Patent ID: 8974032
Filing Date: 2015-03-10
Classification: B41J,G06K,H04N

Abstract:
1. An image processing method comprising: a density unevenness measurement test image formation step of forming a density unevenness measurement test image based on image data subjected to unevenness correction processing to correct density unevenness due to a recording characteristic of multiple recording elements included in a recording head, using a preset unevenness correction value; a density measurement value acquisition step of acquiring a pre-conversion density measurement value that is a density measurement value of each density setting value for every recording element in the density unevenness measurement test image before processing after image formation using the recording head; a density measurement value conversion step of converting the acquired pre-conversion density measurement value into a post-conversion density measurement value corresponding to a density measurement value after the processing, using a density measurement value conversion value which is derived beforehand and indicates a conversion relationship of density measurement values before and after the processing for every density setting value and to which the set unevenness correction value is applied as the density setting value; and an unevenness correction value derivation step of deriving a new unevenness correction value using the post-conversion density measurement value.