Interacting print enhancement techniques.

摘要

Print enhancement circuits (202) for an electrophotographic printing machine are placed between the character generator (200) and the printhead to modify drive signals for the printhead. Modifications include smoothing the digitized edges of slanted lines; broadening single pel width lines in the direction perpendicular to the scan direction as well as in the direction parallel to scan. Inhibiting circuits are provided to prevent passage of enhancement signals under certain conditions. Generally, leading and trailing edge gray signals are provided next to all black data in a direction parallel to scan while expanded black signals are provided for single pel data in a direction perpendicular to scan by adding to the black signal on both its leading and trailing edges.