[mthwl]

These are composites, not the actual photos, if I recall correctly. The perspective is shifted and I guess the horizon is just inferred from the corners?

I haven’t found great, high-res sources, but the real photos are on the Venera Smithsonian page here: https://airandspace.si.edu/multimedia-gallery/web12184-20116...

[aimor]

I really liked this explanation of how the photos were transmit. I believe Don Mitchell was able to find the original data files for some of the transmissions and rebuild the photos in higher quality:

http://mentallandscape.com/C_CatalogVenus.htm

[nine_k]

This is incredible. Process transmissions sent 40 years ago by a foreign spacecraft, make better-than-official pictures.