<https://forum.affinity.serif.com/index.php?/topic/130322-halo-on-edge-of-selections/#comment-716834>
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"Thanks Chris.  I'm surprised if it is CA, as I don't normally get that with this lens.\n \n\n\n\tI think I have answered my own question about the green halo.  In that experiment I had been adjusting the contrast, so the halo was probably edge detection for that adjustment.\n \n\n\n\tIn my latest experiment I have done away with the selection brush.  Instead, I adjusted the exposure of the entire image and then used the paintbrush to remove the adjustment from the sky area.  In close up there is no halo, though there is the tiniest purple fringe along the top of the ridge on the right.  Maybe that file I sent you wasn't the original original.  I've been going around with this for so long it's possible I saved a copy with some initial adjustments made.\n \n\n\n\tI've uploaded the current version, so you can see the difference.  IMHO the halo is definitely to do with the selection brush, when one or both areas need more than a slight adjustment to the brightness and/or contrast.\n \n\n\n\tThanks for all of your help.\n \n\n\n\tIan\n \nQuiraing_adj_brush.afphoto "
<https://forum.affinity.serif.com/index.php?/topic/130322-halo-on-edge-of-selections/>