Method and apparatus for calibrating a colour scanner.

摘要

The spectral density and primary color density in each color-step region of a calibration chart made of a color photosensitive material is measured by a spectrodensitometer and an image reading apparatus, respectively. Then, a conversion data is obtained from the resultant data. The color density data obtained from the original made of the same color photosensitive material as that of the calibration chart are converted using the conversion data into the corresponding color dye quantity data. The spectral density characteristics of respective color dyes included in the color photosensitive material used for the original are applied to the converted color dye quantity data to obtain a composite density. Finally, the color space data of a desired colorimetric system is determined based on the composite density. <IMAGE>