Abstract: A method of and system for compensating artwork for coverage gain that occurs during reproducing of the artwork on a reproduction system. The artwork includes one or more graphic elements. The method includes characterizing the reproduction system, selecting one or more graphic elements of the artwork, and automatically modifying the artwork by causing a spread or choke to the selected graphic elements of the artwork by an amount determined according to the results of the characterization step. Reproducing the modified artwork on the reproduction system reduces the coverage gain effects.

Abstract: In scanning devices used for opto-mechanical processing of a substrate covered with a photo-sensitive material, it is highly desirable to be able to achieve accurate control of the carriage utilized for scanning the substrate. To accomplish this, the carriage is moved along a rectilinear guide by use of a linear motor, preferably under computer control. The linear motor includes a winding which is composed of a number of isolated conductors attached to the rectilinear guide orthogonally to the longitudinal axis of the guide. The winding is connected to the control computer through a controllable current source. The linear motor also includes a solid-state commutator coupled to magnetically propel the carriage in accordance with current supplied to the winding from the controllable current source based on instructions from the control computer.