An image processing device has a normal output mode for output at a normal image density and a color material save mode for reducing color material consumption. The image processing device includes at least one of plural image processing units configured to perform color space conversion processing, black processing, .gamma. conversion processing, and halftone processing, respectively. The at least one of the plural image processing units for color space conversion processing, black processing, .gamma. conversion processing, and halftone processing includes plural processing units including a processing unit of low processing speed for relatively high image quality and a processing unit of high processing speed for relatively low image quality. In the color material save mode, one or more of the at least one of the plural image processing units for color space conversion processing, black processing, .gamma. conversion processing, and halftone processing execute the processing unit of high processing speed.