This is a reprocessed image of Jupiter’s Great Red Spot from the 1979 Voyager 1 encounter with the planet. Old data like this is being crunched by people like Bjorn Jonsson to create new and better detailed images that were not possible when the data sets were originally acquired. For comparison, just take a look at the “official” NASA release of the same image data from back in '79. I do need to begrudgingly note that the contrast and sharpness have been artificially exaggerated in this newer image for appearance.