# baoyu-cover-image
Generates article cover images with 5 dimensions (type, palette, rendering, text, mood) combining 9 color palettes and 6 rendering styles. Supports cinematic (2.35:1), widescreen (16:9), and square (1:1) aspects. Use when user asks to "generate cover image", "create article cover", or "make cover".
## Installation
This is a skill for [Gemini CLI](https://github.com/google/gemini-cli).
To install this skill:
1. Clone this repository.
2. Run the install command:
```bash
gemini skills install ./baoyu-cover-image
```
## Documentation
# Cover Image Generator
Generate elegant cover images for articles with 5-dimensional customization.
## Usage
```bash
# Auto-select all dimensions based on content
/baoyu-cover-image path/to/article.md
# Quick mode: skip confirmation, use auto-selection
/baoyu-cover-image article.md --quick
# Specify dimensions (new 5D system)
/baoyu-cover-image article.md --type conceptual --palette warm --rendering flat-vector
/baoyu-cover-image article.md --text title-subtitle --mood bold
# Style presets (backward-compatible shorthand for palette + rendering)
/baoyu-cover-image article.md --style blueprint
/baoyu-cover-image article.md --style blueprint --rendering hand-drawn # override rendering
# Visual only (no title text)
/baoyu-cover-image article.md --no-title
# Direct content input
/baoyu-cover-image
[paste content]
# Direct input with options
/baoyu-cover-image --palette mono --rendering digital --aspect 1:1 --quick
[paste content]
# With reference images
/baoyu-cover-image article.md --ref style-ref.png
/baoyu-cover-image article.md --ref ref1.png ref2.png --quick
```
## Options
| Option | Description |
|--------|-------------|
| `--type <name>` | Cover type: hero, conceptual, typography, metaphor, scene, minimal |
| `--palette <name>` | Color palette: warm, elegant, cool, dark, earth, vivid, pastel, mono, retro |
| `--rendering <name>` | Rendering style: flat-vector, hand-drawn, painterly, digital, pixel, chalk |
| `--style <name>` | Preset shorthand (expands to palette + rendering, see [Style Presets](references/style-presets.md)) |
| `--text <level>` | Text density: none, title-only, title-subtitle, text-rich |
| `--mood <level>` | Emotional intensity: subtle, balanced, bold |
| `--aspect <ratio>` | 16:9 (default), 2.35:1, 4:3, 3:2, 1:1, 3:4 |
| `--lang <code>` | Title language (en, zh, ja, etc.) |
| `--no-title` | Alias for `--text none` |
| `--quick` | Skip confirmation, use auto-selection for missing dimensions |
| `--ref <files...>` | Reference images for style/composition guidance |
## Five Dimensions
| Dimension | Controls | Values | Default |
|-----------|----------|--------|---------|
| **Type** | Visual composition, information structure | hero, conceptual, typography, metaphor, scene, minimal | auto |
| **Palette** | Colors, color scheme, decorative hints | warm, elegant, cool, dark, earth, vivid, pastel, mono, retro | auto |
| **Rendering** | Line quality, texture, depth, element style | flat-vector, hand-drawn, painterly, digital, pixel, chalk | auto |
| **Text** | Text density, information hierarchy | none, title-only, title-subtitle, text-rich | title-only |
| **Mood** | Emotional intensity, visual weight | subtle, balanced, bold | balanced |
Dimensions can be freely combined. Auto-selection rules: [references/auto-selection.md](references/auto-selection.md)
## Type Gallery
| Type | Description | Best For |
|------|-------------|----------|
| `hero` | Large visual impact, title overlay | Product launch, brand promotion, major announcements |
