Also forgot to add this link as its a good write up and comparison of x264 vs vp8 vs JPEG w/jpgcrunch for still images: http://x264dev.multimedia.cx/?p=541
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 1:33 PM, Ron Festa <overdr...@dceo.rutgers.edu>wrote: > 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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