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| • | Nearest Color — replaces the original color of a pixel with the color in the newly generated palette that is closest to the original RGB value. This method eliminates dithering and produces a high-contrast image. This method works well with most simple graphics. |
| • | Error Diffusion — replaces the original color of a pixel with the most similar color in the palette, but spreads the discrepancy between the original and new colors to the surrounding pixels. As it replaces a color (working from the top left to the bottom right of the image), it adds the "error," or discrepancy, to the next pixel, before selecting the most similar color. This method produces a natural-looking image and often works well for photos or complex graphics. With the Error Diffusion method, you select the Floyd-Steinberg, Burkes, or Stucki algorithm for the dithering pattern. |
| • | Ordered Dither — adjusts adjacent pixels so that two colors give the illusion of a third color and intermingles pixels to produce patterns based on a known palette. You can use this method to give the image the appearance of containing more colors than it actually does. Images may appear to be composed of cross-hatches and dots and may have distinct light and dark areas. |