I have old land-use maps in a scanned format. I am trying to obtain proper land-use maps from it, similar to what is described here: https://gis.stackexchange.com/questions/71650/how-to-compare-areas-in-scanned-historical-land-use-maps . The problem I'm facing is that some of the land-use classes are depicted as pattern (e.g. forests below are green with sprinkled black dots).
My fairly general question is for tips on how to do this in GiMP? I.e. creating an image file, where the patterns are replaced by plain areas in high-contrast colors.