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libraries/libwebp: Update README.

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Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>
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powtrix 2015-01-03 08:13:41 +07:00 committed by Willy Sudiarto Raharjo
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libraries/libwebp/README
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@ -3,3 +3,16 @@ images. The degree of compression is adjustable so a user can choose
the trade-off between file size and image quality.
WebP typically achieves an average of 39% more compression than JPEG
and JPEG 2000, without loss of image quality.
WebP is a new image format that provides lossless and lossy compression for
images on the web. WebP lossless images are 26% smaller in size compared to
PNGs. WebP lossy images are 25-34% smaller in size compared to JPEG images at
equivalent SSIM index.
WebP supports lossless transparency (also known as alpha channel) with just 22%
additional bytes. Transparency is also supported with lossy compression and
typically provides 3x smaller file sizes compared to PNG when lossy compression
is acceptable for the red/green/blue color channels.
Webmasters and web developers can use the WebP image format to create smaller
and richer images that can help make the web faster.