Exposure - illuminating spectrum

From: Jeffrey D. Mathias (jeffrey.d.mathias@worldnet.att.net)
Date: Wed Dec 08 1999 - 14:57:56 /etc/localtime


Jacques Augustowski wrote:
>
> Acrylics starts transmitting at about 380 nm and goes on linearly up to 700 nm.
> ...

And this covers the visible portion of the spectrum nicely. What would
be more informative are the spectral transmission curves (% transmission
vs. wavelength) for various materials possibly used for printing frames.

Then (and I have not yet seen this), it would be informative to see the
spectral response (sensitivity vs. wavelength) of various alt-process
coatings.

But this would still not answer my interest. I am not just interested
in how fast an exposure can be made. I am interested in what result in
the print can be produced (or controlled) by a certain spectral
illumination. Is there any quantification of variations in contrast as
Sandy King mentioned for some processes? What other qualities are
influenced by a shift in spectrum?

Various light sources and window material have been discussed for quite
a while. Has anyone, or is anyone investigating what differences may
occur in the print as the exposing spectrum is altered?

-- 
Jeffrey D. Mathias
http://home.att.net/~jeffrey.d.mathias/



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