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5 hours ago, walt.farrell said:

As I understand it, some applications guess at the original quality setting, but it is not actually recorded in the JPG file anywhere. 

I think you are right about that. Also, since JPEG uses lossy compression even at 100% "quality" there is no way to recover any data lost when the image data is compressed.

So basically, every time the file is resaved as a JPEG, there is an unavoidable loss of "quality" even if some apps guess about the original quality setting.

Edited by R C-R
Added comment about resaving

All 3 1.10.8, & all 3 V2.4.2 Mac apps; 2020 iMac 27"; 3.8GHz i7, Radeon Pro 5700, 32GB RAM; macOS 10.15.7
Affinity Photo 
1.10.8; Affinity Designer 1.108; & all 3 V2 apps for iPad; 6th Generation iPad 32 GB; Apple Pencil; iPadOS 15.7

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