| `conceptual` | Concept visualization, abstract core ideas | Technical articles, methodology, architecture design |
| `typography` | Text-focused layout, prominent title | Opinion pieces, quotes, insights |
| `metaphor` | Visual metaphor, concrete expressing abstract | Philosophy, growth, personal development |
| `scene` | Atmospheric scene, narrative feel | Stories, travel, lifestyle |
| `minimal` | Minimalist composition, generous whitespace | Zen, focus, core concepts |
Type composition details: [references/types.md](references/types.md)
## Palette Gallery
| Palette | Vibe | Primary Colors |
|---------|------|----------------|
| `warm` | Friendly, approachable | Orange, golden yellow, terracotta |
| `elegant` | Sophisticated, refined | Soft coral, muted teal, dusty rose |
| `cool` | Technical, professional | Engineering blue, navy, cyan |
| `dark` | Cinematic, premium | Electric purple, cyan, magenta |
| `earth` | Natural, organic | Forest green, sage, earth brown |
| `vivid` | Energetic, bold | Bright red, neon green, electric blue |
| `pastel` | Gentle, whimsical | Soft pink, mint, lavender |
| `mono` | Clean, focused | Black, near-black, white |
| `retro` | Nostalgic, vintage | Muted orange, dusty pink, maroon |
Palette definitions: [references/palettes/](references/palettes/)
## Rendering Gallery
| Rendering | Description | Key Characteristics |
|-----------|-------------|---------------------|
| `flat-vector` | Clean modern vector | Uniform outlines, flat fills, geometric icons |
| `hand-drawn` | Sketchy organic illustration | Imperfect strokes, paper texture, doodles |
| `painterly` | Soft watercolor/paint | Brush strokes, color bleeds, soft edges |
| `digital` | Polished modern digital | Precise edges, subtle gradients, UI components |
| `pixel` | Retro 8-bit pixel art | Pixel grid, dithering, chunky shapes |
| `chalk` | Chalk on blackboard | Chalk strokes, dust effects, board texture |
Rendering definitions: [references/renderings/](references/renderings/)
## Text & Mood
| Text Level | Title | Subtitle | Tags | Use Case |
|------------|:-----:|:--------:|:----:|----------|
| `none` | - | - | - | Pure visual, no text |
| `title-only` | ✓ | - | - | Simple headline (default) |
| `title-subtitle` | ✓ | ✓ | - | Title + supporting context |
| `text-rich` | ✓ | ✓ | ✓ (2-4) | Information-dense |
| Mood | Contrast | Saturation | Weight | Use Case |
|------|:--------:|:----------:|:------:|----------|
| `subtle` | Low | Muted | Light | Corporate, thought leadership |
| `balanced` | Medium | Normal | Medium | General articles (default) |
| `bold` | High | Vivid | Heavy | Announcements, promotions |
Full guides: [references/dimensions/text.md](references/dimensions/text.md) | [references/dimensions/mood.md](references/dimensions/mood.md)
## Style Presets & Compatibility
- **Style Presets**: `--style X` expands to palette + rendering. See [references/style-presets.md](references/style-presets.md)
- **Compatibility Matrices**: Palette×Rendering, Type×Rendering, Type×Text, Type×Mood. See [references/compatibility.md](references/compatibility.md)
- ✓✓ = highly recommended | ✓ = compatible | ✗ = not recommended
## File Structure
Output directory depends on `default_output_dir` preference:
| Preference | Output Path |
|------------|-------------|
| `same-dir` | `{article-dir}/` |
| `imgs-subdir` | `{article-dir}/imgs/` |
| `independent` (default) | `cover-image/{topic-slug}/` |
| Pasted content | `cover-image/{topic-slug}/` (always) |
```
<output-dir>/
├── source-{slug}.{ext} # Source files (text, images, etc.)
