I meant the green and purple fringes around high-contrast edges (branches of trees with bright sky behind, etc.). This is the thing I managed to make work in Affinity Photo, but was disappointed to find the result no better than I can do 'manually' in PE 7 (usually in conjunction with the selection tool so that the process is only done in areas of the image where needed). At least it shows that my guess about how 'automated' correction works has been proved correct - it desaturates the fringes to a light-grey or mid-grey with a soft edge, which is what I've been doing manually with the 'replace colour' facility in PE 7. Since I only use this a few times a year when preparing images for printing, it's not a problem. It would be if I was doing a lot... I understand the 'nerd' reference: this is a problem I have encountered on other software I've had 'on trial' over the last 10 years, and it's getting worse. Perhaps nerds don't use reference manuals and love online 'tutorials'. There are many facilities in my 10 year old copy of PE 7 that I have looked at once and never used, so perhaps Affinity Photo would have a greater proportion of these, but the facilities I actually use may be no better than PE 7.