1. An image processing apparatus comprising at least one processor coupled to at least one memory, the at least one processor being programmed to: input a color signal representing an image and an image quality signal representing a texture of the image; convert the image quality signal into a physical quantity signal representing a physical quantity; and determine a color material amount for outputting the image based on the color signal and the physical quantity signal, wherein the image quality signal includes a signal representing glossiness value and a signal representing gloss clarity, and the physical quantity corresponding to the signal representing the glossiness value and the physical quantity corresponding to the signal representing the gloss clarity are a refractive index and a surface roughness of the image, wherein a correlation between the physical quantity signal and the color material amount is higher than a correlation between the image quality signal and the color material amount.