Digital BW, The Print

Peter writes:

> But that's just as artificial as the single-wavelength
> LED example I used.

It is a simplified illustration.

> You have not demonstrated this has any bearing
> on the real world problem of mapping color film
> to black and white.

I've tried to explain this in as many ways as I can.  Since I'm not making
any progress, I'll stop here.  Believe whatever you wish to believe; it will
affect your results, not mine.