File > GIF Quality
GIF Quality
The GIF Quality command allows you to save the file in GIF format.
    
Dithering = 0Dithering = 8
1. Choose File > GIF Quality
2. Use the following options:
 Threshold
Sets the transparency threshold. Pixels with an alpha value less than the selected value will be fully transparent.

Min = 0, Max = 255, Default = 128.
 Dithering
This option allows you to set the dithering level. Dithering allows you to create colors that do not actually exist in the image's color palette.

Min = 0, Max = 8, Default = 7.
Using Preview Windows
Favorites and History
Related Information
File > JPG Quality
Search the Internet