1. An image processing system comprising: a digital printer; and a server to communicate image information, including first image information and second image information, with an offset printer and the digital printer via a network, respectively, the server including first circuitry to perform first processing to generate, based on the first image information used for outputting a first image, first raster data to be used to generate a plate, the plate to be used by the offset printer in printing the first image, the digital printer including second circuitry to perform second processing to generate second raster data based on the second image information acquired from the server, and to control the digital printer to form a second image based on the second raster data, wherein the second processing performed by the second circuitry of the digital printer to generate the second raster data and the first processing performed by the first circuitry of the server to generate the first raster data are substantially the same.