VP8 focuses too much on PSNR which for still photo usage comes out blurrier. Plus Google's ref-spec VP8 is not exactly known for being CPU friendly on encode or decode. Even then they're comparing to standard JPEG, not JPEG2000 which there has yet to be a comparison test of. Even then its an unproven format that so far only shows its better at compression then standard JPEG even when jpgcrunch is used. IMO, its not worth using until the issues are resolved and even then its still got a long way to go for adoption.
Ron Festa Virtual Worlds Admin Division of Continuing Studies at Rutgers University PGP key: http://bit.ly/b1ZyhY Phone: 732-474-8583 On Fri, Oct 1, 2010 at 1:15 PM, SuezanneC Baskerville <sueza...@gmail.com>wrote: > Google is putting out a new open source image format, said to offer higher > compression rates than JPEG2000. > > I just thought someone with the appropriate technical knowledge ought to > take a look at in case it might be useful for use in Second Life. > > http://blog.chromium.org/2010/09/webp-new-image-format-for-web.html > > *To improve on the compression that JPEG provides, we used an image >> compressor based on the VP8 codec that Google >> open-sourced<http://blog.webmproject.org/2010/05/introducing-webm-open-web-media-project.html>in >> May 2010. We applied the techniques from VP8 video intra frame coding to >> push the envelope in still image coding. We also adapted a very lightweight >> container based on >> RIFF<http://en.wikipedia.org/wiki/Resource_Interchange_File_Format>. >> While this container format contributes a minimal overhead of only 20 bytes >> per image, it is extensible to allow authors to save meta-data they would >> like to store. >> >> While the benefits of a VP8 based image format were clear in theory, we >> needed to test them in the real world. In order to gauge the effectiveness >> of our efforts, we randomly picked about 1,000,000 images from the web >> (mostly JPEGs and some PNGs and GIFs) and re-encoded them to WebP without >> perceptibly compromising visual quality. This resulted in an average 39% >> reduction in file size. We expect that developers will achieve in practice >> even better file size reduction with WebP when starting from an uncompressed >> image. >> * > > > http://code.google.com/speed/webp/ > -- > v i r t u a l w o r l d e n t h u s i a s t > -- http://www.google.com/profiles/s u e z a n n e -- > > _______________________________________________ > Policies and (un)subscribe information available here: > http://wiki.secondlife.com/wiki/OpenSource-Dev > Please read the policies before posting to keep unmoderated posting > privileges >
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