Calibration of color devices

1. A method of adjusting a non-black primary color value comprising:

determining a gray component of the non-black primary color value that contributes to a gray color;

determining a secondary color component of the non-black primary color value that contributes to a secondary color;

determining a primary component of the non-black primary color value that does not contribute to the gray color or the secondary color;

determining a gray balancing contribution using a one-dimensional gray balancing related primary color look-up table and the gray component, wherein the primary color value is used as an index to the one-dimensional gray balancing related primary color look-up table;

determining a secondary color contribution using a one-dimensional secondary color related primary color look-up table and the secondary color component, wherein the primary color value is used as an index to the one-dimensional secondary color related primary color look-up table;

determining a primary color contribution using a one-dimensional primary component related primary color look-up table and the primary component, wherein the primary color value is used as an index to the one-dimensional primary component related primary color look-up table; and

summing the gray contribution, the secondary color contribution and the primary color contribution.

2. The method of claim 1 wherein determining a gray contribution comprises:

obtaining a gray balancing related primary color TRC value from a one-dimensional gray balancing related primary color TRC for balancing gray using the non-black primary color value as an index; and

multiplying the gray balancing related primary color TRC value by a ratio of the gray component to the primary color value.

3. The method of claim 1 wherein determining a gray contribution comprises:

obtaining a normalized gray balancing related primary color TRC value from a normalized one-dimensional gray balancing related primary color TRC for balancing gray using the non-black primary color value as an index; and

multiplying the normalized gray balancing related primary color TRC value by the gray component.

4. The method of claim 1 wherein determining a secondary color contribution component comprises:

obtaining a secondary color related primary color TRC value from a one-dimensional secondary color related primary color TRC using the non-black primary color value as an index; and

multiplying the secondary color related primary color TRC value by a ratio of the secondary color component to the primary color value.

5. The method of claim 1 wherein determining a secondary color contribution component comprises:

obtaining a normalized secondary color related primary color TRC value from a normalized one-dimensional secondary color related primary color TRC using the non-black primary color value as an index; and

multiplying the normalized secondary color related primary color TRC value by the secondary color component.

6. The method of claim 1 wherein determining a primary color contribution comprises:

obtaining a primary component related primary color TRC value from one-dimensional primary component related primary color TRC using the non-black primary color value as an index; and

multiplying the primary component related primary color TRC value by a ratio of the primary component to the primary color value.

7. The method of claim 1 wherein determining a primary color contribution comprises:

obtaining a normalized primary component related primary color TRC value from a normalized one-dimensional primary component related primary color TRC using the non-black primary color value as an index; and

multiplying the normalized primary component related primary color TRC value by the primary component.

8. A method of adjusting a non-black primary color value comprising:

determining first, second and third portions of the non-black primary color value;

determining a first contribution using a first one-dimensional look-up table and the first portion, wherein the primary color value is used as an index to the first one-dimensional look-up table;

determining a second contribution using a second one-dimensional look-up table and the second portion, wherein the primary color value is used as an index to the second one-dimensional look-up table;

determining a third contribution using a third one-dimensional look-up table and the third portion, wherein the primary color value is used as an index to the third one-dimensional look-up table; and

summing the first, second and third contributions.

9. A method of adjusting each of a plurality of associated non-black primary color values comprising:

determining for each non-black primary color value a respective gray component that contributes to a gray color, a respective secondary color component that contributes to a secondary color, and a respective primary component that does not contribute to the gray color or the secondary color;

determining for each non-black primary color a respective gray contribution using a respective gray balancing related one-dimensional look-up table and the respective gray component, wherein the respective non-black primary color value is used as an index to the respective gray balancing related one-dimensional look-up table;

determining for each non-black primary color a respective secondary color contribution using a respective one-dimensional secondary color related look-up table and the respective secondary color component, wherein the respective non-black primary color value is used as an index to the respective one-dimensional secondary color related look-up table;

determining for each non-black primary color a respective primary color contribution using a respective one-dimensional primary component related look-up table and the primary component, wherein the respective non-black primary color value is used as an index to the respective one-dimensional primary component related look-up table; and

summing the respective gray contribution, secondary color contribution, and primary contribution for each non-black primary color to obtain adjusted non-black primary color values.