Dither
Apply a Riemersma or Floyd-Steinberg error diffusion dither to images when general color reduction is applied via an option, or automagically when saving to specific formats. This enabled by default.
Dithering places two or more colors in neighboring pixels so that to the eye a closer approximation of the images original color is reproduced. This reduces the number of colors needed to reproduce the image but at the cost of a lower level pattern of colors. Error diffusion dithers can use any set of colors (generated or user defined) to an image.
Entries
FloydSteinberg dither reduces an image into a reduced set of colors while attempting to minimize perceptual changes.
Riemersma dither is a novel dithering algorithm that can reduce a grey scale or color image to any color map (also called a palette) and that restricts the influence of a dithered pixel to a small area around it.
Don't use any dither method.
Unset value.