Make selenium pass in 1.0 for alphaThreshold
Make selenium pass in 1.0 for alphaThreshold

It seems like short of writing a new diff program
the original idea of multiplying the alpha in
as RGB * (0.5 + alpha * 0.5) would give a better
test.


git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@24012 0039d316-1c4b-4281-b951-d872f2087c98

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