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*'''HOWTO: EDIT PALETTE IN AN INDEXED IMAGE''' --- use the Colormap dialog. Upper right of the interface is the dockable dialogs where you will see small tabs each to a dockable dialog. One of the dockable dialogs is Colormap, the tab symbol being four squares of colors. If the dockable dialog is not present goto WINDOWS -> DOCKABLE DIALOGS -> colormap. In the colormap dockable dialog click the color square to edit the color in the palette of the indexed image.