Eraser Tool that allows pixel by pixel erasing of Fog of War and images

In the West Marches campaign I'm in, the DM team is using a "hand drawn" map instead of a hex or grid based map. To build the map for players as they explore, we've uploaded a png for every brush we used to make the map. As players explore, we drop the images onto their map. Thing is, sometimes the DM map - which was made in GIMP - didn't use the full "mountains1.png" image but just part of it, so it'd be nice if we could erase the part we weren't using. Similarly, I'd love to be able to erase the Fog of War more finely. Thanks.

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