Color processing apparatus, color processing method, color gamut setting apparatus, color gamut setting method, recording medium storing color processing program and recording medium storing color gamut setting program

A color processing method for converting a target M-dimensional color signal in an input color space into an N-dimensional output color signal in an output color space where M and N are natural numbers and N>M, the method comprising:

• uniquely calculating (N−M) colorants of the converted output color signal from the target color signal with using plural color-signal pairs, in each pair, corresponding one of the (N−M) colorants of an output color signal in the output color space are associated with an input color signal in the input color space;
• and
• calculating the M colorants of the converted output color signal from the target color signal and the (N−M) colorants of the converted output color signal calculated.

A computer readable medium storing a program causing a computer to execute a process for converting a target M-dimensional color signal in an input color space into an N-dimensional output color signal in an output color space where M and N are natural numbers and N>M, the process comprising:

• uniquely calculating (N−M) colorants of the converted output color signal from the target color signal with using plural color-signal pairs, in each pair, corresponding one of the (N−M) colorants of an output color signal in the output color space are associated with an input color signal in the input color space;
• and
• calculating the M colorants of the converted output color signal from the target color signal and the (N−M) colorants of the converted output color signal calculated.

A computer readable medium storing a program causing a computer to execute a process for setting a color gamut, the process comprising:

• setting the color gamut in an output color space to which output color signals belong to, wherein:
• each output color signal comprises primary colorants and extra colorants,
• each output color signal corresponds to an input color signal belonging to an input color space, and the extra colorants of each output color signal is uniquely associated with the corresponding input color signal in the set color gamut.