[opensource-dev] WebP, a new image format for the Web

Ron Festa overdrive at dceo.rutgers.edu
Fri Oct 1 10:35:49 PDT 2010


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 <overdrive at 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 <suezanne at 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 --
>>
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