Bump version to 0.9rc2

- Improved documentation with optimization levels
- Updated version history
- Fixed aspect ratio in PDF output

README.md

@@ -10,10 +10,11 @@ A command-line tool for processing and cleaning scanned musical score PDFs. This
 - **PNG Optimization**: Optimize PNG files using optipng (if installed)
 - **Modular Processing**: Process your files step by step or all at once
 - **High Quality Output**: Preserve image quality throughout the process
+- **Professional PDF Output**: Generate A4-sized PDFs with proper borders and centered content
 
 ## Installation
 
-1. Ensure you have Python 3.8+ installed
+1. Ensure you have Python 3.12+ installed
 2. Install uv (recommended) or pip
 3. Clone this repository:
    ```bash
@@ -55,15 +56,20 @@ Automatically detects and corrects page rotation by analyzing staff lines.
 
 ### Optimize Pages
 ```bash
-./pdf_cleaner.py optimize
+./pdf_cleaner.py optimize [--level {1,2,3}]
 ```
-Trims excess white space and optionally runs PNG optimization (requires optipng).
+Processes pages with different optimization levels:
+- Level 1: Only trims excess white space
+- Level 2: Trims white space and converts to 1-bit monochrome
+- Level 3: All optimizations + PNG optimization (requires optipng)
+
+Default level is 1 if not specified.
 
 ### Create Final PDF
 ```bash
 ./pdf_cleaner.py finalize output.pdf
 ```
-Combines all processed pages into a final PDF and cleans up temporary files.
+Combines all processed pages into a final PDF with proper A4 sizing, borders, and centered content.
 
 ### Typical Workflow
 ```bash
@@ -83,7 +89,10 @@ Combines all processed pages into a final PDF and cleans up temporary files.
 3. **Optimization**:
    - Detects content boundaries and removes excess white space
    - Optionally runs optipng for additional file size reduction
-4. **Finalization**: Combines processed images back into a PDF using img2pdf
+4. **Finalization**: 
+   - Combines processed images into a professional A4-sized PDF
+   - Adds configurable borders around content
+   - Centers content on each page while maintaining aspect ratio
 
 ## Dependencies
 
@@ -100,4 +109,15 @@ Contributions are welcome! Please feel free to submit a Pull Request.
 
 ## License
 
-[Insert chosen license here]
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.
+
+## Version History
+
+- v0.9rc2: Second release candidate
+  - Improved documentation
+  - Added optimization level descriptions
+  - Fixed aspect ratio in PDF output
+- v0.9rc1: First release candidate with full functionality
+  - Professional PDF output with A4 sizing and borders
+  - Complete image processing pipeline
+  - Configurable settings