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Thread: Upscale a grayscale map and force palette to 3 colors

  1. #1

    Default Upscale a grayscale map and force palette to 3 colors

    I have a low resolution map from a pdf and I want to use GIMP to standardize the grid at 50 px squares(no problem here) and turn the dark colors to black lighter grays to white and middle of the road grays to gray. I have made the 3 color palette, but it is not included in the selection for Image-->Mode-->Indexed Mode. So, how do I accomplish this?
    The end goal is to then change the black to a rock like texture and the white to some dirt/cave floor texture to make it stand out in a VTT.

  2. #2
    Guild Master Gracious Donor Midgardsormr's Avatar
    Join Date
    Aug 2007
    Los Angeles, CA


    I'm not a Gimp user, but if you have a gradient overlay filter or effect, that would probably be the way I'd do it. Set up a gradient with your three desired colors and no interpolation (so that there is a sharp dividing line between each color). Then it's just a matter of moving the divisions around so that they hit the values you want.
    Bryan Ray, visual effects artist

  3. #3
    Guild Novice
    Join Date
    Aug 2010


    Try this: Make your three-color palette active, then Colors>Map>Palette Map.

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