Pixel-Zip is a raster image compressor and decompressor designed specifically for the graphic arts and related markets with especially developed large file, 16-bit and native CMYK mode compression support with algorithms tailored at maximum colour and quality retention.

You may not know this, but many similar technologies in the market actually convert CMYK images into RGB, compress and store this RGB data and then decompress and convert RGB back to CMYK, distorting and changing colour