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Something not mentioned in great detail is the way these compression algorithms work. JPEG is targeted directly at photographs where slight changes in pixel color are not noticed. PNG is targeted more for fabricated images that contain large areas of a single color where is compression is taken full advantage of like in your example of a huge all white photo ...


10

JPEG has backing from the photographic industry and predates PNG by a half-dozen years or so, while PNG was designed as a replacement for GIF, which was rather zealously protected by CompuServe. People were sued for using GIFs on their websites, for example, simply because they didn't use a program that was licensed by CompuServe to make those images. From ...


31

Because they are way better at compressing pictures that have lots of colours and irregular shapes, like photographs. Have you tried the same epxeriment you did, but then with a photograph? The .png is most probably going to be noticeably bigger than any .jpg, regardless of the .jpg's compression factor. Example: .png picture, 110k. .jpg at 100% ...



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