Photographs displayed in frames do not use mipmaps, causing severe artifacts when viewed from a distance. This is true for vanilla minecraft maps as well; however, the dithering used in Exposure's photographs exacerbates the issue considerably, causing photographs to shimmer excessively even when viewed from relatively close distances.

This mod seems to resolve the issue for vanilla maps; perhaps a similar solution could be used here?

(Using exposure-1.20.1-1.7.7-fabric.jar)

I was trying to fix this one day, but to no avail.
Thanks for pointing out this mod, it's exactly what I was trying to find.
My only hope is that it'll work, because I have read somewhere that mipmapping cannot be enabled for non power of 2 texture sizes, and exposure uses non-standard texture size of 320x320.

Yep, it works! This is huge, it looks so much better now, thank you so much for sending me mapmipmapmod repo. And thanks to Jalvaviel for implementation example.
This will be part of a 1.21 port, but I'll try to backport it to prior versions as well.

Added in 1.21.1 - 1.8 and 1.20.1-1.7.8.