Patent ID: 7733532

Claim:
A printing system comprising: a memory configured to store image data representing an image; and a processor configured to perform a first digital halftone process on a first portion of the image and a second digital halftone process on a second portion of the image, wherein the processor is configured to locate the first portion by comparing an intensity value of a first pixel and an intensity value of a second pixel, wherein the second pixel is adjacent to the first pixel, wherein the first portion is an edge of the image and the second portion is not an edge of the image, and the first digital halftone process comprises a higher resolution than the second digital halftone process, wherein the processor adjusts the intensity value of the first pixel if a difference between the intensity value of the first pixel and the intensity value of the second pixel is greater than a predetermined threshold, and wherein the first digital halftone process determines edge pixel values by selecting one of two nonzero pixel values.