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

Ron Festa overdrive at dceo.rutgers.edu
Fri Oct 1 10:33:48 PDT 2010


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
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>
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