METHOD OF CONTROLLING COLOR CORRECTION AND APPARATUS FOR IMAGEWISE EXPOSURE USING SAID METHOD

The improved method of color correction control is capable of assuring the desired amounts of color correction at all times, thereby reproducing a high-quality image of good color balance even from an original image that is so much upset in color balance as to require that color filters for three primary colors be inserted into the optical path in greatly varying amounts. Seven tables are preliminarily constructed for each of the three primary colors that represent the relationships between the amounts of insertion of color filter into the optical path and the amounts of resulting color correction, three tables for the insertion of three single color filters, three for the insertion of any two filters and one for the insertion of the three filters in combination. After the desired amounts of color correction are determined for the light carrying an original image, the initial values for the positions of the insertion of the three color filters are set and the amounts of filter insertion are divided into three cases, one being the amount of insertion of the three filters in combination, the second being the amount of insertion of any two filters and the third being the amount of insertion of a single filter. Using the associated seven tables, the amounts of color correction are determined for the respective cases and subjected to either an arithmetic addition or subtraction to provide a calculated amount of correction of each color. The amounts of filter insertion are changed until the differences from the respective desired amounts of color correction are converted to values less than a specified threshold.