| 摘要 |
A method of printing an image on a recording medium with a liquid ink printhead moving in a scanning direction having drop ejectors depositing ink drops on a recording medium at a given default frequency and in a plurality of pixel locations spaced by a predetermined resolution, the method comprising the steps of (a) determining a pixel size drop volume of liquid ink necessary at the predetermined resolution to fill one of the pixel locations; (b) determining a reduced subpixel size drop volume of liquid ink for subpixel drops to be printed by dividing the pixel size drop volume by a factor of at least three; (c) determining a frequency for firing and printing the subpixel drops in a fast scan direction such that a succeeding subpixel drop lands on the recording medium before a preceding subpixel drop has completely spread, and so as to preserve throughput; and (d) firing and depositing multiple subpixel drops each having the determined reduced volume of liquid ink, at the determined frequency, and in a shingled overlapping manner in which adjacent subpixel drops overlap by at least one third the diameter of the overlapped subpixel drop, thereby resulting in synergistic slow scan direction combined spreading, and thereby enabling a relatively high number of gray scale levels, and high quality printed images.
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