Process for the preparation of photographic color copies

Details Process for the preparation of photographic color copies Process for the preparation of photographic color copies

H - Electricity

04

N

H04N 1/46 (2006.01) G03B 27/73 (2006.01) H04N 1/32 (2006.01) H04N 1/41 (2006.01)

Patent

CA 2050807

In a photographic copy process the copy master is scanned in intervals, by a source of measuring light. The measuring light is spectrally split, detected and converted into electrical measuring signals. The n spectral measuring signals are converted into n spectral density values, compared with neutral densities and n spectral density differences formed. In a data compression the n spectral density differences are converted by an orthogonal transformation to m < n transformation coefficients. The transformation coefficients are analyzed in a color and density correction routine and deviations computed. From the deviations the copy light quantities and exposure corrections adjusted to the copy material are determined. The photographic copies are produced by the exposure values determined.

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