# YouTube Thumbnail Generator v2.1

Professional YouTube thumbnail automatic generation tool with intelligent Chinese/English text layout, logo, and precise image control with dynamic adaptation.

**Author**: Leo Wang (https://leowang.net)

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📦 [![Downloads](https://img.shields.io/pypi/dm/youtube-thumbnail-generator)](https://pypi.org/project/youtube-thumbnail-generator/)
[![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)

**🌍 Available on PyPI**: https://pypi.org/project/youtube-thumbnail-generator/  
**📂 GitHub Repository**: https://github.com/preangelleo/youtube-thumbnail-generator

## 📋 Core Features

- ✅ **Intelligent Chinese/English System**: PNG overlay technology, perfect Chinese/English text mixing
- ✅ **Smart Line-breaking Algorithm**: Chinese 9 character limits, English 3-line truncation  
- ✅ **Font Differentiation Optimization**: Chinese fonts 30% larger for optimal readability
- ✅ **Professional Visual Effects**: Triangle transition integrated into images, text always on top layer
- ✅ **Intelligent Image Processing**: Auto square conversion + 900x900 filling
- ✅ **Multi-endpoint API Support**: Flask RESTful API + Chapter functionality
- ✅ **Smart Font Selection**: Chinese PingFang/Founder, English Lexend Bold
- ✅ **Three Theme Modes**: Dark (black bg), Light (white bg), Custom (user template)
- ✅ **Full Color Customization**: Title color, author color, triangle toggle - all parameterized
- ✅ **Dynamic Font Scaling**: Auto font size adjustment based on text length (1-17 characters)
- ✅ **YouTube API Ready**: Built-in optimization for YouTube API v3 thumbnail upload compliance

## 🎨 Three Theme Modes

**Canvas Size**: 1600x900 pixels

### 🌑 Dark Theme - Professional Black Background
**Perfect for**: Tech content, gaming, serious topics  
**Features**: Black background + White bold text + Black triangle overlay + Professional contrast

#### Chinese Sample (10 characters - optimal length)
![Chinese Dark Theme](https://api.sumatman.ai/image/20250808_232317_chinese_sample_template_dark.jpg)

#### English Sample (7 words - optimal length)  
![English Dark Theme](https://api.sumatman.ai/image/20250808_232340_english_sample_template_dark.jpg)

### 🌕 Light Theme - Clean White Background
**Perfect for**: Educational content, lifestyle, bright topics  
**Features**: White background + Black bold text + White triangle overlay + Clean minimalist look

#### Chinese Sample (10 characters - optimal length)
![Chinese Light Theme](https://api.sumatman.ai/image/20250808_232325_chinese_sample_template_light.jpg)

#### English Sample (7 words - optimal length)
![English Light Theme](https://api.sumatman.ai/image/20250808_232346_english_sample_template_light.jpg)

### 🌈 Custom Theme - Your Own Background
**Perfect for**: Brand content, creative projects, unique aesthetics  
**Features**: Custom 1600x900 background + Customizable text colors + No triangle overlay + Full creative control

#### Chinese Sample (10 characters - optimal length)
![Chinese Custom Theme](https://api.sumatman.ai/image/20250808_232332_chinese_sample_template_custom.jpg)

#### English Sample (7 words - optimal length)
![English Custom Theme](https://api.sumatman.ai/image/20250808_232353_english_sample_template_custom.jpg)

## 💡 Optimal Length Recommendations

### 🎯 Best Results Guidelines
For the most professional and visually appealing thumbnails:

#### 🇨🇳 Chinese Titles
**Optimal Length: 10-12 characters**
- **10 characters**: Perfect balance, excellent readability
- **12 characters**: Maximum recommended, maintains clarity
- **Examples**: "AI技术指南教程" (8 chars) ✅ "完整AI技术指南教程系统" (12 chars) ✅

#### 🇺🇸 English Titles  
**Optimal Length: 7 words**
- **7 words**: Perfect for 3-line layout without truncation
- **Example**: "Complete AI Technology Guide Tutorial Series Episode" (7 words) ✅
- **Note**: Longer titles may be truncated with ellipsis (...)

