1. An image processing apparatus, which has multiple image processing functions, for processing an input image using an image processing function that has been set at the time of image input, comprising: a designating unit adapted to designate a processing mode for using any of the plurality of image processing functions to be applied to an image of interest; an extracting unit adapted to read a print medium on which the image of interest has been printed, and extract, based upon the reading of the print medium, an identification indicator representing setup information to be used for processing the image of interest; an analyzing unit adapted to analyze the identification indicator and acquire the setup information; and a processing unit adapted to process the image of interest, after the print medium has been read, using the image processing function associated with the designated processing mode according to particular setup information, among the setup information acquired by said analyzing unit, wherein the particular setup information is associated with and indicates settings for the image processing function associated with the designated processing mode, wherein the processing unit is adapted to use the particular setup information for executing the image processing function associated with the designated processing mode to process the image of interest, and wherein the setup information acquired by said analyzing unit indicates settings dictating how each of the plurality of image processing functions should operate.