: Swap Colors (not Invert them) in Gimp I know how to Invert Colors but is it possible to swap Colors? For example from this one: To this one: So that I select one Area and then swap Colors

@Berryessa866

If you have more than a few, but less than 256 colors, you can work in indexed mode and reverse the ordering of the colors.

This can be done in 3 steps:


duplicate and store palette
reverse ordering of colormap
apply the stored palette


Here a detailed explanation of these 3 steps:


Palettes dialog (Windows -> Dockable dialogs -> Palettes): right click on the current colormap, select "Duplicate Palette", choose a new name (e.g. original palette), and save it.
Rearrange Colormap (Colors -> Map -> Rearrange Colormap): right click, then click on "Reverse order", click ok.
Set Colormap (Colors -> Map -> Set Colormap): click on the Palette and select the palette saved in step 1, click ok.

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@Megan533

If the image has few pixels as this one, and would not suffer loss on being changed to indexed (max. 256 colors), you can edit an image color map directly. That way you could just select the pixels in the color you want to replace, and type a new value for them.

Change the image to indexed in image->mode->indexed, and them open the colormap dialog in windows->dockable dialogs->colormap. Double click on an indexed color to change it.

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@Sent7350415

There is a filter in Photoshop called Selective Color that allows the user to modify multiple colors at the same time, but until 9/18/2014 nothing similar has been implemented in Gimp. The closest tool in Gimp to deal with what you are looking for is the Channel Mixer.

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