├── refs/ # Reference images (if provided)
│ ├── ref-01-{slug}.{ext}
│ ├── ref-01-{slug}.md # Description file (optional)
│ ├── ref-02-{slug}.{ext}
│ ├── ref-02-{slug}.md # Description file (optional)
│ └── extracted-style.md # Verbally extracted style (if no file path)
├── prompts/cover.md # Generation prompt
└── cover.png # Output image
```
**Slug**: Extract main topic (2-4 words, kebab-case). Example: "The Future of AI" → `future-of-ai`
**Conflict**: If directory exists, append timestamp: `{topic-slug}-YYYYMMDD-HHMMSS`
**Source Files**: Copy all sources with naming `source-{slug}.{ext}` (multiple supported)
## Workflow
### Progress Checklist
```
Cover Image Progress:
- [ ] Step 0: Check preferences (EXTEND.md) ⛔ BLOCKING
- [ ] Found → load preferences → continue
- [ ] Not found → run first-time setup → MUST complete before Step 1
- [ ] Step 1: Analyze content + determine output directory
- [ ] 1.1 Reference images ⚠️ (if provided)
- [ ] File path given → saved to refs/ ✓
- [ ] No path → asked user OR extracted verbally
- [ ] 1.2 Output directory determined
- [ ] Step 2: Confirm options (5 dimensions) ⚠️ REQUIRED unless --quick or all specified
- [ ] Step 3: Create prompt
- [ ] References in prompt ONLY if files exist in refs/
- [ ] Extracted style/palette appended to prompt body (if no file)
- [ ] Step 3.5: Confirm prompt with user ⛔ BLOCKING
- [ ] Step 4: Generate image
- [ ] 4.1 References verified before generation
- [ ] 4.2 Pass refs via --ref if skill supports AND files exist
- [ ] Step 5: Completion report
```
### Flow
```
Input → [Step 0: Preferences] ─┬─ Found → Continue
│
└─ Not found → First-Time Setup ⛔ BLOCKING
│
└─ Complete setup → Save EXTEND.md → Continue
│
┌───────────────────────────────────────────────────────────────────────────┘
↓
Analyze + Save Refs → [Output Dir ⚠️] → [Confirm: 5 Dimensions] → Prompt → Generate → Complete
↓
(skip if --quick or all specified)
```
### Step 0: Load Preferences (EXTEND.md) ⛔ BLOCKING
**Purpose**: Load user preferences or run first-time setup.
**CRITICAL**: If EXTEND.md not found, MUST complete first-time setup before ANY other questions or steps. Do NOT proceed to content analysis, do NOT ask about reference images, do NOT ask about dimensions — ONLY complete the preferences setup first.
Use Bash to check EXTEND.md existence (priority order):
```bash
# Check project-level first
test -f .baoyu-skills/baoyu-cover-image/EXTEND.md && echo "project"
# Then user-level (cross-platform: $HOME works on macOS/Linux/WSL)
test -f "$HOME/.baoyu-skills/baoyu-cover-image/EXTEND.md" && echo "user"
```
| Result | Action |
|--------|--------|
| Found | Read, parse, display preferences summary → Continue to Step 1 |
| Not found | ⛔ **BLOCKING**: Run first-time setup ONLY ([references/config/first-time-setup.md](references/config/first-time-setup.md)) → Complete and save EXTEND.md → Then continue to Step 1 |
**Preferences Summary** (when found):
```
Preferences loaded from [project/user]:
• Watermark: [enabled/disabled] [content if enabled]
• Type/Palette/Rendering: [value or "auto"]
• Text: [value or "title-only"] | Mood: [value or "balanced"]
• Aspect: [default_aspect] | Output: [dir or "not set — will ask in Step 1.5"]
• Quick mode: [enabled/disabled] | Language: [value or "auto"]
```
**EXTEND.md Supports**: Watermark | Preferred type | Preferred palette | Preferred rendering | Preferred text | Preferred mood | Default aspect ratio | Default output directory | Quick mode | Custom palette definitions | Language preference
Schema: [references/config/preferences-schema.md](references/config/preferences-schema.md)
### Step 1: Analyze Content
**1.0 Detect & Save Reference Images** ⚠️ REQUIRED if images provided
Check if user provided reference images. Handle based on input type:
| Input Type | Action |
|------------|--------|
| Image file path provided | Copy to `refs/` subdirectory → can use `--ref` |
| Image in conversation (no path) | **ASK user for file path** with AskUserQuestion |
| User can't provide path | Extract style/palette verbally → append to prompt (NO frontmatter references) |