## 📦 Supported Parameters

### Required Parameters
1. **title** - Main title text (required)

### Optional Parameters  
2. **author** - Author name (optional, auto-capitalized)
3. **logo_path** - Logo file path (optional)
4. **right_image_path** - Right-side image path (optional)
5. **theme** - Theme mode: "dark", "light", "custom" (default: "dark")
6. **custom_template** - Custom background path for custom theme (required when theme="custom")
7. **title_color** - Title text color in hex format (e.g., "#FFFFFF")
8. **author_color** - Author text color in hex format (e.g., "#CCCCCC")  
9. **enable_triangle** - Enable/disable triangle overlay (boolean)
10. **youtube_ready** - Generate YouTube API v3 compliant output (boolean, default: True)

### Theme Defaults
- **Dark Theme**: Black bg + White text (#FFFFFF) + Light gray author (#CCCCCC) + Black triangle
- **Light Theme**: White bg + Black text (#000000) + Dark gray author (#666666) + White triangle
- **Custom Theme**: User background + White text (#FFFFFF) + Light gray author (#CCCCCC) + No triangle

## 🧠 Intelligent Text System

### Core Technology: PNG Overlay + Triangle Integration
Instead of drawing text directly on template:
1. **Independent Rendering**: Generate transparent PNG text images first
2. **Smart Adjustment**: Dynamically adjust PNG size based on text length
3. **Triangle Integration**: Paste triangle to right-side image first, then paste combined image to template
4. **Text Overlay**: PNG text pasted last, ensuring it's always on the top layer

### Chinese/English Differentiated Processing
#### Chinese Optimization
- **Font Enlargement**: 30% larger than English (54px vs 42px title)
- **Smart Line-breaking**: 
  - Title: Break after 9 characters, divide by 2, odd characters go to second line
- **Line Spacing**: Title 16px

#### English Processing
- **Space-based Line-breaking**: Natural word boundary wrapping
- **3-line Limit**: Title max 3 lines, auto-truncate with ellipsis
- **Standard Font**: Lexend Bold
- **Standard Line Spacing**: 8px

## 📝 Input Parameter Details

### Required Parameters
**`title`** (str) - Main title
```python
title="The Ultimate Complete Guide to Advanced AI Technology"
```
- **Smart Line-breaking**: Auto-calculate optimal line-break positions
- **Dynamic Height**: Adjust PNG height based on line count (55px/line + line spacing)
- **Dynamic Font Scaling**: Auto font size based on character count (1-17 chars)
- **Effects**: Clean bold font with theme-based colors
- **Position**: Starting at (55, 330), dynamically centered

### Optional Parameters

**`author`** (str) - Author name
```python
author="Leo Wang"  # Auto-converts to "LEO WANG"
```
- **Format**: Auto-convert to uppercase
- **Position**: Fixed bottom (55, 800)
- **Font**: 36px Lexend Bold, theme-based color

**`logo_path`** (str) - Logo file path
```python
logo_path="logos/your_logo.png"
```
- **Position**: Top-left corner (50, 50), left margin = top margin
- **Area**: 240x150 pixels, auto aspect ratio scaling
- **Format**: Supports PNG/JPG, auto-handle transparency

**`right_image_path`** (str) - Right-side image path
```python
right_image_path="assets/your_image.jpg"
```
- **Smart Cropping**: Auto-convert to square (center crop)
- **Fill Method**: Scale to 900x900 pixels to fill right side
- **Position**: Right area starting at (700, 0)

### Theme & Color Parameters

**`theme`** (str) - Theme mode: "dark", "light", "custom"
```python
theme="dark"     # Default: Black bg + white text + black triangle
theme="light"    # White bg + black text + white triangle  
theme="custom"   # User-provided template + custom colors
```

