Pngquant
pngquant is an open source image optimization utility for lossy compression of PNG files. It reduces file sizes by converting images to a more efficient 8-bit PNG format while preserving transparency and retaining good visual quality.
png
compression
optimization
graphics
image-processing
pngquant: Open Source PNG Image Optimization Utility
pngquant is an open source image optimization utility for lossy compression of PNG files. It reduces file sizes by converting images to a more efficient 8-bit PNG format while preserving transparency and retaining good visual quality.
What is Pngquant?
pngquant is an open source command-line utility for optimizing PNG images by lossily reducing their color palettes to the most common 256 colors. It was designed to achieve maximum file size reduction while preserving full alpha transparency and perceptual visual quality.
pngquant works by analyzing images and selecting colors that are visually important. It then maps similar colors from the original to the new reduced palette. This technique allows it to reduce the PNG file size significantly without noticeably changing the way images look. The utility was created with the aim of providing the best lossy PNG compression ratios out of any existing tools.
Some key features and capabilities of pngquant include:
- Typically achieves 40-70% size reductions with hardly visible difference
- Preserves 8-bit transparency (alpha channel) perfectly
- Supports all PNG types, including animated PNGs
- Retains metadata like color profiles or text chunks when possible
- Open source with versions for Linux, Mac and Windows
- Can be used for batch optimization of multiple images
- Offers various command line options to control compression level, speed, etc.
In summary, pngquant is a versatile and widely-used utility for lossily optimizing PNG images with high efficiency and visual quality.
Pngquant Features
Features
- Lossy compression of PNG files
- Reduces file size by converting to more efficient 8-bit PNG format
- Preserves transparency
- Retains good visual quality
- Open source command-line utility
Pricing
- Open Source
Pros
Significantly reduces PNG file sizes
Lossy compression is reversible
Simple command-line interface
Cross-platform
Free and open source
Cons
Lossy compression leads to some quality loss
Limited to optimizing PNG files only
No GUI available
Requires some technical knowledge to use
Official Links
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