Image processing apparatus, image reproducing system and computer-readable medium

An image processing apparatus comprising:

• a memory that stores first color conversion coefficients that convert image data of a first reference color characteristic of a color space into image data of an output color space and second color conversion coefficients that convert image data of a second reference color characteristic of the color space into image data of the output color space;
• a processor that determines first differences between primary-color chromaticity points of input image data of an input color space and corresponding primary-color chromaticity points of the first reference color characteristic of the color space, determines second differences between the primary-color chromaticity points of the input image data and corresponding primary-color chromaticity points of the second reference color characteristic of the color space, determines one of (i) the first reference color characteristic of the color space as being a matching reference color characteristic of the color space if the first differences are smaller than a threshold value that is a maximum deviation between primary-color chromaticity points and (ii) the second reference color characteristic of the color space as being the matching reference color characteristic of the color space if the second differences are smaller than the threshold value, and converts the input image data of the input color space into output image data of the output color space using the first or second reference color conversion coefficients of the matching reference color characteristic of the color space in response to determining the one of the first reference color characteristic of the color space and the second reference color characteristic of the color space as the matching reference color characteristic of the color space.