Color correction apparatus, display apparatus, and color correction method

A color correction apparatus, comprising:

• a first correction unit configured to
• hold a first one-dimensional lookup table, a second one-dimensional lookup table, and a third one-dimensional lookup table that respectively define tone conversion characteristics of a first primary color, a second primary color, and a third primary color, and
• perform tone conversion on a first primary tone value indicating a primary-color amount of said first primary color according to said first one-dimensional lookup table, tone conversion on a second primary tone value indicating a primary-color amount of said second primary color according to said second one-dimensional lookup table, and tone conversion on a third primary tone value indicating a primary-color amount of said third primary color according to said third one-dimensional lookup table to obtain a first secondary tone value indicating a primary-color amount of said first primary color, a second secondary tone value indicating a primary-color amount of said second primary color, and a third secondary tone value indicating a primary-color amount of said third primary color;
• a second correction unit configured to
• hold a fourth one-dimensional lookup table, a fifth one-dimensional lookup table, and a sixth one-dimensional lookup table that define tone conversion characteristics of white, and
• perform tone conversion on said first primary tone value according to said fourth one-dimensional lookup table, tone conversion on said second primary tone value according to said fifth one-dimensional lookup table, and tone conversion on said third primary tone value according to said sixth one-dimensional lookup table to obtain a fourth secondary tone value indicating a primary-color amount of said first primary color, a fifth secondary tone value indicating a primary-color amount of said second primary color, and a sixth secondary tone value indicating a primary-color amount of said third primary color;
• a determination unit configured to
• determine, from said first primary tone value, said second primary tone value, and said third primary tone value, extent of a contribution to a first tertiary tone value indicating a primary-color amount of said first primary color of each of said first secondary tone value and said fourth secondary tone value as extent of a first contribution, extent of a contribution to a second tertiary tone value indicating a primary-color amount of said second primary color of each of said second secondary tone value and said fifth secondary tone value as extent of a second contribution, and extent of a contribution to a third tertiary tone value indicating a primary-color amount of said third primary color of each of said third secondary tone value and said sixth secondary tone value as extent of a third contribution;
• and
• a derivation unit configured to
• derive said first tertiary tone value from said first secondary tone value and said fourth secondary tone value such that the extent of the contribution to said first tertiary tone value of each of said first secondary tone value and said fourth secondary tone value takes on the extent of said first contribution,
• derive said second tertiary tone value from said second secondary tone value and said fifth secondary tone value such that the extent of the contribution to said second tertiary tone value of each of said second secondary tone value and said fifth secondary tone value takes on the extent of said second contribution, and
• derive said third tertiary tone value from said third secondary tone value and said sixth secondary tone value such that the extent of the contribution to said third tertiary tone value of each of said third secondary tone value and said sixth secondary tone value takes on the extent of said third contribution.