Copying colour negative or diapositive picture - using individual illumination in prim. and opt. sec. colours in conjunction with analyser

摘要

In the prodn. of coloured pictures, the prim. colour densities of the negative are determined by individual illumination in the negative prim. colours by comparing the measured brightness with a standard value and equalising the different amt. of light by increasing or decreasing the strength of illumination or changing the exposure time. The novel feature is that this process is also used for the reproduction of diapositives by illuminating the diapositive in the prim. colours green, red and blue and equalising the amt. of light by changing the strength of illumination or the exposure time. Pref. the sec. colour densities are determined by individual illumination at least 3 times in narrow band filter colours, which are not the prim. colours. Colour contrast problems are avoided.