At 05:43 PM 2/1/2016, Randy wrote:
>taking measurements of the individual RGB color channels,
>Red, Green, Blue with the Eyedropper tool
Randy, an RGB scan of a B/W print contains no useful information
relative to a grayscale scan. The color separation was not there to
begin with. The negative or print contains pure density
information.
If a scan of a B/W print results in differing R, G, and B values per
pixel, that only reflects an imbalance between the color channels of
the scanner. Scanning something like a 21-step Stouffer density
wedge would let you calibrate your scanner for grayscale scans.
It is possible to theorize about colors if the type of B/W film
(orthochromatic vs. panchromatic, etc) used for the original negative
is known, and thus their response to particular colors. I used to
belong to American Aviation Historical Society, and there were
discussions on this exact subject on interpreting colors of pre-WWII
military aircraft back in the 1980's or so.
Sorry if I'm preaching to the choir (not the first time I've done
that...)
Best regards,
Randy
--
Randy Gordon-Gilmore
http://www.prototrains.com
randy@prototrains.com
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Posted by: Randy Gordon-Gilmore <randy@prototrains.com>
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