Digital BW, The Print

Austin writes:

> The other option is that I'm correct, and you are
> wrong.  Strongly consider that.

Why?  You've provided even less support for your position than I have.

> I suggest you do a web search.

No, I want to see you provide an example.  You say you see it all the time,
it should be trivial.  How about a program or something that does it?  Plug
in three RGB values, and out comes the grayscale value.  It must work for
any type of light in the original scene.  It must duplicate the grayscale
image obtained by photographing the scene directly with Tri-X.