In the case of performing halftone processing using a threshold value matrix, the memory capacity for storing the threshold value matrix is reduced without reducing the image quality of an output image. An image processing apparatus that generates a halftone image by performing halftone processing using a threshold value matrix for each piece of image data of a plurality of color planes corresponding to color materials used for printing processing, and the number of bits of a threshold value in a first threshold value matrix for a color plane whose visibility is relatively low of the plurality of color planes is smaller than the number of bits of a threshold value in a second threshold value matrix for a color plane whose visibility is relatively high of the plurality of color planes.