**`custom_template`** (str) - Custom template path (required for custom theme)
```python
custom_template="path/to/your_template.png"  # Must be 1600x900 PNG
```

**`title_color`** (str) - Title text color in hex format
```python
title_color="#FFFFFF"  # White (dark theme default)
title_color="#000000"  # Black (light theme default)
title_color="#FF0000"  # Red (custom example)
```

**`author_color`** (str) - Author text color in hex format  
```python
author_color="#CCCCCC"  # Light gray (dark theme default)
author_color="#666666"  # Dark gray (light theme default)
author_color="#0000FF"  # Blue (custom example)
```

**`enable_triangle`** (bool) - Enable/disable triangle overlay
```python
enable_triangle=True   # Default for dark/light themes
enable_triangle=False  # Default for custom theme
```

**`youtube_ready`** (bool) - Optimize for YouTube API v3 compliance
```python
youtube_ready=True     # Default: Generate 1280x720 YouTube-compliant thumbnail (2MB max, JPEG, sRGB)
youtube_ready=False    # Generate 1600x900 high-resolution thumbnail
```

## 📦 Installation

The package is officially available on PyPI and can be installed worldwide:

### Quick Install (Recommended)
```bash
pip install youtube-thumbnail-generator
```

### With API Service Support
```bash
pip install "youtube-thumbnail-generator[api]"
```

### Alternative Installation Methods

| Method | Command | Use Case |
|--------|---------|----------|
| **PyPI (Stable)** | `pip install youtube-thumbnail-generator` | Production use, stable releases |
| **PyPI with API** | `pip install "youtube-thumbnail-generator[api]"` | Include Flask API dependencies |
| **GitHub (Latest)** | `pip install git+https://github.com/preangelleo/youtube-thumbnail-generator.git` | Latest development features |
| **Development** | `git clone ... && pip install -e .` | Local development and testing |

### Package Information
- **PyPI Page**: https://pypi.org/project/youtube-thumbnail-generator/
- **Current Version**: 2.2.0
- **License**: MIT
- **Python Support**: 3.7+
- **Dependencies**: Pillow (required), Flask+CORS (optional for API)

### 📦 What's Included Automatically
When you install via PyPI or GitHub, you get everything you need:
- ✅ **All Templates**: Dark, Light, and Custom background templates
- ✅ **Triangle Assets**: Black and white triangle overlays  
- ✅ **Professional Template**: 1600x900 high-quality base template
- ✅ **Font Assets**: Chinese/English optimized fonts
- ✅ **Sample Assets**: Testing logo and image files
- ✅ **Auto Template Creation**: If templates are missing, they're automatically generated in your project directory

**Smart Fallback System**: If bundled templates can't be found (rare edge case), the system automatically creates default templates in your current directory.

**No additional downloads needed** - start generating thumbnails immediately after installation!

## 🚀 Usage Methods

### 1. Use as Python Library

#### Dark Theme (Default - YouTube Ready)
```python
from youtube_thumbnail_generator import FinalThumbnailGenerator, get_default_template

# Initialize generator with bundled template
generator = FinalThumbnailGenerator(get_default_template())

# Generate YouTube-ready thumbnail (1280x720, <2MB, optimized for API upload)
result = generator.generate_final_thumbnail(
    title="Complete AI Technology Guide",  # 5 words - will be enlarged
    author="Leo Wang",
    logo_path="logos/your_logo.png",
    right_image_path="assets/your_image.jpg",
    output_path="outputs/dark_theme_youtube.jpg",
    theme="dark"  # Default theme, youtube_ready=True by default
)
```

#### Light Theme (YouTube Ready)
```python
# Generate Light theme YouTube-ready thumbnail  
result = generator.generate_final_thumbnail(
    title="AI技术指南完整教程",  # 10 Chinese characters - optimal
    author="Leo Wang",
    logo_path="logos/your_logo.png", 
    right_image_path="assets/your_image.jpg",
    output_path="outputs/light_theme_youtube.jpg",
    theme="light",
    title_color="#000000",  # Black text for white background
    author_color="#666666"  # Dark gray author
    # youtube_ready=True by default - 1280x720 YouTube API ready
)
```

