Patent ID: 7982911
Filing Date: 2011-07-19
Classification: H04N

Abstract:
1. A color conversion coefficient creating device comprising: a storage unit; a display unit that displays a color rendering setting screen that sets a compression coefficient based on a ratio between a plurality of color rendering intents, the ratio being set by a user controlling a graphical user interface; an evaluation unit configured to evaluate an input device characteristic and an output device characteristic according to a predetermined standard device characteristic and the compression coefficient; a creating unit configured to create a color conversion coefficient for converting a first image signal in a first color space input from the input device into a second image signal for the output device in a second color space different from the first color space, wherein the creating unit is configured to change the ratio between the plurality of color rendering intents when a gradation number of the output device is less than a predetermined standard gradation number to a new ratio, the creating unit is configured to change the color rendering intents when a volume of a whole color gamut of the input device is larger than a volume of a predetermined standard whole color gamut or when the volume of the whole color gamut of the output device is smaller than the volume of the predetermined whole standard color gamut, and the creating unit is configured to change the color rendering intents when a maximum saturation of primary colors in a color gamut of the output device is lower than a maximum saturation of primary colors in a predetermined standard color gamut, or when the maximum saturation of the primary colors in the color gamut in the input device is higher than the maximum saturation of the primary colors in the predetermined standard color gamut; and a determining unit that determines if a color conversion look-up table in the storage unit exists based on the set ratio, wherein if the determining unit determines that the color conversion look-up table does not exist, then the evaluation unit evaluates the input device characteristic and output device characteristic, the display unit displays a color rendering intent re-setting screen for re-setting the compression coefficient based on the new ratio if the evaluated input device characteristic and the output device characteristic is not within the predetermined standard device characteristic, the new ratio only being set if the user agrees, and the creating unit creates the color conversion coefficient based on the re-set compression coefficient if the user agrees from the color rendering intent re-setting screen, and based on the set compression coefficient if at least one of two conditions are met: 1) the user does not agree from the color rendering intent re-setting screen, and 2) the evaluated input device characteristic and the output device characteristic is within the predetermined standard device characteristic, and the creating unit stores a color conversion look-up table based on the created color conversion coefficient in the storage unit.