JPG settings in Gimp

[Ofnuts]

(01-14-2018, 06:05 PM)quand Wrote: I opened a picture with Gimp and it says that jpg quality is 90......

Where does Gimp says so? In the JPEG save options?

(01-14-2018, 06:05 PM)quand Wrote: If i set "Use original quality", Gimp says that this original jpg quality is 80.....
What happened exactly when the photographer changed it to 90......

is quality 80 is the one from the camera ?

"Original quality" for Gimp is the quality of the image it loaded, which can be different from the one out of the camera if this isn't the original picture?