**CRITICAL**: Only add `references` to prompt frontmatter if files are ACTUALLY SAVED to `refs/` directory.
**If user provides file path**:
1. Copy to `refs/ref-NN-{slug}.{ext}` (NN = 01, 02, ...)
2. Create description: `refs/ref-NN-{slug}.md`
3. Verify files exist before proceeding
**If user can't provide path** (extracted verbally):
1. Analyze image visually, extract: colors, style, composition
2. Create `refs/extracted-style.md` with extracted info
3. DO NOT add `references` to prompt frontmatter
4. Instead, append extracted style/colors directly to prompt text
**Description File Format** (only when file saved):
```yaml
---
ref_id: NN
filename: ref-NN-{slug}.{ext}
usage: direct | style | palette
---
[User's description or auto-generated description]
```
| Usage | When to Use |
|-------|-------------|
| `direct` | Reference matches desired output closely |
| `style` | Extract visual style characteristics only |
| `palette` | Extract color scheme only |
**Verification** (only for saved files):
```
Reference Images Saved:
- ref-01-{slug}.png ✓ (can use --ref)
- ref-02-{slug}.png ✓ (can use --ref)
```
**Or for extracted style**:
```
Reference Style Extracted (no file):
- Colors: #E8756D coral, #7ECFC0 mint...
- Style: minimal flat vector, clean lines...
→ Will append to prompt text (not --ref)
```
---
**1.1 Save Source Content**
- If pasted, save to `source.md` in target directory; if file path, use as-is
- **Backup rule**: If `source.md` exists, rename to `source-backup-YYYYMMDD-HHMMSS.md`
**1.2 Content Analysis**
- Extract topic, core message, tone, keywords
- Identify visual metaphors
- Detect content type
**1.3 Reference Image Analysis** (if provided in Step 1.0)
For each reference image:
| Analysis | Description |
|----------|-------------|
| Visual characteristics | Style, colors, composition |
| Content/subject | What the reference depicts |
| Style match | Which type/palette/rendering align |
| Usage recommendation | `direct` / `style` / `palette` |
**1.4 Language Detection**
- Detect source language
- Note user's input language
- Compare with EXTEND.md preference
**1.5 Determine Output Directory**
- Per File Structure rules
- If no `default_output_dir` preference + file path input, include in Step 2 Q4
### Step 2: Confirm Options ⚠️
Validate all 5 dimensions + aspect ratio. Full confirmation flow: [references/workflow/confirm-options.md](references/workflow/confirm-options.md)
**Skip Conditions**:
| Condition | Skipped | Still Asked |
|-----------|---------|-------------|
| `--quick` or `quick_mode: true` | 5 dimensions | Aspect ratio (unless `--aspect`) |
| All 5 + `--aspect` specified | All | None |
### Step 3: Create Prompt
**Backup rule**: If `prompts/cover.md` exists, rename to `prompts/cover-backup-YYYYMMDD-HHMMSS.md`
Save to `prompts/cover.md`. Full template: [references/workflow/prompt-template.md](references/workflow/prompt-template.md)
**CRITICAL - References in YAML Frontmatter**:
When reference files are saved to `refs/`, **MUST add `references` field in frontmatter**:
```yaml
---
type: cover
palette: warm
rendering: flat-vector
references:
- ref_id: 01
filename: refs/ref-01-podcast-thumbnail.jpg
usage: style
---
```
| Rule | Action |
|------|--------|
| Files saved to `refs/` | Add to frontmatter `references` list |
| Style extracted verbally (no file) | Omit `references` field, describe in body |
| Before writing | Verify: `test -f refs/ref-NN-{slug}.{ext}` |
**Reference Embedding**:
| Situation | Frontmatter | Body |
|-----------|-------------|------|
| Reference file saved to `refs/` | Add to `references` ✓ | Brief style note |
| Style extracted verbally (no file) | Omit `references` | Full style description |
| File in frontmatter but doesn't exist | ERROR - fix or remove | — |
### Step 4: Generate Image
**4.1 Backup existing** `cover.png` → `cover-backup-YYYYMMDD-HHMMSS.png` (if regenerating)
**4.2 Check available image generation skills**; if multiple, ask user preference
**4.3 Process References** ⚠️ REQUIRED if references in frontmatter
**Read `references` from prompt frontmatter** and process each entry:
1. **Parse frontmatter** to get references list:
```yaml
references:
- ref_id: 01
filename: refs/ref-01-podcast-thumbnail.jpg
usage: style
```
2. **VERIFY each file exists**:
```bash
test -f refs/ref-NN-{slug}.{ext} && echo "exists" || echo "MISSING"
```
- If file MISSING → ERROR, fix prompt or remove from references
- If file exists → proceed with processing
3. Process based on `usage` type:
| Usage | Action | Example |
|-------|--------|---------|
| `direct` | Add reference path to `--ref` parameter | `--ref refs/ref-01-brand.png` |
| `style` | Analyze reference, append style traits to prompt | "Style: clean lines, gradient backgrounds..." |
| `palette` | Extract colors from reference, append to prompt | "Colors: #E8756D coral, #7ECFC0 mint..." |
3. Check image generation skill capability:
| Skill Supports `--ref` | Action |
|------------------------|--------|
| Yes (e.g., baoyu-image-gen with Google) | Pass reference images via `--ref` |
| No | Convert to text description, append to prompt |
**Verification**: Before generating, confirm reference processing:
```
Reference Processing:
- ref-01-brand.png: using as direct reference ✓
- ref-02-style.png: extracted palette ✓
```
**4.4 Generate**
1. Call selected skill with prompt file path, output path (`cover.png`), aspect ratio
2. If references with `direct` usage AND skill supports `--ref`: include `--ref` parameter
3. On failure: auto-retry once before reporting error
### Step 5: Completion Report
```
Cover Generated!
