Intriguingly, if you convert both of your examples to greyscale in Photoshop (I used CS3) by desaturating, the averaging example gives a more accurate gradation of grey values.
Desaturation doesn't even pretend to try and preserve luma -- http://www.inkjetart.com/tips/grayscale/ so while it appears more accurate, it's because it's not handling brightness the way it should.
-- [ christopher wright ] [EMAIL PROTECTED] http://kineme.net/
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