| 摘要 |
<p>The invention is directed to a method of printing with an ink jet printer using inks of the same hue but of different saturation. The method utilizes a single dither array to control the printing application of the ink, preferably a full strength ink and a dilute ink to achieve gray scale printing. The dither array has threshold values defined for a subset of values of the range of pixel values of an image area, preferably 50 % thereof, corresponding generally to threshold values between 0 and 127 inclusive. Pixel values are determined to be either within or outside of the threshold array range. Consequently, an ink dot is either printed or not utilizing either the dilute or full strength ink. If the pixel value is within the threshold array range the pixel value is then compared to the threshold value of the overlaid cell of the dither array. Where the pixel value is greater than the corresponding threshold value, an ink dot is printed utilizing dilute ink, else no dot is printed. If the pixel value is determined to be outside the threshold array range, a predetermined value is subtracted from the pixel value resulting in a difference pixel value. The difference pixel value is then compared to the threshold value of the overlaid cell of the dither array. If the difference pixel value is greater than the corresponding threshold value a full strength ink dot is printed, else a dilute ink dot is printed.</p> |
