- Letting it warm for a while
- Putting windows in the right places, because each one generates its own artifacts
- Setting background to dark with the white pattern
- Fiddling with the contrast knob and matching it with the right viewing angle
- Using 2x zoom
To be fair, the default photo app of iPhone 16 automatically reduced some of the artifacts. The only post-processing done myself in GIMP was very basic stuff like adjusting white balance, exposure and contrast.
Here you can see a few very quick-n-dirty photos I just took for comparison - https://imgur.com/a/6Xz6vc8
Btw. the QEMU screenshots are still in the repo in https://github.com/luke8086/gentleos32/tree/main/doc/appimg