An integrated computerized system for use in color printing having at least one digital representation of a color characteristic of at least one page to be printed and a digital storage memory for storing the digital representation. A switching device receives calls from a plurality of users desiring to access the listings and an operator terminal receives the communication from the switching device and retrieves a listing from the first database. The second layer also has a conduction band offset that is relatively high. In one embodiment, if more than one source file exists that can be used to generate a given target file, the rule with the highest priority is used. The detection sensitivity of one of the upper detecting portion or the lower detecting portion is lower than the detection sensitivity of the other.