From: Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Date: 02/04/01-06:36:51 AM Z
Mark Nelson wrote:
> How would you propose to do your output for the negative? Piezography on
> film? ... Or, are
> you still considering multiple negatives?
Whatever works. Piezography seems to have the best chance at this
point. Multiple negatives may still be a consideration. I have not
found any information on the dynamic range (white to black) of
Piezography. (Not conjecture, but actual tested information.)
> I'm wondering if you worked with color and were able to determine different
> colors that would hold back the spectrum of light for Pt/Pd in varying
> degrees ...
Been waiting for someone else to look into that. Although keep in mind
that various inks may have various transmission characteristics. For
what I am doing now, it is best to just choose inks and printer that
deliver the density range and discrimination required.
> ... This might give you a lot more steps.... 256 x
> 256 x 256, or even if only two colors could be used, then you would have 256
> x 256 levels.
Doesn't seem to work that way. You pointed out earlier that the printer
is going to put everything back to 8-bit anyway. The two options I can
come up with are:
A) the Piezography system (inks and software);
B) multiple passes through the printer.
The duotone, tritone, etc. seems to be useless and un-true without
multiple passes through the printer(s). Registration and scratching
seem to be problems for an inkjet.
> I am trying to remember how many levels in a gradient the human eye can
> detect.... ...
It may also depend of the materials and process, and a reason for doing
the study.
-- Jeffrey D. Mathias http://home.att.net/~jeffrey.d.mathias/
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