Maybe you remember that we had an article on the very first image of the Earth taken from abroad? It was an image taken in 1966 by one of the Lunar Orbiter space probes, which had the task of taking closeup pictures of the lunar surface to find a well suited landing spot for the upcoming Apollo Moon missions. Well, you might wonder, how these photographs came back to Earth. Well, the Lunar Orbiter space probes were equipped with high resolution photographic cameras. The images were developed on 70mm film on board of the space probe, scanned into strips called framelets using something akin to an old fax machine reader and sent back via analog modulated radio transmission to Earth. What was missing was the proper equipment to print out these photographs with the proper dynamic range and the resolution that 70mm film is able to offer.
“The photos were stored with remarkably high fidelity on the tapes, but at the time had to be copied from projection screens onto paper, sometimes at sizes so large that warehouses and even old churches were rented out to hang them up. The results were pretty grainy, but clear enough to identify landing sites and potential hazards. After the low-fi printing, the tapes were shoved into boxes and forgotten.” (from Wired article)
Well, some gifted Hackers started the Lunar Orbiter Image Recovery project a while ago to recover these old photographs from tape and to make it available in the best available digital quality (as you can see for yourself in the image above). You can read the whole story in Wired “The Hackers Who Recovered NASA’s Lost Lunar Photos” and you can read more about the Lunar Orbiter Image Recovery Project at NASA.
References and Further Reading:
-  The First Image from Abroad – Earth Rising and Lunar Orbiter 1, SciHi Blog
-  Doug Bierend, The Hackers Who Recovered NASA’s Lost Lunar Photos, Wired 23.03.2018
-  Lunar Orbiter Image Recovery Project at NASA
-  The Lunar Orbiter programme at Wikidata