Update README version history for v0.9rc3

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

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2024 Kessinen
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

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 +109,19 @@ 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
+
+- v0.9rc3: Third release candidate
+  - Switched to parallel processing in optimization
+  - Removed unused imports and variables
+  - Added `ruff` as a development dependency
+- 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

pdf_cleaner.py

@@ -1,11 +1,22 @@
-import os
 #!/usr/bin/env -S uv run
+
+import os
+import subprocess
 import click
 import cv2
-import numpy as np
-from PIL import Image
-from pdf2image import convert_from_path
 import img2pdf
+import numpy as np
+from pdf2image import convert_from_path
+
+import settings
+from PIL import Image
+import concurrent.futures
+
+class Settings:
+    TRIM_PADDING_PIXELS = 20
+    MONOCHROME_THRESHOLD = 127
+    OPTIPNG_OPTIMIZATION_LEVEL = 7
+    PDF_BORDER_SIZE = 50
 
 def ensure_temp_dir():
     """Ensure temporary directory exists and return its path."""
@@ -37,12 +48,95 @@ def extract(input_pdf):
     
     # Save each page
     for i, page in enumerate(pages):
+        # Convert to grayscale
+        page = page.convert('L')
+        
         output_path = os.path.join(temp_dir, f"page_{i:03d}.png")
+        
+        # Save initial version
+        page.save(output_path, "PNG", optimize=False)
+        
+        # Trim whitespace
+        trim_whitespace(output_path)
+        
+        # Reload the trimmed image
+        page = Image.open(output_path)
+        
+        # Calculate new height maintaining aspect ratio
+        width = 2048
+        ratio = width / page.width
+        height = int(page.height * ratio)
+        
+        # Resize using Lanczos
+        page = page.resize((width, height), Image.Resampling.LANCZOS)
+        
+        # Save final version
         page.save(output_path, "PNG", optimize=False)
         print(f"Saved page {i+1}/{len(pages)}")
     
     print(f"Extracted {len(pages)} pages to {temp_dir}/")
 
+def trim_whitespace(image_path: str, is_final: bool = False) -> bool:
+    """Remove white space from around the image.
+    
+    Handles both RGB and RGBA images, treating transparent pixels as white.
+    
+    Args:
+        image_path: Path to the image file
+        is_final: Whether this is the final operation on the image
+    
+    Returns:
+        bool: True if successful, False otherwise
+    """
+    try:
+        # Open image with PIL
+        image = Image.open(image_path)
+        
+        # If image has transparency, flatten it first
+        if image.mode == 'RGBA':
+            # Create a white background
+            background = Image.new('RGB', image.size, 'white')
+            # Paste using alpha channel as mask
+            background.paste(image, mask=image.split()[3])
+            image = background
+            
+        # Convert to grayscale
+        image = image.convert('L')
+        
+        # Threshold to make all light pixels white and everything else black
+        # This helps with finding content bounds
+        image = image.point(lambda x: 255 if x > 250 else 0)
+        
+        # Invert so content is white on black background
+        image = Image.eval(image, lambda x: 255 - x)
+        
+        # Get the bounding box of content (now white pixels)
+        bbox = image.getbbox()
+        if not bbox:
+            print(f"Warning: No content found in {image_path}")
+            return False
+        
+        # Add padding
+        padding = settings.TRIM_PADDING_PIXELS
+        width, height = image.size
+        x1, y1, x2, y2 = bbox
+        x1 = max(0, x1 - padding)
+        y1 = max(0, y1 - padding)
+        x2 = min(width, x2 + padding)
+        y2 = min(height, y2 + padding)
+        
+        # Open original image again and crop it using the bounds
+        original = Image.open(image_path)
+        cropped = original.crop((x1, y1, x2, y2))
+        
+        # Save the cropped image, optimizing only if this is the final operation
+        cropped.save(image_path, "PNG", optimize=is_final)
+        return True
+        
+    except Exception as e:
+        print(f"Error processing {image_path}: {str(e)}")
+        return False
+
 @cli.command()
 def deskew():
     """Deskew all pages in temporary directory."""
@@ -117,6 +211,169 @@ def deskew():
         else:
             print("  No line segments detected")
 
