Digital BW, The Print

Truman,

> When you shoot in color you have three amplitude
> responses to contend with - one for each filter measures the amplitude
> at each frequency. It's the area in the fall off of these filters where
> the problem arises.

Specifically, what problem?  Yes, the quantum efficiency of the CCD is less
in this range, but the information is still "seen".

> While you would have to know quite a few specifics about the color
> filters used to answer such a question, in general the calibration to
> ture a color negative into a "TriX" image would be quite an undertaking.

And I disagree, but you can prove me wrong by agreeing to pay me to
undertake the algorithm, and if I can't do it, you don't one me a thing ;-)

> The issues of dynamic range also comes to play in the shadow and
> highlight areas. As long as you are in the linear range of the sensor (
> or film ) you can do all the manipulation you want. When you get into
> the nonlinear range, e.g., the shoulder and toe, all bets are off and
> calibration of color to black and white that maintains the fidelidity
> you get from a black and white sensor is most likely not possible.

And again, I disagree.  As long as it's deterministic, it can be reproduced.
What you (or Anthony) will end up fussing about is the accuracy (having to
do with the dynamic range as you point out, and having to do with fidelity)
of the reproduction...but I'm not convinced that this is really an issue,
but it is something to look for, no doubt.  But, I still believe that within
the VISIBLE grayscale space (let's even say 8 bit space, which is larger
than our vision can discern in grayscale anyway), this is simply not an
issue and can be done.

Austin