<https://forum.affinity.serif.com/index.php?/topic/130322-halo-on-edge-of-selections/#comment-716820>
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"Just been having another play.  There seem to be ways to reduce the halo, by doing the adjustments in small bites, though not to totally eliminate them.\n \n\n\n\tCan anybody explain exactly what the halo is please?  I understand sharpening halos, but not why there should be a halo at the edge of a selection when the exposure or brightness is changed.  In this image it appears as a green halo, which tends to suggest that it is something to do with the content of the selection.  Does the selection brush do something to the edges?\n \n\n\n\tStill confused.\n \n\n\n\tIan\n "
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