I was wondering whether anyone knows of, or can recommend, an extension for Photos on macOS that allows correcting perspective?
The app “Perspective Photos Extension” would seem to be the answer to my question. But neither its screenshots nor its reviews convinced me it would be worth the purchase. I haven’t come across any similar app that provides a Photos extension. Instead, I decided to try “DxO Perspective” in combination with “External Editors For Photos”.
I find Readdle's Scanner Pro (for iOS) does a great job of auto-detecting document edges and applying perspective correction of pages with its (automatic) Distortion Correction feature. It can interoperate with existing images stored in the Photos app from the Mac.