Patent ID: 8625162

Claim:
An image processing apparatus having a function of carrying out a plurality of halftone processes, the image processing apparatus comprising: a density correction process section for carrying out a density correction process with respect to the plurality of halftone processes; and a density correction adjustment section for adjusting the density correction process carried out by the density correction process section, the density correction process section finding an output correction value of a reference halftone process of the plurality of halftone processes by use of a result of measurement of densities of respective patches of a patch pattern subjected to the reference halftone process, and finding an output correction value of at least one of the plurality of halftone processes which is other than the reference halftone process by conversion from the output correction value of the reference halftone process by use of a conversion parameter set for the at least one halftone process, the density correction adjustment section receiving an instruction to adjust the density correction process carried out by the density correction process section and reviewing the conversion parameter used by the density correction process section, so as to adjust the density correction process, wherein the density correction adjustment section includes: a first output correction value actual measurement section for, in response to an instruction to adjust the reference halftone process of the plurality of halftone processes, finding an output correction value of the reference halftone process by use of the result of the measurement of the densities of the respective patches of the patch pattern subjected to the reference halftone process; a first conversion parameter calculation section for finding new conversion parameters for all the halftone processes having conversion parameters in accordance with (i) the output correction value of the reference halftone process found by the first output correction value actual measurement section, (ii) the output correction value of the reference halftone process already found by the density correction process section, and (iii) predetermined conversion parameters so that an output correction value found by conversion from the output correction value of the reference halftone process found by the first output correction value actual measurement section is identical to an output correction value found by conversion from the output correction value of the reference halftone process already found by the density correction process section; and a first conversion parameter update section for updating the conversion parameters of all the halftone processes to the new conversion parameters calculated by the first conversion parameter calculation section.