> There is no 'correct' conversion. But YIQ model, which is probably
> most used, uses values 0.299, 0.587, 0.114, which  are pretty close to
> GREY_SCALE macro. I think that best would be to go with these values. 
> Strange value 0.229 in image.cpp is probably typo.
> For definitive information check out colorspace faq:
> http://www.faqs.org/faqs/graphics/colorspace-faq/

Interesting link. The "Colour Space Conversions" link is broken.
Going up, I found a link to http://www.inforamp.net/~poynton/ which seems 
interesting, with a gamma and a color FAQ in various formats.

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Philippe Lhoste (Paris -- France)
Professional programmer and amateur artist
http://jove.prohosting.com/~philho/

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