1. An image processing system comprising: a control section using at least one central processing unit (CPU) for functioning as: a setting section that sets a process condition of electrophotographic image formation suited to reading of an information image that represents data by a coded pattern, wherein an image includes the information image; and an image processing section that performs an image process for preventing degradation, in image quality, of the image other than the information image under the process condition set through the setting section, wherein the image process performed by the image processing section includes a process of thickening a line whose width is smaller than a minimum width of a solid line contained in the information image.