Quote:
Originally Posted by old_tv_nut
Have you seen any technical information on the differences in the dyes, especially actual spectral density curves? Technicolor seems never to have published any detailed info, keeping it proprietary to the end.
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Wayne,
As far as color curves, for Technicolor, I'm not aware of any being published.
Technicolor patented the earlier (late 20's early 30's) single-strip two-color version of Technicolor, and in doing so described the complete process. Kalmus always thought that he accidentally gave away the store, by making it easier for his competitors to duplicate his results and eventually improve on them.
So, later when Technicolor patented the improved three strip version, he patented the process as a whole, but intentionally left out many key details.
Today, it is easy to color correct a Technicolor print digitally, but the biggest problem today is that the
younger color correction people have never seen an original Technicolor print and usually get it way too beefy.
In pre-digital days, I occasionally had to make made photographic copies of Technicolor prints where the originals had been lost or damaged and until you actually do tests on each and every job, you can never tell how the color used in the dyes will react on color negative film. This almost always required either a negative contrast mask or a specific color flash or both to keep the color acceptable.
James.