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I am not completely sure without checking the specification but still pretty confident that progressive JPEGs are not made up of several images at different res
by danbruc 12y ago
I am not completely sure without checking the specification but still pretty confident that progressive JPEGs are not made up of several images at different resolution but just have the low frequency component first. And images with text are neither the common use case for images nor the intended use case for progressive JPEGs.
- thaumasiotes 12y agoThe user experience is not determined by how the technology secretly works. Appearing to do something wrong is a bad thing in and of itself.
- danbruc 12y agoI don't get it. Progressive JPEGs have no redundant information - I verified that - and are usually a bit smaller than sequential ones because of a more favorable arrangement of different components for entropy coding. And producing initially blurry images of text is not the fault of progressive JPEGs but at most a bad technology choice for a given use case. The image will get fully loaded in the same time no matter if it is sequentially or progressively encode so at best a sequential JPEG containing text can claim that the first lines get readable earlier.