Digital BW, The Print

> There's no way that channel mixing from RGB can come
> close to that shape of response curve and selectivity.  So
> at this point I'm inclined to think that Anthony not only has a
> theoretical point but an issue that can in some cases has
> a very real effect on an image.
>
> Roy

Roy,

YOU may be very well right about what you postulate, but that isn't what
Anthony said.  He said that you can't "duplicate" Tri-X by using color
information and mapping the tonal curves.  He didn't say you can't
"duplicate" Tri-X when used with colored filters...etc.  That's possibly a
different problem.  That changes the response curve for Tri-X, which he
never said was what he was doing.

Now, on to your theory.  Why do you believe that adjusting the tonal
response with a colored filter can't be duplicated?  What is the frequency
range represented by RGB, and what frequency do you believe RGB doesn't
cover?

Austin