Topic: [topic]
Type: [type] | Palette: [palette] | Rendering: [rendering]
Text: [text] | Mood: [mood] | Aspect: [ratio]
Title: [title text or "visual only"]
Language: [lang] | Watermark: [enabled/disabled]
References: [N images (direct/style/palette) or "extracted style" or "none"]
Location: [directory path]
Files:
✓ source-{slug}.{ext}
[✓ refs/ref-01-{slug}.{ext} ... (if references saved)]
[✓ refs/ref-01-{slug}.md ... (description files)]
[✓ refs/extracted-style.md (if style extracted verbally)]
✓ prompts/cover.md
✓ cover.png
[✓ cover-backup-{timestamp}.png (if regenerated)]
```
## Image Modification
| Action | Steps |
|--------|-------|
| **Regenerate** | Backup existing → **Update prompt file FIRST** → Regenerate with same settings |
| **Change dimension** | Backup existing → Confirm new value → **Update prompt file FIRST** → Regenerate |
**IMPORTANT**: When regenerating, ALWAYS update the prompt file (`prompts/cover.md`) FIRST before regenerating. This ensures changes are documented and reproducible.
All modifications automatically backup existing `cover.png` before regenerating.
## Notes
- Cover must be readable at small preview sizes
- Visual metaphors > literal representations
- Title: readable, impactful
- Two confirmation points: Step 0 (first-time setup) + Step 2 (options) - skip Step 2 with `--quick`
- Use confirmed language for title text
- Maintain watermark consistency if enabled
- Check compatibility matrices when selecting combinations
- `--no-title` is alias for `--text none`
- `--style` presets are backward-compatible; explicit `--palette`/`--rendering` override preset values
### Composition Principles
- **Generous whitespace**: 40-60% breathing room; avoid cluttered layouts
- **Visual anchor**: Main element centered or offset left (reserve right for title)
- **Character handling**: Simplified silhouettes or icon-style figures; NO realistic humans
- **Icon vocabulary**: Use simple, recognizable symbols (see [references/visual-elements.md](references/visual-elements.md))
### Title Handling
- **Source**: Use the exact title provided by user, or extract from source content
- **Do NOT invent titles**: Stay faithful to the original
- If no title in source and user doesn't provide one, ask user to specify
## References
**Dimensions**: [text.md](references/dimensions/text.md) | [mood.md](references/dimensions/mood.md)
**Palettes**: [references/palettes/](references/palettes/)
**Renderings**: [references/renderings/](references/renderings/)
**Auto-Selection**: [references/auto-selection.md](references/auto-selection.md)
**Style Presets**: [references/style-presets.md](references/style-presets.md)
**Compatibility**: [references/compatibility.md](references/compatibility.md)
**Types**: [references/types.md](references/types.md)
**Visual Elements**: [references/visual-elements.md](references/visual-elements.md)
**Workflow**: [confirm-options.md](references/workflow/confirm-options.md) | [prompt-template.md](references/workflow/prompt-template.md)
**Config**: [preferences-schema.md](references/config/preferences-schema.md) | [first-time-setup.md](references/config/first-time-setup.md) | [watermark-guide.md](references/config/watermark-guide.md)