Dust specks, dust donuts, and co-located dead pixels all constitute dark anomalies and will cause halos around them if not taken care of. These type of dark anomalies are taken care of by masking them out so that Wipe will not sample their pixels.
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Image "Simulated dust speck causing a halo."Image "Mask editor interface with dust speck masked out."Image "Dust speck no longer causing halo."Image "AutoDev interface with image of M101 being stretched."