IMAGE PROCESSING APPARATUS FOR GENERATING COLOR-REDUCED IMAGE, CONTROL METHOD THEREOF, AND STORAGE MEDIUM

An image processing apparatus capable of generating a color-reduced image having high object reproducibility. The image processing apparatus: determines a first representative color(s)/a second representative color/a third representative color, based on an RGB value of a pixel determined to have a high chroma attribute/a low chroma attribute/a low brightness attribute based on a chroma binary image/on a chroma binary image/on a brightness binary image, among pixels constituting an acquired image; generates a converted image by converting the RGB value of the pixel having the high chroma attribute/low chroma attribute into an RGB value indicating the first representative color/second representative color; generates a color-reduced image by converting the RGB value of the pixel determined to have the low brightness attribute among pixels constituting the converted image into an RGB value indicating the third representative color.