Flat graphical images
To keep flat color areas from dithering while maintaining smoothness in the anti-aliased edges, use colors from the web palette to fill flat color areas when you are designing the image. Do not apply the strict web palette option when saving or exporting because you’ll lose the gradations of color in the anti-aliasing. It is better to choose an Adaptive palette with a Web Snap option, if it is available. In Photoshop, set the amount of web snap with the slider scale. In Fireworks, apply the Web Adaptive palette. This will maintain the web colors in your flat areas but allow some non-web-safe colors in the anti-aliasing and other blends to remain.
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