Patent ID: 7434906

Claim:
A method for converting a printing data, comprising: receiving an original image with an original resolution; converting the original image to an ink drop image, wherein a pixel value of the ink drop image is represented by a corresponding number of ink drops per unit area; equally distributing the corresponding number of ink drops of the ink drop image to a corresponding position for a desired resolution to produce a printing ink drop image corresponding to the new resolution, where the number of ink drops of the printing ink drop image is equal to the number of ink drops of the ink drop image; converting the printing ink drop image to a printing halftone image; and outputting the printing halftone image, wherein the step of equally distributing comprises: dividing the number of corresponding ink drops by a ratio of the desired resolution to the original resolution to obtain a number of converting ink drops, and equally distributing the converting ink drops at corresponding positions for the desired resolution to form the printing ink drop image, wherein when the number of converting ink drops is not an integer, the sum of ink drops deposited on the corresponding positions for the desired resolution and the sum of ink drops for the original resolution must be equal.