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Ah, my bad. I thought that was the source, but seems like the DB I found the high quality versions was elsewhere. Search for the "PIA number" of the images to find the high-res versions, example:

I was also confused about this when trying to download some artemis photos to use as wallpapers. The galleries default to the "large" size, but if you copy the PIA number of an image and search at https://images.nasa.gov/ you can get the much higher resolution "original" quality.

Missing context :P These are images from 60-ish years ago, so about HD quality is definitely high quality for the time.

the film they were using for these pictures allows for way higher resolution scans than 1080p