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Reference
Glossary
Index ColorProducing images for the Web invariably means minimizing the number of
colors (and therefore the file size), and the index color system is another
step in this squishing process. With a 216-color palette loaded, Photoshop will map an image
to those colors when you move it into index color mode. While this
helps the compression and allows you to choose bit depth, it also makes the
colors dither, or shift numerically, to the palette. One way to compensate
for dithering in the index mode is to use a histogram, which is basically a
bar graph of each color's frequency in the image. In most image-processing
programs, you can manipulate the histogram and determine how much weight to
give certain colors in the resulting palette.
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