#### Custom Theme (YouTube Ready)
```python
# Generate Custom theme YouTube-ready thumbnail
result = generator.generate_final_thumbnail(
    title="Custom Background Demo",  # 4 words - will be enlarged
    author="Your Name",
    logo_path="logos/your_logo.png",
    right_image_path=None,  # No right image needed
    output_path="outputs/custom_theme_youtube.jpg",
    theme="custom",
    custom_template="your_background_1600x900.png",  # Your custom background
    title_color="#FFFFFF",  # White text  
    author_color="#CCCCCC",  # Light gray author
    enable_triangle=False  # No triangle overlay
    # youtube_ready=True by default - optimized for YouTube API
)
```

### 2. Command Line API Service
Launch API directly after installation:

```bash
# Start API service directly
youtube-thumbnail-api

# Or use Python module method
python -m youtube_thumbnail_generator.api_server
```

### 3. YouTube API v3 Ready Thumbnails

Generate thumbnails that are fully compliant with YouTube API v3 upload requirements:

```python
from youtube_thumbnail_generator import FinalThumbnailGenerator, get_default_template

generator = FinalThumbnailGenerator(get_default_template())

# Generate YouTube API v3 compliant thumbnail (default behavior)
result = generator.generate_final_thumbnail(
    title="My YouTube Video Title",
    author="Channel Name", 
    logo_path="my_logo.png",
    right_image_path="video_frame.jpg",
    output_path="my_video_thumbnail.jpg",
    theme="dark"
    # youtube_ready=True by default - outputs 1280x720 JPEG, sRGB, <2MB
)
# Output: Ready for direct YouTube API upload!
```

#### Manual YouTube Optimization
```python
from youtube_thumbnail_generator import optimize_for_youtube_api

# Optimize existing thumbnail for YouTube API
youtube_ready_path = optimize_for_youtube_api(
    input_path="my_large_thumbnail.jpg",
    output_path="my_thumbnail_youtube_ready.jpg"  # Optional
)
# Automatically converts to 1280x720 JPEG, ensures <2MB size
```

#### YouTube API v3 Compliance Features
- **✅ Perfect Dimensions**: 1280x720 pixels (16:9 aspect ratio)
- **✅ Optimal Format**: JPEG with baseline encoding
- **✅ File Size Control**: Automatic compression to stay under 2MB limit
- **✅ Color Space**: sRGB color profile for consistent display
- **✅ Smart Cropping**: Maintains aspect ratio with center cropping
- **✅ Quality Optimization**: Multi-level quality testing (95→90→85→80→75→70)

### 4. Use in Other Python Projects
```python
# In your Python projects
from youtube_thumbnail_generator import FinalThumbnailGenerator, get_default_template, create_text_png

# Quick YouTube-ready thumbnail generation with bundled template
generator = FinalThumbnailGenerator(get_default_template())
result = generator.generate_final_thumbnail(
    title="Your Video Title",
    output_path="output/thumbnail_youtube.jpg"
    # Outputs 1280x720 YouTube API compliant thumbnail by default
)

# Or generate text PNG only
success, text_img, height = create_text_png(
    text="Test Text",
    width=600,
    height=200,
    language="chinese"
)
```

### 5. API Service Calls

#### Generate Thumbnail
```bash
curl -X POST http://localhost:5002/api/generate/enhanced \
  -H "Content-Type: application/json" \
  -d '{
    "title": "Amazing Tech Reviews 2025",
    "author": "Leo Wang",
    "logo_path": "logos/animagent_logo.png",
    "right_image_path": "assets/testing_image.jpeg"
  }'
```

#### Response Example
```json
{
  "task_id": "abc123-def456-ghi789",
  "status": "processing",
  "message": "Thumbnail generation task started"
}
```

