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WebKitGTK 2.23.90 Adds Support For JPEG2000, More Touchpad Gestures

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  • #11
    Originally posted by Blahblah View Post
    Not quite; JPEG 2000 supports region-of-interest coding, where less quantization is applied to portions of the image that are visually important (as determined by the encoder). I.e. only portions of the image that would otherwise become blocky in original JPEG end up blurred in JPEG 2000, not the whole image.
    While it may be true that a JPEG 2000 encoder can target that filter only to smooth gradients and other places where it is most desirable, common JPEG 2000 encoders appear to choose to spread error over a whole block (better for PSNR to be sure!) instead of preserving detail at the expense of some harshness. <http://xooyoozoo.github.io/yolo-octo-bugfixes/#moscow&jpg=s&jp2=s>

    WebP with libvpx does similar things, often blowing details away entirely rather than allowing them to produce artifacts; JPEG XR encoders currently seem to do much the same, but in some cases they'll preserve more detail than JPEG, it is a bit of a wash. When it comes to color accuracy, JPEG 2000 usually wins though, JPEG XR encoders typically do as bad or worse a job as JPEG encoders when it comes to preserving colors.
    Last edited by microcode; 17 February 2019, 06:59 PM.

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