A tincture adjustment value used to adjust a monochrome signal to a tincture desired by a user is set, and a tincture conversion table and chromaticity line table are generated based on that tincture adjustment value and the profile of an image output apparatus. Using the generated tables, a lightness signal L* corresponding to an input monochrome signal is converted into a distance signal l on a chromaticity line, and the distance signal l is converted into a chromaticity signal (a*, b*). The lightness signal L* and chromaticity signal (a*, b*) are converted into a color signal of the image output apparatus.

Methods and systems for simulating dental whitening. A two-dimensional (2D) image of a patient's oral cavity may be converted from a first color space to a CIELAB color space. A change in a blue-yellow color value (delta b value) with which to whiten the patient's teeth may be selected to increase a blue hue and decrease a yellow hue in the 2D image. A threshold lightness value of individual teeth in the 2D image may be identified. The 2D image in the CIELAB color space may be transformed by adjusting delta b values of each tooth based, at least in part, on an evaluation of a lightness value of each tooth relative to the threshold lightness value to form a whitened 2D image. Adjusting the delta b values may include limiting the delta b values to within a predetermined range. A whitened 2D image may be outputted.