Chromium Blog
News and developments from the open source browser project
Lossless and Transparency Modes in WebP
2012年8月30日木曜日
Cross-posted on the
Google Developers Blog
At Google, we are constantly looking at ways to make web pages load faster. One way to do this is by making web images smaller. This is especially important for mobile devices where smaller images save both bandwidth and battery life. Earlier this month, we released
version 0.2 of the WebP library
that adds support for lossless and transparency modes to compress images. This version provides CPU and memory performance comparable to or better than PNG, yet results in
26% smaller files
.
WebP’s improved compression comes from advanced techniques such as dedicated
entropy codes
for different color channels, exploiting 2D locality of
backward reference distances
and a color cache of recently used colors. This complements basic techniques such as
dictionary coding
,
Huffman coding
and
color indexing transform
. We think that we've only scratched the surface in improving compression. Our newly added support for
alpha transparency
with lossy images promises additional gains in this space, helping make WebP an efficient replacement for PNG.
The new WebP modes are supported natively in the latest Beta version of Chrome. The
bit stream specification
for these new WebP modes has been finalized and the
container specification
has been updated. We thank the community for their valuable feedback and for helping us evolve WebP as a new image compression format for the web. We encourage you to try these new compression methods on your favorite set of images, check out the code, and continue to provide
feedback
.
Posted by Jyrki Alakuijala - Software Engineer
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