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I'm using GIMP to label data in an image, for a machine learning application. I simply want to divide the image into five colors, and I'm using the selection tool (Scissors Select) to outline the various regions. My question is, if I outline one region, and paint it red, how can I use the top border of this previously selected region to be the bottom border of a new region? (Let's say I will paint this new region blue.)

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  1. with the Red selection still there: Select>Save to channel
  2. make a selection for Blue, with some overlap with Red
  3. open the Channels list, right click the saved selection, and choose Subtract from selection. This will remove from your current Blue selection the bit that was in the Red selection.

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