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?

Thought:  Perhaps a standard conversion function could be implimented in a
future version of POV and replace all those ugly and different formulas in
the code.

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