| 摘要 |
These methods for correcting density characteristic and color store previously a reference measured value obtained by measuring a reference original with a reference measuring instrument, read the same reference original with an image reading apparatus which is a target to be corrected, compare an statistic obtained by analyzing the thus read value with the stored reference measured value and calculate at least one of an input density characteristic correction parameter and an input color correction parameter, based on the obtained result. As a result, these methods can suitably correct the unevenness of the various characteristics, the unevenness of the spectral sensitivity or both of the image reading apparatus (scanner) caused by light sources, optical filters, image sensors or the like and perform the correction of the density characteristic which is a basis of an appropriate color reproduction in accordance with the original image, the color correction for obtaining a constant color reproduction or both. |
