1. An information processing system, comprising an information setting apparatus, an information management apparatus, an information generation apparatus, and an imaging apparatus being communicable with the information setting apparatus and the information generation apparatus, wherein the imaging apparatus comprises: a first storage unit configured to store a main image and a sub image in association with an image ID, a data amount of the sub image being smaller than a data amount of the main image; a first transmission unit configured to transmit the image ID and the sub image to the information setting apparatus; and a second transmission unit configured to transmit the image ID and the main image to the information generation apparatus, the information setting apparatus comprises: a setting unit configured to execute a development process on the sub image and set an adjustment value for use in the development process; and a third transmission unit configured to transmit the image ID and the adjustment value to the information management apparatus, the information management apparatus comprises: a second storage unit configured to store the image ID and the adjustment value in association with each other; a first reception unit configured to receive the image ID from the information generation apparatus; and a fourth transmission unit configured to transmit the adjustment value stored in association with the image ID to the information generation apparatus, and the information generation apparatus comprises a generation unit configured to execute a development process on the main image using the adjustment value and generate the results of the development process.