When you take a photo with Goodnotes, the photo is imported directly into GoodNotes. The image data is compressed in the process.
If you want to export the photos from GoodNotes afterwards, then
you will unfortunately only receive the compressed photo data.
The original quality of the photos is unfortunately lost.
It would be good if the photos were also saved as original files in the iOS or PadOS library in addition to being imported into GoodNotes.
This would give you both the compressed photos in GoodNotes AND the original photo data.
Often you need both data!
Greetings Tobi