Patent ID: 7710605

Claim:
A print system including a computer and a printer, the print system being for printing image data having pseudo gradation generated by using a dither pattern by the printer, wherein the computer divides the image data into predetermined areas, determines whether or not a dot arrangement pattern of image data in each of the areas matches a dot arrangement pattern that is obtained by a binarization process that uses imaginary uniform image data and the dither pattern, determines a representative value concerning a density of image data within the area if the dot arrangement pattern of the area matches the dot arrangement pattern for the imaginary uniform image data, and sends data related to the determined representative value to the printer, and the printer obtains the representative value of each area from data that are received from the computer and compares the obtained representative value with the dither pattern so as to reproduce a dot pattern, wherein the representative value is a value “a” that satisfies the condition J≧a≧K, wherein a dot for a given pixel is formed if a density value of the given pixel is smaller than a density value of a pixel in a corresponding part of the dither pattern, “J” is a minimum value of upper limit density values of pixels of the dither pattern corresponding to the dots that were formed in the area and “K” is a maximum value of lower limit density values of pixels of the dither pattern corresponding to dots that were not formed in the area.