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Old 14th May 2013, 11:55   #82  |  Link
dapperdan
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Join Date: Aug 2009
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Quote:
Originally Posted by mandarinka View Post
My results were much more modest (webp lossless filesizes were pretty unimpressive). Try if you don't get better compression with lossless jpeg 2000 or jpeg-XR (the former achieves better ratios). Make sure though that your software uses the reversible transform and yuv conversions. Jasper (also used in imagemagick) apparently fails to.
WebP lossless is basically a different file format from WebP. It's much more PNG-like rather than a lossless version of JPEG.

So you'd expect it to do better on typical web icon type images rather than photos (and it does: http://extrememoderate.wordpress.com/2011/11/28/a-web-centric-image-compression-benchmark/).

This is a fairly direct consequence of WebP in general being designed around making web images smaller and faster. If you've got a photorealistic image then the fastest, most efficient way to deliver it in a webpage is using lossy compression.

Last edited by dapperdan; 14th May 2013 at 11:56. Reason: link URL
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