Abstract: A image forming apparatus includes a color conversion unit, a toner-level-specifying unit and a color-conversion-properties-setting unit. The color conversion unit executes a color conversion process for converting input image data to image data for each color of a plurality of color toners. The toner-level-specifying unit specifies the levels of the plurality of color toners. The color-conversion-properties-setting unit causes adjusted input/output properties to be set in the color conversion unit as input/output properties for the color conversion process when the input image data has a saturation that is less than a predetermined value, the adjusted input/output properties being such that the amount used of the color toner having the lowest level is less than in predetermined standard input/output properties.

Abstract: An image reading device includes: a light source irradiating a reading target with light; an image sensor receiving incoming reflection light from the reading target and reading the reading target; a plurality of kinds of white reference plates of mutually different brightness levels provided for acquiring a white reference in shading correction; an input part accepting input of selection, as a mode for document reading, between a character mode prioritizing character reproduction and a photo mode prioritizing figure and photo reproduction; and a shading correction part, when the character mode has been selected, perform the shading correction by defining the white reference based on output of the image sensor when the character-mode white reference plate darker than the photo-mode white reference plate has been read.

Abstract: An image reading device includes: a light source irradiating a reading target with light; an image sensor receiving incoming reflection light from the reading target and reading the reading target; a plurality of kinds of white reference plates of mutually different brightness levels provided for acquiring a white reference in shading correction; an input part accepting input of selection, as a mode for document reading, between a character mode prioritizing character reproduction and a photo mode prioritizing figure and photo reproduction; and a shading correction part, when the character mode has been selected, perform the shading correction by defining the white reference based on output of the image sensor when the character-mode white reference plate darker than the photo-mode white reference plate has been read.

Abstract: An area separating apparatus for judging whether or not each object pixel belongs to a photograph image area in an image.

Abstract: An area separating apparatus for judging whether or not each object pixel belongs to a photograph image area in an image.