Process and apparatus for exposing photographic material when making colour reproductions

Abstract

Abstract The device is provided with automatic exposure means (30), of a conventional construction, having colour correction filters (12, 12') arranged in a lighting block (11), and colour television means (32) for the visual appreciation of each copy of a photographic colour reproduction expected after exposure and development. For producing on the screen (37) the colour television image, a computer calculates from measured colour density values, control values for the television means (32) owing to which the television image becomes a reproduction of the copy which will be obtained on the printing material (20). When the television image is considered as being good, the exposure is done with the exposure values or the calculated copy. A defective television image is corrected, as to the brilliance and/or the colour balance, by means of calibrated adjusting elements (54), and the computer (27) calculates, on the basis of the corrections entered, the exposure values for the corrected copy with which the printing material (20) is exposed. Consequently, correction must be done only with photographic colour reproduction which would give an unsatisfactory copy. A high efficiency is obtained and copies to be discarded are, to a great extent, inexistant.

Inventors

• 👤 Walter Dr. Grossmann

Bibliographic Details