#### Check Task Status
```bash
curl http://localhost:5002/api/status/abc123-def456-ghi789
```

#### Download Result
```bash
curl -O http://localhost:5002/api/download/final_test.jpg
```

### 6. Python API Client Example
```python
import requests
import time
import json

def generate_thumbnail_api(title, author=None, logo_path=None, image_path=None):
    """Generate thumbnail using API"""
    
    # 1. Send generation request
    response = requests.post('http://localhost:5002/api/generate/enhanced', 
        headers={'Content-Type': 'application/json'},
        data=json.dumps({
            "title": title,
            "author": author,
            "logo_path": logo_path,
            "right_image_path": image_path
        })
    )
    
    task_data = response.json()
    task_id = task_data['task_id']
    print(f"Task created: {task_id}")
    
    # 2. Poll status until complete
    while True:
        status_response = requests.get(f'http://localhost:5002/api/status/{task_id}')
        status_data = status_response.json()
        
        print(f"Status: {status_data['status']}")
        
        if status_data['status'] == 'completed':
            print(f"Generation complete! Download: {status_data['download_url']}")
            return status_data['download_url']
        elif status_data['status'] == 'failed':
            print(f"Generation failed: {status_data['error']}")
            return None
        
        time.sleep(1)

# Usage example
download_url = generate_thumbnail_api(
    title="My Amazing YouTube Video Title That Is Really Long",
    author="Your Name",
    logo_path="logos/my_logo.png",
    image_path="assets/thumbnail_image.jpg"
)
```

## 🎯 Complete API Endpoint Guide

### Thumbnail Generation
`POST /api/generate/enhanced`

**Request Body**:
```json
{
  "title": "Required - Main title text",
  "author": "Optional - Author name",
  "logo_path": "Optional - Logo file path",
  "right_image_path": "Optional - Right-side image path"
}
```

### Chapter Image Generation  
`POST /api/generate/chapter`

**Request Body**:
```json
{
  "text": "Required - Text to display",
  "language": "Optional - english/chinese",
  "font_size": "Optional - Font size",
  "width": "Optional - Image width, default 1600", 
  "height": "Optional - Image height, default 900"
}
```

### Other Endpoints
- `GET /api/status/<task_id>` - Check task status
- `GET /api/download/<filename>` - Download generated file
- `GET /api/health` - Health check
- `GET /api/templates` - Get available templates
- `GET /api/assets` - Get resource list

## 📊 Smart Layout Examples

### Short Title Effect
```
Title: "Tech News 2025" 
→ 1 line, centered layout, clean appearance
```

### Long Title Effect  
```
Title: "The Ultimate Complete Guide to Advanced AI Technology..."
→ Multiple lines with smart line-breaking
Auto-adjust positions for perfect fit
```

### Overlong Content Handling
```
Title exceeds 3 lines → Auto-truncate with ellipsis
Ensure stable layout, prevent content overflow
```

## 🔧 Advanced Configuration

### Manual Template Creation
If you need to manually create templates in your project directory:

```python
from youtube_thumbnail_generator import init_templates

# This creates a 'templates/' directory with all required files:
# - professional_template.jpg (1600x900 black background)
# - light_template.png (1600x900 white background) 
# - triangle_black.png (200x900 opaque black triangle)
# - triangle_white.png (200x900 opaque white triangle)
init_templates()
```

### Advanced Triangle Customization
For advanced users who want custom triangle effects:

```python
from youtube_thumbnail_generator import generate_triangle_template

# Generate 4 different triangle variants:
generate_triangle_template("black", "bottom")    # Default: point at bottom-left
generate_triangle_template("black", "top")       # Point at top-left  
generate_triangle_template("white", "bottom")    # White, point at bottom-left
generate_triangle_template("white", "top")       # White, point at top-left

# Custom colors and sizes:
generate_triangle_template("#FF0000", "bottom", "red_triangle.png", 300, 900)
generate_triangle_template("#00FF00", "top", "green_triangle_top.png")
```