+def convert_to_monochrome(image_path: str, is_final: bool = False) -> bool:
+    """Convert image to 1-bit monochrome.
+    
+    Handles RGBA images by converting transparent pixels to white before thresholding.
+    
+    Args:
+        image_path: Path to the image file
+        is_final: Whether this is the final operation on the image
+    
+    Returns:
+        bool: True if successful, False otherwise
+    """
+    try:
+        # Open image with PIL
+        image = Image.open(image_path)
+        
+        # Convert to RGBA if not already
+        if image.mode != 'RGBA':
+            image = image.convert('RGBA')
+        
+        # Get the image data as a list of pixels
+        data = image.getdata()
+        
+        # Create new image data, replacing transparent pixels with white
+        new_data = []
+        for item in data:
+            # If pixel is transparent (alpha < 128), make it white
+            if item[3] < 128:
+                new_data.append((255, 255, 255, 255))
+            else:
+                new_data.append(item)
+        
+        # Create new image with modified data
+        image.putdata(new_data)
+        
+        # Convert to grayscale
+        image = image.convert('L')
+        
+        # Convert to 1-bit using threshold
+        image = image.point(lambda x: 255 if x > settings.MONOCHROME_THRESHOLD else 0, '1')
+        
+        # Save the monochrome image, optimizing only if this is the final operation
+        image.save(image_path, "PNG", optimize=is_final)
+        return True
+        
+    except Exception as e:
+        print(f"Error converting to monochrome {image_path}: {str(e)}")
+        return False
+
+def check_optipng_installed() -> bool:
+    """Check if optipng is installed."""
+    try:
+        result = subprocess.run(['optipng', '-v'], capture_output=True, text=True)
+        return result.returncode == 0
+    except FileNotFoundError:
+        return False
+
+def run_optipng(file_path: str) -> bool:
+    """Run optipng on a file with error handling.
+    
+    Returns:
+        bool: True if successful, False otherwise
+    """
+    try:
+        subprocess.run(
+            ['optipng', f'-o{settings.OPTIPNG_OPTIMIZATION_LEVEL}', file_path],
+            capture_output=True,
+            text=True,
+            check=True
+        )
+        return True
+    except subprocess.CalledProcessError as e:
+        print(f"Error optimizing {file_path}: {e.stderr}")
+        return False
+    except Exception as e:
+        print(f"Unexpected error optimizing {file_path}: {str(e)}")
+        return False
+
+@cli.command()
+@click.option('--level', type=click.IntRange(1, 3), default=1,
+              help='Optimization level: 1=trim, 2=monochrome, 3=full with optipng')
+def optimize(level):
+    """Optimize images with specified level of processing.
+    
+    Optimization Levels:
+        1: Only trim whitespace
+        2: Level 1 + convert to 1-bit monochrome
+        3: Level 2 + optipng optimization
+    """
+    temp_files = get_temp_files()
+    if not temp_files:
+        print("No pages found in temporary directory. Run 'extract' first.")
+        return
+    
+    opt_level = settings.OptimizationLevel(level)
+    
+    total_files = len(temp_files)
+    successful = {
+        'trim': 0,
+        'monochrome': 0,
+        'optipng': 0
+    }
+    
+    print(f"Processing {total_files} images at optimization level {level}...")
+    
+    # Step 1: Convert to monochrome if level >= 2
+    if int(opt_level) >= int(settings.OptimizationLevel.MONOCHROME):
+        print("\nConverting to monochrome...")
+        with concurrent.futures.ThreadPoolExecutor() as executor:
+            futures = {executor.submit(convert_to_monochrome, file_path, (opt_level == settings.OptimizationLevel.MONOCHROME)): file_path for file_path in temp_files}
+            for future in concurrent.futures.as_completed(futures):
+                file_path = futures[future]
+                try:
+                    if future.result():
+                        successful['monochrome'] += 1
+                        print(f"Converted {os.path.basename(file_path)}")
+                    else:
+                        print(f"Failed to convert {os.path.basename(file_path)}")
+                except Exception as exc:
+                    print(f"{os.path.basename(file_path)} generated an exception: {exc}")
+    
+    # Step 2: Always trim whitespace
+    print("\nTrimming whitespace from images...")
+    with concurrent.futures.ThreadPoolExecutor() as executor:
+        futures = {executor.submit(trim_whitespace, file_path, (opt_level == settings.OptimizationLevel.TRIM)): file_path for file_path in temp_files}
+        for future in concurrent.futures.as_completed(futures):
+            file_path = futures[future]
+            try:
+                if future.result():
+                    successful['trim'] += 1
+                    print(f"Trimmed {os.path.basename(file_path)}")
+                else:
+                    print(f"Failed to trim {os.path.basename(file_path)}")
+            except Exception as exc:
+                print(f"{os.path.basename(file_path)} generated an exception: {exc}")
+    
+    # Step 3: Run optipng if level = 3
+    if opt_level == settings.OptimizationLevel.FULL:
+        if check_optipng_installed():
+            print("\nOptimizing PNG files with optipng...")
+            with concurrent.futures.ThreadPoolExecutor() as executor:
+                futures = {executor.submit(run_optipng, file_path): file_path for file_path in temp_files}
+                for future in concurrent.futures.as_completed(futures):
+                    file_path = futures[future]
+                    try:
+                        if future.result():
+                            successful['optipng'] += 1
+                            print(f"Optimized {os.path.basename(file_path)}")
+                        else:
+                            print(f"Failed to optimize {os.path.basename(file_path)}")
+                    except Exception as exc:
+                        print(f"{os.path.basename(file_path)} generated an exception: {exc}")
+        else:
+            print("\nNote: optipng not found. Skipping PNG optimization.")
+    
+    # Print summary
+    print("\nOptimization complete!")
+    print(f"Successfully trimmed: {successful['trim']}/{total_files} images")
+    if int(opt_level) >= int(settings.OptimizationLevel.MONOCHROME):
+        print(f"Successfully converted to monochrome: {successful['monochrome']}/{total_files} images")
+    if opt_level == settings.OptimizationLevel.FULL and check_optipng_installed():
+        print(f"Successfully optimized with optipng: {successful['optipng']}/{total_files} images")
+
 @cli.command()
 @click.argument('output_pdf', type=click.Path())
 def finalize(output_pdf):
@@ -129,9 +386,21 @@ def finalize(output_pdf):
     
