pngquant

Lossy PNG image compressor for reducing file size while preserving quality

brewmacoslinux

Try with needOr install directly

About

PNG image optimizing utility

pngquant

Compress a PNG image to 256 colors with default quality$ pngquant image.png

Compress PNG with specific color count and output file$ pngquant 128 image.png -o optimized.png

Compress all PNG files in a directory with quality range$ pngquant --quality=65-80 *.png