Image processing device, image processing method, and computer program product

An image processing device includes: an automatic color determining module that determines whether an image read from an original is a color image or a monochrome image according to a color determination result obtained by a color determining module; a color determination difference detecting module that detects a difference between a color determination result obtained by the color determining module with respect to a test pattern output on a recording medium and a color determination result obtained by the color determining module with respect to the test pattern output on a standard recording medium; and an automatic color selection condition adjusting module that adjusts a white pixel determination threshold and a black pixel determination threshold used for determination by the automatic color determining module according to a color determination difference detection result obtained by the color determination difference detecting module.