Digital BW, The Print

Austin writes:

> Being that I've been in the digital imaging
> business for over 25 years, any discussion on
> digital imaging is very important to me.

That's why it mystifies me that you don't seem to understant this.  It
_must_ have come up many times in the past, I should think.

> Yes, and that's why it's done all the time,
> whether you concur or not.

Show me an example.  Show me an algorithm or table or anything that will
transform an RGB image from Provia, or from a digital camera, into a B&W
image that exactly duplicates Tri-X, for example.  I want to see the
miracle.

> Everything is an approximation.

No.  Some transformations are exact.  For example, an inversion of an image
to its negative form is lossless and exact; every positive image has one and
only one negative image, and vice versa.