A modern desktop application for advanced grayscale image conversion, batch processing, and export, supporting high bit-depth, color profiles, and multiple formats.

• Single Image & Batch Processing: Convert one or many images at once.
• Multiple Grayscale Modes: BT.709, L*a*b* (L*), HSL (Lightness), HSV (Value), BT.601, BT.2100, Gamma.
• High Bit-Depth Support: 8-bit and 16-bit grayscale output.
• Alpha Channel Handling: Preserve transparency for supported formats.
• Advanced Export Options: Choose format, bit depth, color profile, DPI, and metadata handling.
• Drag & Drop: Quickly add files for batch processing.
• Clipboard Support: Load images directly from the clipboard.
• Modern UI: Built with CustomTkinter.

• PNG (8/16-bit, with/without alpha)
• TIFF (8/16-bit, with/without alpha)
• JPEG
• WEBP
• BMP
• HEIC/HEIF (if pillow-heif is installed)

• Python 3.8+
• Windows OS (tested)
• CustomTkinter
• Pillow
• numpy
• tifffile
• imageio
• opencv-python-headless
• pillow-heif (optional, for HEIC/HEIF)
• tkinterdnd2

Install all dependencies:

pip install -r requirements.txt

customtkinter
Pillow
numpy
tifffile
imageio
opencv-python-headless
pillow-heif
tkinterdnd2

1. Run the application:

   python main.py

2. Use the UI to load images, select conversion mode, and export.
3. For batch processing, add files and select an output folder.

You can generate a standalone Windows executable using PyInstaller. A build script and a spec file are provided.

Run the provided batch script from the build_scripts folder:

cd build_scripts
./build.bat

This will install dependencies, build the executable, and place it in the main directory.

Alternatively, you can build manually with PyInstaller:

pip install -r requirements.txt
pip install pyinstaller
pyinstaller --onefile --windowed --name "PrecisionGrayscaleConverter" --icon=icon.ico main.py

The executable will be found in the dist folder.

An NSIS installer script is provided in build_scripts/installer.nsi. After building the executable, use NSIS to generate an installer:

1. Download and install NSIS.
2. Open installer.nsi in the NSIS compiler.
3. Compile to create a Windows installer .exe.

• 16-bit PNG with alpha is not supported (alpha will be discarded).
• For HEIC/HEIF support, install pillow-heif.
• ICC profiles are loaded from the Windows system color folder if available.

MIT License

Enhanced Precision Grayscale Converter — by [Jayesh]