1. Select options for GIF:
• Palette: try different ones see definitions below.
Type of Palettes:
• Dither: Dither=simulates for 8-bit monitor; larger size; Diffusion=subtle & small.
System (Mac OS or Windows) - Use if it will only be viewed on that platform.
Web - Use for web viewing (216 common colors on Web browsers); Shifts image colors to closest in web palette; least colors, smallest file, not best image quality.
Custom - Create your own palette using the color picker.
Perceptual - Generates a color table based on colors in the image, with attention to how humans actually perceive color; Perserves overall color integrity.
Selective - Generates a color table based on colors in the image, preserves flat colors and Web-safe colors.
Adaptive - Generates a color table based on the part of spectrum most used in the image (larger file).
• Dither %: high=better but bigger.
• Max # Colors: Web defaults.
• Transparency= preserves transparency.
To make an image have transparency you must have parts of the image transparent already.
• Matte: controls partially transparent pixels:
Set to bkgd color of page -or- None = jagged edge. Either will eliminate HALO effects.
Soft edge effects = Matte color. EX: the Matte = color of a Drop Shadow.
• Check Interlaced Box = shows overview and sharpens up images - adds to file size.
• Web Snap%: range of colors that snap to Web-safe equivalent (High=small, dither)
• Adjust Lossy value: reduces size, but will lose some info.
2. File > Save Optimized; name it (all lowercase); It will give you the .gif extension by default.
3. Optional To Save the Settings you've created: Save Settings > name.irs (save to Z: in Optimize folder)/