I am pretty that has already been posted somewhere, but I have some issues with the reverse engineering of a pcb. Files are attached (and colors inverted, but still it doesnt work).
So I have seen this featue here: https://www.youtube.com/watch?v=EUdbxKgsFl8&t=186s&pp=ygUXcGNiIHJldmVyc2UgZW5naW5lZXJpbmc%3D
but could not follow up, since the image is distorted (and much to big):
My first guess is that your original pictures are corrupted or in a format incompatible with KiCad. As dsa-t has shown, the jpegs you made can be imported into KiCad, but they are only a part of the design. My first attempt would be to try to convert your pictures to another format, or even just save it with another program.
There are no “absolute sizes” in nearly any pixel based picture format. However, the video you linked to starts explaining the scaling exactly at the point that you linked to (@ 3 minutes into the video).
I was a bit busy with other things so far, but I’ve tried different photo-format (png),
different color inversions, and also different install sources (flatpack, snap) and also checked settings but did not found a fallback graphic. So I am pretty sure its a driver and / or wayland problem…