This dialog is used to load and save the 256 color palette of the document.
You can call it from the Tools / Color Palette menu.
The Color Palette dialog in Windows:
The Color Palette dialog in Mac OS X:
The square area with 256 color cells represents the current palette. By clicking a the cell you can call the Color dialog and choose a new color for that cell.
Load palette - loads the new color scheme of the document from a palette file (.pal).
Save palette - saves the new color scheme of the document in a palette file (.pal).