Patent ID: 11936835
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  B | IPC B  H

Claim 17:
18. An image processing apparatus for a printing apparatus,
wherein the printing apparatus includes
a plurality of nozzle arrays including a plurality of nozzles arranged in a predetermined direction, each array corresponding to an ink of a plurality of inks, and
prints an image on a recording medium by discharging the plurality of inks from the plurality of nozzles included in the corresponding nozzle array according to a combination of output color signals determined by the image processing apparatus,
the image processing apparatus comprising:
a processor; and
a memory coupled to the processor storing instructions that, when executed by the processor, cause the processor to
convert input color signals, for printing a first image in a first area of the recording material, into output color signals, for controlling a discharge of ink from the respective nozzles corresponding to the first area,
convert input color signals, for printing a second image in a second area of the recording material, into output color signals, for controlling a discharge of ink from the respective nozzles corresponding to the second area,
correct, using Multi-Color Shading (MCS) processing and Head-Shading (HS) processing, the output color signals for predetermined variations in the discharge of the nozzles used in the printing of the first image and the second image, and
in a case of one ink of the plurality of inks being an achromatic ink, constrain the correction by the MCS processing of the output color signals for the one ink.