Patent ID: 8254001

Claim:
A color gamut data creating device comprising: a receiving unit configured to receive measurement points concerning an image forming device, the measurement points being defined in a color space, the color space having an achromatic axis and an axis perpendicular to the achromatic axis, the color space representing hue by a hue angle defined from the axis perpendicular to the achromatic axis, representing lightness along the achromatic axis, and representing saturation by a distance from the achromatic axis; a target plane determining unit configured to determine a saturation distribution based on the measurement points, the saturation distribution defining a maximum saturation reproducible by the image forming device at each of a plurality of hue angles, the target plane determining unit further configured to determine a plurality of target planes, each target plane having a fixed hue angle and including the chromatic axis, a distribution of the plurality of target planes being varied to maintain a difference between a maximum saturation at a hue angle of each target plane and a maximum saturation at a hue angle of another target plane that is adjacent to the each target plane below a prescribed value; a locating unit configured to project, on each target plane, those measurement points that are within a prescribed range relative to the subject target plane; and a color gamut creating unit configured to create color gamut data indicative of a distribution range of the measurement points projected on each target plane.