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nQuant

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nQuant is a .net color quantizer producing high quality 256 color 8 bit PNG images using an algorithm optimized for the highest quality possible.

colorquant - Go library for color quantization and dithering

  •    Go

Colorquant is an image / color quantization library written in Go. It can be considered as a replacement for the quantization and dithering part of the draw method from the core image library for various reasons (see below). The purpose of color quantization is to reduce the color palette of an image to a fraction of it's initial colors (usually 256), but to preserve it's representative colors and to elliminate visual artifacts at the same time. Even with the best set of 256 colors, there are many images that look bad. They have visible contouring in regions where the color changes slowly.