libwebp (WebP photo compression library)
WebP is a method of lossy compression that can be used on
photographic 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.
https://developers.google.com/speed/webp/
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