PeachImage
PeachImage.Formats.Png.PngEncoderOptions
PngEncoderOptions.Dither Property
Whether to apply Floyd-Steinberg error-diffusion dithering when mapping pixels down to an indexed palette. Only makes a visible difference once quantization is actually lossy (i.e. Indexed with a source that has more than MaxColors distinct colors). Default false.
public bool Dither { get; init; }