A Method for Determination of Color Correction in Color Printing

Abstract

Generally, the level of exposure and color correction in color printing device is determined based on the evaluation about the tricolor full frame transmittance of color negative. In such evaluation the transmittance is measured as an arithmetic average which is depend on the low density area of color negative and is not correspond to the reasonable density level of color positive. Highlight and midtone densities of color print will be attract attention for observer in visual evaluation, therefor the correct information for color printing should be obtained from reasonable color negative density measurement which is corresponding to such positive densities.
To obtaine the correct information for determining the color correction based on the reasonable density level of color negative, it is necessary to express the correction factor in terms of coefficient of the exponent and apply it to the transmittance values measured from color negative which is divided into appropriate numbers in area.
In the present paper, authors try to bring forward a method to give the correct information of the exposure and of the color correction in color negative-positive printing device based on the above point of view.