Image Optimizer is a Calibre plugin that allows you to batch compress and optimize images within your eBooks (EPUB/ZIP/AZW3/MOBI/CBZ/CBR...) to reduce file size without significant loss of quality.
Why Image Optimizer?
Compared to other plugins like Bulk Image Resizer, this plugin offers:
- Superior Compression: Uses advanced optimization algorithms to achieve significantly smaller output files while maintaining visual fidelity.
- Deep Optimization: While it may take slightly longer to process due to intensive compression techniques, the trade-off is a much more efficient storage reduction.
- Extreme Compatibility: Detects images by "magic bytes" (file headers), allowing it to optimize files even if they have incorrect or missing extensions—something most basic resizers cannot do.
- Modern Format Support: Extends beyond JPG/PNG to support AVIF, WebP, QOI, HDR, and many others.
Features- Batch Processing: Select multiple books and optimize them in one go.
- Smart Detection: Automatically detects image formats based on file content (magic bytes), supporting files even with missing or incorrect extensions.
- Supported Formats: Handles a wide range of formats including JPEG, PNG, WEBP, GIF, BMP, TIFF, ICO, AVIF, QOI, HDR, OpenEXR, DDS, Farbfeld, and PNM.
- Configurable: Set target resolution, quality, and format conversion preferences.
- Non-Destructive: Creates a new book entry with the optimized files, keeping your originals safe.
- Multilingual: Supports English, Vietnamese, and Japanese.
Open source:
https://github.com/tachibana-shin/image_optimizer
Thanks for read