GitHub banner, Twitter header, or readme banner. --- # Banner Creator Skill Create professional banners through AI image generation with an iterative design process. ## Prerequisites **Required API Keys (set in environment):** - `GEMINI_API_KEY` - Get from [Google AI Studio](https://aistudio.google.com/apikey) **Required Skills:** - `nanobanana` - AI image generation (Gemini 3 Pro Image) ## File Output Location All generated files should be saved to the `.skill-archive` directory: ``` .skill-archive/banner-creator// ``` **Example:** ``` .skill-archive/banner-creator/2026-01-19-opc-banner/ banner-01.png banner-02.png ... banner-03-cropped.png preview.html ``` ## Workflow ### Step 1: Discovery & Requirements Before generating, gather requirements from user: **Ask about:** 1. **Purpose** - Where will the banner be used? - GitHub README - Twitter/X header - LinkedIn banner - Website hero - YouTube channel art 2. **Target ratio/size** - See [references/formats.md](./references/formats.md): - `2:1` (1280x640) - GitHub README - `3:1` (1500x500) - Twitter header - `16:9` (1920x1080) - Website hero 3. **Style preference**: - Match existing logo/brand? - Pixel art / 8-bit retro - Minimalist / flat design - Gradient / modern - Illustrated / artistic 4. **Content elements**: - Brand name / project name? - Tagline / slogan? - Logo character to include? 5. **Color preferences**: - Existing brand colors? - Let AI decide? **Wait for user confirmation before proceeding!** ### Step 2: Generate Banner Variations Generate 20 banner variations using the `nanobanana` skill: ```bash # Generate single banner python3 /scripts/generate.py "{style} banner for {brand}, {description}, {text elements}" \ --ratio 21:9 -o .skill-archive/banner-creator//banner-01.png # Batch generate 20 banners python3 /scripts/batch_generate.py "{style} banner for {brand}, {description}, {text elements}" \ -n 20 --ratio 21:9 -d .skill-archive/banner-creator/ -p banner ``` **Guidelines:** - Generate at `21:9` ratio (widest available), crop later to target - Use batch_generate.py for multiple variations (includes auto-delay) - Use sequential naming: `banner-01.png`, `banner-02.png`, etc. **Image Editing (for incorporating existing logo):** ```bash python3 /scripts/generate.py "add {logo character} to the left side of the banner" \ -i /path/to/existing-logo.png --ratio 21:9 -o banner-with-logo.png ``` ### Step 3: Create HTML Preview Copy the preview template and open in browser: ```bash cp /templates/preview.html .skill-archive/banner-creator//preview.html ``` Then open in default browser: ```bash open .skill-archive/banner-creator//preview.html ``` **IMPORTANT:** Update the HTML to include the correct number of banners generated. ### Step 4: Iterate with User Ask user which banners they prefer: - "Which banners do you like? (e.g., #3, #7, #15)" - "What do you like about them?" - "Any changes you'd want?" Based on feedback: 1. Generate 10-20 more variations of favorite styles 2. Use naming: `banner-{original}-v{n}.png` (e.g., `banner-03-v1.png`) 3. Update HTML preview 4. Repeat until user selects final banner ### Step 5: Crop to Target Ratio Once user approves a banner, crop to target size: ```bash python3 /scripts/crop_banner.py {input.png} {output.png} --ratio 2:1 --width 1280 ``` **Common targets:** - GitHub README: `--ratio 2:1 --width 1280` → 1280x640 - Twitter header: `--ratio 3:1 --width 1500` → 1500x500 - Website hero: `--ratio 16:9 --width 1920` → 1920x1080 ### Step 6: Deliver Final Assets Present final deliverables: ``` ## Final Banner Assets | File | Description | Size | |------|-------------|------| | banner-03.png | Original (21:9) | 2016x864 | | banner-03-cropped.png | GitHub README (2:1) | 1280x640 | All files saved to: `.skill-archive/banner-creator//` Copy final banner to user's desired location. ``` ## Quick Reference ### Common Prompt Patterns **With Text:** ``` Wide banner for {brand}, {style} style, featuring "{text}" prominently displayed, {colors}, {scene/elements} ``` **With Character:** ``` Wide banner featuring {character description}, {style} style, {scene}, text "{brand name}" on {position}, {colors} ``` **Abstract/Gradient:** ``` Abstract {style} banner, {colors} gradient, geometric patterns, modern tech feel, text "{brand}" centered ``` **Scene-based:** ``` {Style} illustration banner, {scene description}, {character} in {action}, "{brand}" text overlay, {colors} ``` ### Supported Aspect Ratios Generate at widest ratio, then crop: - `21:9` - Ultra-wide (recommended for generation) - `16:9` - Wide - `3:2` - Standard wide ## References - [references/formats.md](./references/formats.md) - Common banner sizes by platform - [examples/opc-banner-creation.md](./examples/opc-banner-creation.md) - Full example conversation

Banner Creator

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Banner Creator

Install