"Edward C." wrote:
> 
> Looking through the source for a formula to convert RGB values to grey
> values, I've discovered a number of slightly different formulas, none of
> which will convert RGB <1,1,1> to a grey value of 1.  Perhaps there is some
> good reason for this, perhaps not, but either way, does someone have a
> formula that will convert in this manner?

There are two that I have seen in POV:
  0.2125*R + 0.7154*G + 0.0721*B (as mentioned by Nieminen)
and
  (R+G+B)/3.0

I agree that it should be standardized (with a macro or inline function)
in the future.

-Nathan

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