Abstract: A system for controlling a printing device, capable of letting a specific user temporarily occupy a specific cassette or a specific sheet output position under certain conditions during the process of driving a printing device connected to a plurality of user computers through a network, thus preventing specific contents from being undesirably printed by another user when the specific user prints the specific contents using printing sheets, and a method therefor are provided, including the steps of initializing a printing device controller and a printing device by applying electric power to a manipulation panel, a printing device controller, and a printing device; setting an exclusive use with respect to the cassette and the sheet outputting position of a printing device under predetermined set conditions, in response to an input from the manipulation panel or the host computer; and printing specific contents in the cassette and the sheet outputting position of the printing device which are set to be exclusiv

Abstract: A color image printing apparatus includes a controller having a plurality of under color tables in which an under color concentration value for black developer, to be used as a substitute for color developer, corresponding to a common concentration value included in each of the three primary colors of yellow, magenta and cyan constituting a pixel display color of the original image, is set differently for a non-toner saving mode than for a toner saving mode, for outputting an under color concentration value for black determined, corresponding to the common concentration value and net concentration data for yellow, magenta and cyan which are obtained by deducting the under color concentration value from concentration data of each pixel display color of the original image, from the under color table corresponding to the toner consumption, an engine for printing a color image on a recording medium with the concentration of developer per color corresponding to the net concentration data for yellow, magenta and cy