[Webkit-unassigned] [Bug 218719] New: APNG can be rendered with wildly incorrect colors

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=218719

            Bug ID: 218719
           Summary: APNG can be rendered with wildly incorrect colors
           Product: WebKit
           Version: Safari 14
          Hardware: All
                OS: macOS 10.15
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Images
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jonathan at tumult.com

Created attachment 413612

  --> https://bugs.webkit.org/attachment.cgi?id=413612&action=review

problem image and source pngs

The attached "animated.png" does not render properly in Safari 14 or STP 115.  The coloring on some frames can be extremely incorrect.

- This does not happen when using Quick Look in the Finder
- This does not happen in Chrome

The PNG was generated with apngasm via:

```
apngasm -o animated.png -d 33 -l 1 --force sources/*.png
```

This affects content created by Tumult Hype: https://tumult.com/hype/

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