[Gnash-dev] comparing colors

[strk]

Ben, about pixel checking, I thnk it'd be worth
looking at FuzzyPixel and make it better :)

After all we'll likely to compare the factor of
r,g,b in a 0..1 range where 1 is 2^nbits per
channel. Alpha should be resolved prior to that.
Worth looking at some numbers to see if it'd work.

--strk; 

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