Image processor and image processing method for reducing consumption amount of recording material

An image processing method for outputting image data to an image forming device forming an image on a recording medium with use of a recording material having a plurality of color components, the image processing method comprising the steps of:

• determining a region having higher brightness than predetermined brightness and a region having a lower brightness than the predetermined brightness in the image data on the basis of the image data;
• and
• reducing density values of color components other than a color component having a maximum density value among the plurality of color components of the recording material to increase saturation in a region having brightness determined to be high, and reducing density values of color components other than a color component having a minimum density value among the plurality of color components of the recording material to decrease saturation in a region having brightness determined to be low.

A computer-readable recording medium having computer-executable instructions for performing outputting image data to an image forming device forming an image on a recording medium with use of a recording material having a plurality of color components, the computer-executable instructions comprising steps of:

• determining a region having higher brightness than predetermined brightness and a region having lower brightness than the predetermined brightness in the image data on the basis of the image data;
• and
• adjusting saturation so as to reduce density values of color components other than a color component having a maximum density value among the plurality of color components of the recording material to increase saturation in a region having brightness determined to be high by the determining step, and reduce density values of color components other than a color component having a minimum density value among the plurality of color components of the recording material to decrease saturation in a region having brightness determined to be low by the determining step.