System including image forming apparatus and lattice point group generating device that generates group of pre-color conversion lattice points to be contained in color conversion table used for conversion of colors in RGB color space to colors in CMYK color space in the image forming apparatus

摘要

A lattice point group generating method generates a group of pre-color conversion lattice points to be contained in a color conversion table for conversion of colors in a color space having three channels to colors in another color space. The method includes generating sequences and generating lattice points. The generating sequences generates three van der Corput sequences in which the number of terms is equal to a quotient obtained by subtracting a specified number from a maximum number of lattice points allocatable to the color conversion table and dividing the difference by 12 or 6, and whose basis is a positive integer greater than or equal to 2. The generating lattice points generates lattice points each located at coordinates including terms in the same ordinal number out of the three respective van der Corput sequences for six possible associations of the three van der Corput sequences with the three channels.