[Webkit-unassigned] [Bug 50117] New: pixel interpolation error

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=50117

           Summary: pixel interpolation error
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: SVG
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: j.chetwynd at btinternet.com
                CC: zimmermann at kde.org, mdelaney at apple.com


somewhere the rendering of pixel level graphics is broken,

banding is readily evident in the attached images
and is limited to Safari-webkit and Chromium, 
not able to be reproduced using Opera nor Mozilla

I have attached a testcase that uses lerp to interpolate colour values,
and produce gradients across 2 dimensions, rather than a simple linear gradient.

I have not been able to identify precise reasons,
however in a broad range of situations,
using a variety of methods,
banding is always present.

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