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Dither

dither

The mixing of adjacent pixels to simulate additional colors to fill the gaps between two colors. For instance, if you want to display a full color graphic on a 256-color monitor, the computer will simulate the colors he cannot display. If there is a part in an image that displays incorrectly because a red and a yellow pixel are lying next to each other, creating a definite line from a distance, dithering would put an orange pixel in between to smooth out the line and the colors.