Quote:
Originally Posted by mandarinka
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.
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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.