Hmm. Only supports a single image data chunk and no alpha channels in
this release. True, you could break compatibility and extend it, but I'm
not sure that's really the way to go. Not close to a drop-in replacement
yet, even after banging it on some rocks.
On 2/10/2010 3:15 AM, SuezanneC Baskerville 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
<%20http://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/
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