[Webkit-unassigned] [Bug 21458] New: Improve image comparison algorithm in ImageDiff

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Oct 7 19:19:48 PDT 2008


           Summary: Improve image comparison algorithm in ImageDiff
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh
        OS/Version: Mac OS X 10.5
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Tools / Tests
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: pol at apple.com
                CC: simon.fraser at apple.com

We would like to improve the image comparison algorithm in ImageDiff:
- provide a new comparison algorithm that is more tolerant to "acceptable"
failures (i.e. very small differences in font rendering, which --threshold is
not really good at handling)
- generate normalized intensity only diff images
- have this new behavior be opt-in through a new option for backward

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