[Webkit-unassigned] [Bug 244528] New: [GTK][WPE] Decoding artifacts in JPEG2000 images

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=244528

            Bug ID: 244528
           Summary: [GTK][WPE] Decoding artifacts in JPEG2000 images
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aperez at igalia.com
                CC: sabouhallawa at apple.com

Created attachment 462000

  --> https://bugs.webkit.org/attachment.cgi?id=462000&action=review

Screenshot showing the same JPEG2000 file loaded in Epiphany/WebKitGTK, and GIMP

This can be seen browsing the Epson website, e.g. https://www.epson.co.uk
and in particular the big carousel images, like this one: 

  https://i8.amplience.net/i/epsonemear/home_0722_cashback-slide_uk?$ct2-xl-img1$&$poi$&fmt=jp2

(The website uses “fmt=auto” in the URL, which makes the server use JPEG2000
when loading the URL with WebKitGTK/WPE based browsers; but I have replaced the
link here to have “fmt=jp2” to force the download of the JP2 file when opened
in browsers that do not support the format.)

I am attaching a screenshot of Epiphany (WebKitGTK) and GIMP displaying the
aforementioned file, where the artifacts can be seen, for those who cannot
load JP2 files in their browsers.

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