Retina Revolution - smaller images with better quality

Re:Retina Revolution - smaller images with better quality by oofabz on Sunday October 07, 2012 @11:24AM (#4623491)

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.

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Re:Retina Revolution - smaller images with better quality by revertts on Sunday October 07, 2012 @11:47AM (#4623530)

Larger images saved as pjpegs tend to be slightly smaller than a standard jpeg.

http://www.yuiblog.com/blog/2008/12/05/imageopt-4/

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Re:Retina Revolution - smaller images with better quality by ars on Sunday October 07, 2012 @12:17PM (#4623591)

If you actually try it using the tool you yourself mentioned you'll see that progressive JPEG's are in fact smaller.

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Re:Retina Revolution - smaller images with better quality by FrankBooth on Sunday October 07, 2012 @04:06PM (#4624271)

Stream compression benefits from locality of data, so the ability to merely rearrange data can be quite beneficial.

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