6 ms·
Progressive JPEGs are not smaller. They contain the same data, just rearranged. You can losslessly transform a progressive JPEG into a baseline JPEG and vice ve
by oofabz 14y ago
Progressive JPEGs are not smaller. They contain the same data, just rearranged. You can losslessly transform a progressive JPEG into a baseline JPEG and vice versa, without recompressing it. The jpegtran tool, included with the standard JPEG library, can do this.
- revertts 14y agoLarger images saved as pjpegs tend to be slightly smaller than a standard jpeg. http://www.yuiblog.com/blog/2008/12/05/imageopt-4/ http://www.yuiblog.com/blog/2008/12/05/imageopt-4/
- ars 14y agoIf you actually try it using the tool you yourself mentioned you'll see that progressive JPEG's are in fact smaller.
- FrankBooth 14y agoStream compression benefits from locality of data, so the ability to merely rearrange data can be quite beneficial.