A Colour Correction Scanner.

The problem of colour correction is discussed in terms of a number of important requirements, which the design of an optimum Colour Scanner should aim to fulfill. The basic units of which any Colour Scanner is composed are stated, along with some reasons for a particular choice. The performance and operating principles of the Crosfield Colour Scanner are then described. This Scanner is an all electronic system, employing a single scanning source for both colour analysis and image resynthesis. A single cathode ray tube scans a colour transparency, and produces a set of four, colour and tone corrected, separation negatives at final printing size, i.e., by enlarging or reducing in the scanning process. The same principle is used to scan a set of three uncorrected separation negatives, and produce a set of four, tone and colour corrected separation positives.