Patent ID: 6068361
Filing Date: 2000-05-30
Classification: B41J,H04N

Abstract:
A method of producing a print driver, for a color liquid ink printer, depositing drops of ink on a recording medium in response to an input image, including a plurality of input pixels each having a first number of input levels of optical density, to form an output image including a plurality output pixels, each having a second number of output levels of optical density, comprising:determining the second number of the plurality output levels as a function of the first number of the plurality of input levels;assigning a threshold reference signal to each of determined number of the plurality of output levels;assigning a number of ink drops to each of the determined number of the plurality of output levels wherein a portion of the number of ink drops includes a first volume of ink and a remaining portion of the number of ink drops includes a second volume of ink;generating a signal lookup table including the assigned threshold reference signals and the assigned number of ink drops; andproducing a print driver, including an error diffusion circuit, coupled to the signal lookup table, to receive from the signal lookup table one of the assigned threshold reference signals.