A color look up table adjusting apparatus includes: a color gamut acquisition unit that determines a color gamut from an image output by an image forming apparatus, and determines, from an image output by another image forming apparatus, a position of input color values in a color space as a target point; an interpolation process unit that calculates a point corresponding to the target point within the color gamut of the image forming apparatus as an adjustment point; a color value adjustment table generating unit that generates a color value adjustment table for converting the input color values into input color values corresponding to a position of the adjustment point; and a table organization unit that converts arbitrary input color values based on the color value adjustment table, and inputs input color values obtained after the conversion as input color values based on a color look up table.