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 processor; and a first memory storing a program which, when executed by the first processor, causes the imaging apparatus to: generate a main image and a sub image, a data amount of the sub image being smaller than a data amount of the main image; store the main image and the sub image in association with an image ID; transmit the image ID and the sub image to the information setting apparatus; and transmit the image ID and the main image to the information generation apparatus which is different from the information setting apparatus, the information setting apparatus comprises: a second processor; and a second memory storing a program which, when executed by the second processor, causes the information setting apparatus to: execute a development process on the sub image and set an adjustment value for use in the development process; and transmit the image ID and the adjustment value to the information management apparatus, the information management apparatus comprises: a third processor; and a third memory storing a program which, when executed by the third processor, causes the information management apparatus to: store the image ID and the adjustment value in association with each other; receive the image ID from the information generation apparatus; and transmit the adjustment value stored in association with the image ID to the information generation apparatus, and the information generation apparatus comprises a fourth processor; and a fourth memory storing a program which, when executed by the fourth processor, causes the information generation apparatus to: execute a development process on the main image using the adjustment value and generate the results of the development process.