[Webkit-unassigned] [Bug 191868] New: Colours are slightly shifted when using Canvas.captureStream()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=191868

            Bug ID: 191868
           Summary: Colours are slightly shifted when using
                    Canvas.captureStream()
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.13
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: adam at tokbox.com
                CC: youennf at gmail.com

Created attachment 355368

  --> https://bugs.webkit.org/attachment.cgi?id=355368&action=review

Canvas and Video element with 2 slightly different colours

If you draw on a canvas and use canvas.captureStream the resulting colours in the video are slightly different than the colours on the Canvas. This is also the case a bit in Chrome and Firefox but in Safari it is quite a bit different.

See https://output.jsbin.com/rebesum where a new random colour is drawn every 1 second on both a Canvas and a Video. It's more noticeable with some colours than others.

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