| 摘要 |
A defective recording element correction parameter selection chart (5) which is output by an image forming apparatus (100) that performs image formation on a recording medium (124) by a plurality of recording elements (253) included in a recording head (172M, 172K, 172C, 172Y, 250) while conveying at least one of the recording head (172M, 172K, 172C, 172Y, 250) and the recording medium (124) so as to cause relative movement between the recording head (172M, 172K, 172C, 172Y, 250) and the recording medium (124), the chart (5) being used, in a case where there is at least one defective recording element (NA_j, NB_k, N z _A, N z_ B, N z_ a, N z _b, N z _c, N z _d) which is not able to perform recording among the plurality of recording elements (253), in order to determine a defective recording element correction parameter (P i ) expressing an amount of correction for correcting image formation defects caused by the at least one defective recording element (NA _ j, NB_k, N z _A, N z_ B), with image formation by a recording element (253) other than the at least one defective recording element (NA _ j, NB _ k, NZ_A, NZ_B, NZ _ a, NZ _ b, NZ_c, NZ_d), includes: a reference patch (I ref ) constituted by a uniform image which is an image formed on a region of the recording medium (124) with a uniform density based on a constant tone; and at least one measurement patch (I i meas (P i )) in which a state after correction using the amount of correction corresponding to a candidate value of the defective recording element correction parameter (P i ) which expresses the amount of correction is reproduced in a state that one or more of the recording elements (253) which have formed the reference patch (I ref ) are set to be in a non-recording state, the candidate value of the defective recording element correction parameter (Pi) being applied to an image formation portion which is formed by a recording element that carries out recording in a vicinity of a non-recording position of the one or more of the recording elements (253) which have formed the reference patch (I ref ) and have been set to be in the non-recording state. |
