“Unraveling the JPEG: JPEG Images Are Everywhere in Our Digital Lives, but behind the Veil of Familiarity Lie Algorithms That Remove Details That Are Imperceptible to the Human Eye. This Produces the Highest Visual Quality With the Smallest File Size—But What Does That Look Like? Let’s See What Our Eyes Can’t See!”, 2019-05-01 (; similar):
[‘Explorable’ web page on the venerable JPEG format. Shehata provides an interactive interface to raw JPEG files: one can edit the raw hex files of a JPEG to instantly see the effects of the corruption on the displayed image.
By editing rows, one understands the redundancy of the pixels in an image, and how the JPEG format exploits this by building up images out of a series of repeating blocks, then achieving its size reductions by throwing away the least important blocks.]