intensity = (0.2989 * red) + (0.5870 * green) + (0.1140 * blue)

That's the correct answer for normal "as the eye sees it" weighting.
Go with this answer...

--
"We do not have the luxury of making that risky assumption that people
will not be affected by the potential change. I know this can be
frustrating for you as it is for us. Thanks for your understanding in
this matter.." --Some misguided soul at Microsoft

Marc C. Brooks
http://musingmarc.blogspot.com

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