Method and apparatus for halftone reproduction of continuous tone radiographic images

摘要

A multilevel halftone reproduction transparency medium and a method and system for reproducing images thereon. The transparency medium includes a substantially transparent carrier having first and second planar surfaces with ablative dye coatings thereon which are selected to render the medium substantially opaque in non-ablated areas, transparent in fully ablated areas, and semi-opaque in areas where one or the other of the coatings is ablated. A method and apparatus employ the medium to provide binary, trinary and quarternary gray levels in a hybrid halftone printing technique especially useful for printing radiographic images.