| 摘要 |
This patent application discloses a method and apparatus useful for eight-level halftone thermal ink jet printing by printing with droplets of ink with volumes weighted in a binary sequence. Three (3) binary-weighted drop generators which are fired in sequence are useful in an eight-level, four color printing process and additionally may be employed with a clear ink vehicle drop generator in order to reduce optical density of single small dots in a given pixel area to thereby reduce grainyness. This method and apparatus are also adapted for four color printing with a chosen number of rows of binary-weighted drop generators, including untoned vehicle if desired, in order to achieve color printing of pixels having desired color and optical density.
|
