Patent ID: 7589874
Filing Date: 2009-09-15
Classification: H04N

Abstract:
1. A method of converting color data in an input gamut into an output gamut larger than the input gamut, the method being performed by a color processing apparatus including an arithmetic unit, the method comprising: inputting information of the input gamut and the output gamut; obtaining a plurality of restriction conditions which restrict expansion of a color gamut and respectively correspond to representative hues; generating, by the arithmetic unit, a first condition of converting chroma of current color data in the input gamut based on the information of the input and output gamuts and a restriction condition corresponding to current hue of the current color data; generating, by the arithmetic unit, a second condition of converting lightness of the current color data based on the information of the input and output gamuts; and converting, by the arithmetic unit, the current color data into the output gamut using the first and second conditions, wherein maximum chroma in the input gamut of the current hue is converted into restricted chroma corresponding to the restriction condition of the first condition, and the restricted chroma is larger than the maximum chroma in the input gamut and is smaller than maximum chroma in the output gamut of the current hue, wherein maximum lightness in the input gamut of the current hue is converted into maximum lightness in the output gamut of the current hue by the second condition, and wherein the restriction condition corresponding to the current hue is interpolated from the plurality of restriction conditions.