Patent ID: 7999826
Filing Date: 2011-08-16
Classification: G09G,H04N

Abstract:
1. A color conversion device that color-converts colors of input image data into colors used in a display unit for displaying images using at least white, the device, implemented as a suitably programmed processor or as a circuit, comprising: a ratio calculating unit that calculates a lightness ratio and a saturation ratio between a color reproduction range in a standard color space and a color reproduction range in colors used by the display unit in L*a*b* space at least when a color outside of the color reproduction range in colors used by the display unit is calculated; and a color compressing unit that performs color compression on the image data based on the ratios calculated by the ratio calculating unit; wherein the color compressing unit color-compresses data representing lightness in the image data based on the lightness ratio and color-compresses data representing saturation in the image data based on the saturation ratio; wherein the color compressing unit color-compresses only the data representing saturation and does not color-compress the data representing lightness for colors in a high lightness region, does not color-compress either the data representing lightness or the data representing saturation for colors on a gray axis, and color-compresses both the data representing lightness and the data representing saturation for colors other than the colors in the high lightness region or the colors on the gray axis; and wherein the high lightness region is defined based on a point at which the saturation is lower in a high lightness direction, other than a point at which the saturation is the highest in each hue in the L*a*b* space.