[Webkit-unassigned] [Bug 118576] New: Weird color differences on Acid3 test

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=118576

           Summary: Weird color differences on Acid3 test
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.8
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Images
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: igeek1 at gmail.com


Created an attachment (id=206488)
 --> (https://bugs.webkit.org/attachment.cgi?id=206488&action=review)
screen recording of the bug

Steps to Reproduce:
1. Go to http://acid3.acidtests.org in Safari or Webkit Nightly. I was able to reproduce this in 6.0.5 (8536.30.1) and 6.0.5 (8536.30.1, 538+).
2. Command-click the Reference Rendering link to open it in a new tab.
3. Switch back and forth between the two tabs.

Expected Results:
The colors in the six colorful squares are identical between the real test and the reference rendering.

Actual Results:
The colors are different. To my eyes, the blue square is the most obviously a different color, but sampling the attached video with e.g. DigitalColor Meter.app on a Mac will reveal that they are all different colors.

Here's where it gets weird: if I refresh the reference rendering page, as shown in the attached video, the colors then match up perfectly between the reference rendering and the actual test.

Regression:
I believe this started within the last several months, certainly less than a year. I noticed it a while ago, but it didn't occur to me to report it until just now.

Notes:
This problem does not seem to exist in Firefox. The current stable build of Chrome fails miserably at the Acid3 test (no colored squares show up), so I was unable to determine whether it happens there. As far as I can tell from screenshots, the problem is not present in Mobile Safari on an iPad mini running iOS 6.1.3.

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