Digital BW, The Print

> No offense Austin, but you really snipped out all my relevant points and
> didn't answer much concretely.

Sorry, I answered what I thought was important, and, what I believe, was
quite clearly!

> My main point was that for a formula that you suggests indicates
> the number
> of tones present in a print, based on sampling as few as three tones,

No, my formula does not suggest that at all.  It does suggest measuring TWO,
dMax and dMin, but noise/smallest discernable signal may take many tones to
measure.

> You also did not speak to my premise that I think that a calculation of
> tones from DyR is only possible if linearity is assumed, which is not
> something I would take for granted in a silver print.

You don't need linearity at all.  Noise can be calculated using calculus,
and integrated over the entire range of the print...  Knowing math is not
your strong point?  I am guessing you don't know what integration is, in a
mathematical sense?  I can explain if you like.

Regards,

Austin