I have some blobs on a uniform background. I want a tool such that, when I click on an individual blob, it can detect its boundaries from the background, and paint it white. The blobs have distinct boundaries, and are brighter than the background. Then, once I am done with all the blobs, I want to click on the background, and paint it black, i.e. everything that hasn't been labeled as a blob should turn black.
What Ubuntu software would you recommend?
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