#### Triangle Options:
- **Colors**: `"black"`, `"white"`, or hex colors like `"#FF0000"`
- **Directions**: `"bottom"` (point at bottom-left), `"top"` (point at top-left)
- **Custom sizes**: width and height in pixels
- **Custom paths**: specify your own output filename

### File Path Rules
- **Relative Paths**: Relative to project root directory
- **Logo Directory**: `logos/` - Store all logo files
- **Assets Directory**: `assets/` - Store background images
- **Output Directory**: `outputs/` - Generated results storage
- **Template Directory**: `templates/` - Template file storage (auto-created if needed)

### Supported Image Formats
- **Input**: PNG, JPG, JPEG (supports transparency)
- **Output**: JPG (high quality, 95% quality)
- **Processing**: Auto color mode conversion

### Font Priority
```
English Fonts:
1. Helvetica (Mac system)
2. Lexend Bold (if installed)
3. Ubuntu Bold (Linux)
4. System default font

Chinese Fonts:
1. Noto Sans CJK Bold
2. Source Han Sans
3. WenQuanYi fonts
```

## 📁 Project Structure
```
youtube_thumbnail_generator/
├── youtube_thumbnail_generator/
│   ├── __init__.py                   # Package initialization
│   ├── final_thumbnail_generator.py  # Core generator
│   ├── text_png_generator.py         # PNG text renderer  
│   ├── api_server.py                 # Flask API service
│   └── function_add_chapter.py       # Chapter functionality
├── templates/
│   ├── professional_template.jpg     # 1600x900 professional template
│   └── triangle_template.png         # 200x900 triangle transition
├── template_samples/                 # Template showcase samples
├── setup.py                          # Package setup
├── pyproject.toml                    # Modern Python packaging
├── README.md                         # Project documentation
└── README_API.md                     # Detailed API documentation
```

## 📈 Version History

### v2.2.2 (Current) - YouTube-Ready by Default
- ✅ **Default YouTube Optimization**: All thumbnails are YouTube API compliant by default
- ✅ **Seamless User Experience**: No extra steps needed for YouTube uploads
- ✅ **Clean File Management**: Optimized files use original filenames
- ✅ **High-Resolution Option**: Use `youtube_ready=False` for 1600x900 images

### v2.2.1 - YouTube API Integration
- ✅ **YouTube API v3 Compliance**: Built-in optimization for YouTube thumbnail uploads
- ✅ **Smart Resource Management**: Package path resolution with automatic fallback template creation
- ✅ **Format Optimization**: 1280x720 JPEG, sRGB color space, <2MB file size control
- ✅ **Quality Control**: Multi-level compression testing for optimal file size
- ✅ **Cross-Platform**: Improved compatibility across Python 3.7+ environments

### v2.2.0 - Three Theme Architecture Revolution
- ✅ **Complete Theme System**: Dark, Light, and Custom modes with full parameterization
- ✅ **Color Customization**: Hex color support for titles and authors
- ✅ **Triangle Control**: Configurable overlay effects per theme
- ✅ **Custom Backgrounds**: User-provided template support

### v2.1 - Smart Layout Revolution
- ✅ **PNG Overlay Technology**: Text rendering separated from template, perfect control
- ✅ **Smart Height Adjustment**: Dynamically adjust layout based on content length
- ✅ **Line Spacing Optimization**: 8px line spacing, improved reading experience
- ✅ **Triangle Transition**: 200x900 diagonal separation, professional visual effects
- ✅ **Truncation Mechanism**: Smart truncation for overlong content, stable layout
- ✅ **Dual API Support**: Thumbnail + Chapter dual-function API
- ✅ **Python Package**: Installable as pip package, use in any Python project

### v1.0 - Basic Functionality
- ✅ Professional template layout design
- ✅ Auto square image conversion  
- ✅ 5-parameter input system
- ✅ Smart font selection
- ✅ Complete text effects
- ✅ Flask API integration

