A strip of exposed and developed color film is transported through a transparency measuring system. The transparency of each frame of the film strip in the three primary colors is measured at a multiplicity of regions. The transparency values are converted to density values which are processed to generate...http://www.google.fr/patents/US4589766?utm_source=gb-gplus-shareBrevet US4589766 - Copying method and arrangement for colored originals
Copying method and arrangement for colored originals
