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Production for Print by Mark Gatter

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Pixel Depth in Color Images

The next step up in image complexity is color. There are several different formats of color image (fig. 5.2), and the number of colors they can display depends either on how many channels they comprise or whether they are indexed color, i.e. GIF (graphics interchange format).

GIF images have no place in the printing industry and are strictly for on-screen viewing such as on websites. Indexed color can show a maximum of 256 colors, which can come from anywhere in the entire RGB range, rather than having to be shades of the same hue. If the colors are dithered, i.e. pixels of one color are scattered throughout a patch of another color, they visually merge to create the appearance of a color that is not actually present ...

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