pngquant is a command-line utility and a library for lossy compression of PNG images.
The conversion reduces file sizes significantly (often as much as 70%) and preserves full alpha transparency. Generated images are compatible with all web browsers and operating systems.
pngquant is free and open source software.
- High-quality palette generation using a combination of vector quantization algorithms.
- Advanced quantization algorithm with support for gamma correction and premultiplied alpha
- Unique adaptive dithering algorithm that adds less noise to images than the standard Floyd-Steinberg.
- Configurable quality level.
- Automatically finds required number of colors and can skip images which can’t be converted with the desired quality
- Easy to integrate with shell scripts, GUIs and server-side software. It’s based on a portable libimagequant library.
- Fast mode for real-time processing/large numbers of images.
- Multicore support (via OpenMP) and Intel SSE optimizations.
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