     print(f"Combining {len(temp_files)} pages into {output_pdf}...")
     
-    # Convert to PDF
+    # A4 size in millimeters
+    A4_WIDTH_MM = 210
+    A4_HEIGHT_MM = 297
+    
+    # Convert to PDF with border
     with open(output_pdf, "wb") as f:
-        f.write(img2pdf.convert(temp_files))
+        f.write(img2pdf.convert(
+            temp_files,
+            with_pdfrw=True,
+            layout_fun=img2pdf.get_layout_fun(
+                pagesize=(img2pdf.mm_to_pt(A4_WIDTH_MM), img2pdf.mm_to_pt(A4_HEIGHT_MM)),
+                border=(settings.PDF_BORDER_SIZE,) * 4,  # Same border size for all sides (top, right, bottom, left)
+                fit=img2pdf.FitMode.into
+            )
+        ))
     
     # Clean up temporary files
     print("Cleaning up temporary files...")

pyproject.toml

@@ -1,10 +1,19 @@
 [project]
 name = "notes-cleaner"
-version = "0.1.0"
+version = "0.9rc3"
 description = "Add your description here"
 readme = "README.md"
+license = "MIT"
+authors = [
+    { name = "Kessinen" }
+]
 requires-python = ">=3.12"
 dependencies = [
     "click>=8.1.7",
     "pydantic>=2.10.3",
 ]
+
+[dependency-groups]
+dev = [
+    "ruff>=0.8.1",
+]

