Combination images (flat and photographic areas)
To keep the flat areas from dithering while allowing the continuous tone areas to dither with an Adaptive palette, use web-safe colors in the flat areas when you are designing the image. When it’s time to save or export to GIF format, choose an Adaptive palette with a Web Snap option if it is available. Using the Adaptive or Selective palette preserves the color fidelity in the photographic areas, while the Web Snap option preserves the web-safe colors in the flat areas.
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