Data conversion table changing

A method of converting color component data, comprising the steps of:

• (a) providing a data conversion table that converts color component data of a first color system to converted color component data for at least one color component of a second color system;
• (b) changing first values of converted color component data in said data conversion table for a specific combination of color component data of said first color system, thereby obtaining first changed values;
• (c) changing second values of converted color component data in said data conversion table for other combinations of color component data of said first color system other than said specific combination;
• and
• (d) converting, with said data conversion table, the color component data of said first color system to the converted color component data of said second color system;
• and wherein
• said step (c) comprises the steps of:
• (1) determining differences between said first values and said first changed values;
• (2) determining non-subject combinations of color component data of said first color system for which values of converted color component data are not to be changed;
• (3) assuming an equation representing spatial distribution of differences to be used in said changing said second values for said other combinations in a color space of said first color system;
• and
• (4) solving said equation to determine said differences to be used in said changing said second values for said other combinations other than said specific combination, under conditions that the differences for said specific combination are equal to the differences determined at step (1) and that the differences for said non-subject combinations are equal to zero.