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» Home » Graphics What
is Index Color Mode?
The objective in web graphics is to reduce file size as much as possible while not abandoning image quality. One wants smaller images so they will download to a browser quickly. Index color images are created from RGB images. RGB images can contain up to 16-million colors. When an image is converted to index color, the 16-million colors are converted to 256. This color reduction can create some image distortions as well as some banding (less-than-smooth gradations). Index color makes use of something called dithering. Dithering is the process of using a few colors to create the illusion of more colors (not unlike the dot patterns used in CMYK printing). The attractive thing about index color mode is that 256 colors is the maximum the color mode can contain. It can contain less (between two and 256). With care, a designer can subtract colors from a graphic file so that it looks like a full-color image while containing far fewer colors with little quality loss. When dealing with index color, it's important for a designer to keep
in mind that, once an image's colors are reduced, those colors are gone
for good. If a 16-color, index color image is converted back to full-color,
RGB mode, the image file size will increase but the quality won't improve.
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