From: Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Date: 05/26/00-07:10:05 AM Z
FotoDave@aol.com wrote:
> ...
> Yes, and I was saying 80 values (or tones) ***per zone*** for highlight!!!...
I have not been able to achieve anywhere near 80 tones per Zone in the
highlights.
First, when using 256 tones, they are throughout the entire range of the
negative (more in the low negative density, less in the high negative
density). If I only produce 10 Zones in the print, that averages about
25 tones per Zone. And if the low density areas are getting more tones
per Zone, so much for the high areas (less than 10 tones). To further
frustrate, if curves are applied to give more number of tones in the
high negative density areas, then the print information is jammed into
the highlights. (Photoshop seems to spread data linearly.)
I can reduce the maximum ink density on the base negative so that the
256 tones (black ink) are distributed only from Zones I through V (about
51 tones per Zone average) (about 20 tones are generated with yellow ink
to provide a threshold and Zone 0), and add a 4 Zone mask for Zones VI
through IX (64 tones per Zone average), and another mask for X through
XII (about 85 tones per Zone average). I can likely print these on
cleared Kodalith 2556 film (not tried yet) which should be thin enough
to keep a sharp image. This is my current plan.
> ...
> You are exactly right in saying that many tones are present simultaneously.
> The situation, however, is very *similar* in music (as light and sound are
> the same thing, just different range of electromagnetic waves)....
Oh no, NOT SO, back to Physics 101.
Light is electromagnetic radiation, transverse waves (^v^v^v^v).
Sound is NOT E-M radiation, but is compression waves (|| | | |||).
And even though wave theory applies to each, they are quite different.
[Lousy art work, I know.]
However, the bit about harmonics is accurate and I also feel applies to
the appreciation of light as well as sound.
>... Music is presentation of waves in time.. ...
Music also presents in space as when several instruments are combined as
in an orchestra, producing a sound quite different from the individual
instruments.
>... Photograph is presentation of waves in 2-dimensional space ...
Photographic presentation in time is called movies (film, etc.).
-- Jeffrey D. Mathias http://home.att.net/~jeffrey.d.mathias/
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