1. A color image processing method comprising: a step of generating, from a primary color image, an intensity image in a hue/saturation/intensity space normalized in a cylindrical coordinate system; a step of analyzing the texture of the intensity image and dividing the intensity image into a plurality of regions based on the result of the analysis; a step of executing density conversion of the intensity image by smoothing a histogram of each region; and a step of generating a primary color image by using the density-converted intensity image.