## 🏆 Project Status

### PyPI Distribution
- **📦 Live on PyPI**: https://pypi.org/project/youtube-thumbnail-generator/
- **🌍 Global Install**: `pip install youtube-thumbnail-generator`  
- **📊 Download Stats**: Available on [PyPI Stats](https://pepy.tech/project/youtube-thumbnail-generator)
- **🔖 Latest Version**: 2.2.2
- **📅 Published**: August 2025

### Community & Support
- **⭐ GitHub Stars**: https://github.com/preangelleo/youtube-thumbnail-generator
- **🐛 Issue Tracking**: https://github.com/preangelleo/youtube-thumbnail-generator/issues
- **📖 Documentation**: Complete README and API docs
- **🌐 International**: Full English documentation for global users

## 🎯 Best Practices

### Title Text Suggestions
- **Length**: Recommend 50-100 characters, system auto-optimizes display
- **Content**: Clearly express video theme, attract viewer clicks
- **Keywords**: Front-load important keywords, improve search results


### Image Selection Principles
- **Size**: Any size, system auto-converts to square
- **Content**: Choose visually impactful images
- **Quality**: Recommend high resolution, ensure clarity after scaling

## 🚨 Troubleshooting & Important Notes

### 🔧 Common Issues & Solutions

#### Template Files Not Found
If you encounter `FileNotFoundError` for template files:

**Problem**: Templates missing after PyPI installation or in development.

**Solutions** (try in order):
1. **Automatic Resolution** - The system will automatically create missing templates
2. **Manual Creation**:
   ```python
   from youtube_thumbnail_generator import init_templates
   init_templates()  # Creates all required templates
   ```
3. **Resource Path Check**:
   ```python
   from youtube_thumbnail_generator import get_resource_path
   print(get_resource_path("templates/professional_template.jpg"))
   ```

#### Custom Triangle Effects Not Working
**Problem**: Default triangles don't match your design needs.

**Solution**: Generate custom triangles:
```python
from youtube_thumbnail_generator import generate_triangle_template

# 4 basic variants:
generate_triangle_template("black", "bottom")  # Standard
generate_triangle_template("black", "top")     # Inverted
generate_triangle_template("white", "bottom")  # Light theme
generate_triangle_template("white", "top")     # Light inverted

# Custom colors:
generate_triangle_template("#FF6B35", "bottom", "custom_orange.png")
```

#### YouTube API Upload Failures
**Problem**: Generated thumbnails rejected by YouTube API.

**Check**: Ensure you're using the YouTube-optimized version:
```python
result = generator.generate_final_thumbnail(
    title="Your Title",
    youtube_ready=True  # This is now default - ensures 1280x720, <2MB, sRGB
)

# Or manually optimize existing thumbnails:
from youtube_thumbnail_generator import optimize_for_youtube_api
youtube_path = optimize_for_youtube_api("your_thumbnail.jpg")
```

### 📋 System Requirements & Notes

1. **File Paths**: All paths are automatically resolved with smart fallbacks
2. **Font Dependencies**: System will auto-downgrade to available fonts  
3. **Template Management**: Missing templates are auto-created in your project directory
4. **Output Format**: Default YouTube-ready (1280x720 JPEG), use `youtube_ready=False` for high-res
5. **API Processing**: API uses async processing, poll status for completion
6. **Memory Usage**: Large image processing may use significant memory
7. **Cross-Platform**: Full compatibility across macOS, Linux, and Windows

---

## 💡 Quick Start

1. **Install Package**: `pip install youtube-thumbnail-generator`
2. **Prepare Assets**: Put logos and images in corresponding directories
3. **Direct Test**: 
   ```python
   from youtube_thumbnail_generator import FinalThumbnailGenerator, get_default_template
   generator = FinalThumbnailGenerator(get_default_template())
   generator.generate_final_thumbnail(title="Test Title", output_path="test_youtube.jpg")
   # Generates 1280x720 YouTube-ready thumbnail by default
   ```
4. **API Service**: `youtube-thumbnail-api`
5. **Check Result**: Look at generated file

Start creating professional YouTube thumbnails now! 🎬✨