Sun - Java Look and Feel Design Guidelines, 2nd Edition made by dotneter@teamfly reserved color sets of different platforms, so reserved colors are not guaranteed to reproduce without dithering across platforms. Select colors that do not overwhelm the content of your application or distract users from their tasks. Stay away from saturated hues. For the sake of visual appeal and ease of use, choose groups of muted tones for your interface elements. Since there is no lowest-common-denominator solution for choosing common colors across platforms (or even colors that are guaranteed to reproduce on a single platform), some of the colors in your application graphics will dither when running in 8-bit color. The best strategy is to design images that dither gracefully, as described in the following section. Maximizing Color Quality Images with fine color detail often reproduce better on 8-bit systems than those images that are mapped to a predefined palette (such as the web-safe palette) and use large areas of solid colors. Dithering is less noticeable in small areas, and, for isolated pixels of a given color, dithering simply becomes color substitution. Often colors in the system palette can provide a fair-to-good match with those specified in a GIF file. The overall effect of color substitution in small areas can be preferable to the dithering patterns produced for single colors, or to the limited number of colors resulting from pre-mapping to a given color palette. There are no absolutely safe cross-platform colors. Areas of solid color often dither, producing distracting patterns. One effective way to avoid coarse dithering patterns is to “pre-dither” your artwork intentionally. This approach minimizes obvious patterned dithering on 8-bit systems while still permitting very pleasing effects on systems capable of displaying more than 256 colors. To achieve this effect, overlay a semitransparent checkerboard pattern on your graphics. The following figure shows how to build a graphic using this technique. Figure 43 Adding a Pattern to Avoid Coarse Dithering Patterns
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