Color conversion device, color conversion method, color conversion program, recording medium recording color conversion program, image processing device, and image display device

The color conversion device according to claim wherein the display unit provides display using Red, Green, Blue, and White.

A color conversion method that color-converts colors of input image data into colors used in a display unit for displaying images using at least white, the method comprising:

• calculating a lightness ratio and a saturation ratio between a color reproduction range in the 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 or the color reproduction range in colors used by the display unit is calculated;
• and
• performing color compression on the image data based on the ratios calculated by the ratio calculating unit.

A computer-readable recording medium that records a color conversion program that color-converts colors of input image data into colors used in a display unit for displaying images using at least white, the program allow a computer to function as:

• a ratio calculating unit that calculates a lightness ratio and a saturation ratio between a color reproduction range in the 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.