Patent ID: 8498020

Claim:
An image processing apparatus comprising: a color information acquirer configured to acquire color information of a scanning line of a head in a main scanning direction; and a corrector configured to correct a parameter used for a halftone process of a scanning line in the main scanning direction and a parameter used for a halftone process of an adjacent line adjacent to the scanning line for error diffusion, and, based on the acquired color information and the corrected parameters, is configured to correct a color difference of the scanning line and the adjacent line, wherein: the parameter for the halftone process of the scanning line corresponds to one or more quantized reference values for a first head portion having a property of a first value, the parameter for the halftone process of the adjacent line corresponds to one or more quantized reference values for a second head portion having the property of a second value less than the first value, and the one or more quantized reference values for the first head portion are greater than the one or more quantization reference values for the second head portion.