WebP (pronounced "weppy") is an image format for lossy compressed image files. It is developed by Google, based on technology acquired with the purchase of On2 Technologies.
As a derivative of the video format VP8, it is a sister project to the multimedia container format WebM.
Technology
WebP's compression algorithm is based on the
intra-frame coding of the
VP8 video format and the classical
Resource Interchange File Format (RIFF) as a
container format. Without further content the mandatory RIFF container leads to an
overhead of only twenty bytes and can hold additional
metadata.
Usage
The format is supposed to be a new
open standard for lossily compressed true color graphics on the web, thereby being presented as a direct competitor to the older
JPEG scheme, to which it is meant to compare favorably with the production of smaller files for comparable image quality.
Chrome will be the first browser to natively support WebP, though support is currently available in all WebM-compatible browsers via a javascript shim.
Native support has also been released for the file viewer/converter Konvertor, as well as the Pixelmator and Acorn graphics editors.
There is a free (and GPL) WebP file format plugin for Adobe Photoshop, with control over four encoding parameters.
Criticism
Jason Garrett-Glaser, a developer of the
x264 encoder, gave several points of criticism for WebP.
Using a comparison of different encodings (JPEG, x264 and WebP) of a reference image, he stated that the quality of the WebP-encoded result was the worst of the three, mostly because of blurriness on the image. His main remark was that "libvpx, a much more powerful encoder than ffmpeg's jpeg encoder, loses because it tries too hard to optimize for
PSNR" (peak signal-to-noise ratio), arguing instead that "good
psy[cho-visual] optimizations are more important than anything else for compression." He also criticized Google's announcement, saying that it shouldn't have publicized the format before its results are better than JPEG's.
See also
WebM, a multimedia container format introduced by Google earlier in 2010, on which WebP is based
JPEG 2000, an improvement intended to replace the older JPEG by the JPEG committee, introduced in 2000
JPEG XR, a computationally-lightweight alternative to JPEG 2000, introduced in 2009
References
External links
Category:Google
Category:Graphics file formats
Category:2010 introductions
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