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Troubleshooting

Correcting Banding in Images

My images are starting to look like targets at a bow-and-arrow convention. The concentric circles in areas that should be gradients are driving me crazy. What's wrong?

You're experiencing banding. The reduction in the number of colors results in grouping of several colors into one. For example, in a 24-bit image, a certain area might transition from light red to medium red to dark red. With a reduction of colors, it all becomes medium red. If the original transition were actually “dark purple—medium purple—light purple—light red—medium red—dark red,” the result could be medium purple and medium red side-by-side. The visible banding created by two dissimilar colors next to each other can be eased with dithering. Dithering uses dots and/or patterns of the two colors in differing densities to simulate shades between the colors. Save for Web offers options and controls for dithering.


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