You can edit both the global and local palettes by using the "Edit Color Palette" dialog box . Note the following when editing a palette.
If you edit a global palette, the quality of every image that uses the global palette (any image that does not use a local palette) may decrease.
If you edit a palette many times, the quality of the images that use that palette will decrease.
Therefore, edit a palette only when absolutely necessary. In general, set the use of a local palette whenever you insert an image. When you ultimately want to reduce the file size, switch the palette to the global palette.
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