Link: Unraveling the JPEG

Unraveling the JPEG by Omar Shehata.

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!

Detailed, readable explanations with live byte editors that show you what happens to the image when you edit it. Very cool!