I get what you are saying, but this is not an issue in this case. Most screenshots were done with analog film cameras pointing at a CRT. So resolution is not a limiting factor. See: http://www.usgamer.net/articles/back-when-screenshots-really...
"That machine that we had at Work House in Tokyo looked like a VCR or something. It was huge. They'd hook it up to the game system, and then it would print out a picture that was maybe four postage stamps big. It wasn't even as large as a Polaroid. It would print out this beautiful color picture, and then these guys would sit there and take their X-Acto knives and cut out the trim, and then they'd paste them onto this larger board, and make this huge board that was the entire map."
http://www.gamasutra.com/view/feature/183233/nintendo_power_...