settings.py

@@ -0,0 +1,37 @@
+"""Configuration settings for the PDF Musical Score Cleaner."""
+
+import os
+import multiprocessing
+from enum import IntEnum
+
+class OptimizationLevel(IntEnum):
+    """Optimization levels for image processing.
+    
+    Levels:
+        1: Only trim whitespace
+        2: Trim + convert to 1-bit monochrome
+        3: All optimizations + optipng
+    """
+    TRIM = 1  # Only trim whitespace
+    MONOCHROME = 2  # Trim + convert to 1-bit monochrome
+    FULL = 3  # All optimizations + optipng
+
+# Number of parallel processes to use for operations that support parallelization
+# Defaults to number of CPU cores - 1, but never less than 1
+DEFAULT_PARALLEL_PROCESSES = max(1, multiprocessing.cpu_count() - 1)
+
+# Can be overridden by environment variable
+PARALLEL_PROCESSES = int(os.getenv('NOTES_CLEANER_PARALLEL_PROCESSES', DEFAULT_PARALLEL_PROCESSES))
+
+# Border size in pixels for the final PDF output
+PDF_BORDER_SIZE = 50
+
+# Optimization settings
+OPTIPNG_OPTIMIZATION_LEVEL = int(os.getenv('NOTES_CLEANER_OPTIPNG_LEVEL', '7'))  # 0-7, higher = better compression but slower
+TRIM_PADDING_PIXELS = int(os.getenv('NOTES_CLEANER_TRIM_PADDING', '20'))  # Padding around content after trimming
+
+# Image processing settings
+MONOCHROME_THRESHOLD = int(os.getenv('NOTES_CLEANER_MONO_THRESHOLD', '200'))  # 0-255, higher = more white
+
+# Temporary directory settings
+TEMP_DIR_PREFIX = 'notes_cleaner_'

uv.lock

@@ -33,19 +33,27 @@ wheels = [
 
 [[package]]
 name = "notes-cleaner"
-version = "0.1.0"
+version = "0.9rc2"
 source = { virtual = "." }
 dependencies = [
     { name = "click" },
     { name = "pydantic" },
 ]
 
+[package.dev-dependencies]
+dev = [
+    { name = "ruff" },
+]
+
 [package.metadata]
 requires-dist = [
     { name = "click", specifier = ">=8.1.7" },
     { name = "pydantic", specifier = ">=2.10.3" },
 ]
 
+[package.metadata.requires-dev]
+dev = [{ name = "ruff", specifier = ">=0.8.1" }]
+
 [[package]]
 name = "pydantic"
 version = "2.10.3"
@@ -99,6 +107,31 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/df/c3/b15fb833926d91d982fde29c0624c9f225da743c7af801dace0d4e187e71/pydantic_core-2.27.1-cp313-none-win_arm64.whl", hash = "sha256:45cf8588c066860b623cd11c4ba687f8d7175d5f7ef65f7129df8a394c502de5", size = 1882983 },
 ]
 
+[[package]]
+name = "ruff"
+version = "0.8.1"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/95/d0/8ff5b189d125f4260f2255d143bf2fa413b69c2610c405ace7a0a8ec81ec/ruff-0.8.1.tar.gz", hash = "sha256:3583db9a6450364ed5ca3f3b4225958b24f78178908d5c4bc0f46251ccca898f", size = 3313222 }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/a2/d6/1a6314e568db88acdbb5121ed53e2c52cebf3720d3437a76f82f923bf171/ruff-0.8.1-py3-none-linux_armv6l.whl", hash = "sha256:fae0805bd514066f20309f6742f6ee7904a773eb9e6c17c45d6b1600ca65c9b5", size = 10532605 },
+    { url = "https://files.pythonhosted.org/packages/89/a8/a957a8812e31facffb6a26a30be0b5b4af000a6e30c7d43a22a5232a3398/ruff-0.8.1-py3-none-macosx_10_12_x86_64.whl", hash = "sha256:b8a4f7385c2285c30f34b200ca5511fcc865f17578383db154e098150ce0a087", size = 10278243 },
+    { url = "https://files.pythonhosted.org/packages/a8/23/9db40fa19c453fabf94f7a35c61c58f20e8200b4734a20839515a19da790/ruff-0.8.1-py3-none-macosx_11_0_arm64.whl", hash = "sha256:cd054486da0c53e41e0086e1730eb77d1f698154f910e0cd9e0d64274979a209", size = 9917739 },
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