An apparatus and method of efficiently forming an image of print data even if the residual amount of toner or ink of a specified color is insufficient. The method includes calculating an amount of ink or toner of each color that is required to form the image of the print data, comparing the calculated...http://www.google.com.au/patents/US7907294?utm_source=gb-gplus-sharePatent US7907294 - Apparatus to print print data when colors contained in cartridge are insufficient and method thereof
