Patent ID: 7152946
Filing Date: 2006-12-26
Classification: B41J

Abstract:
1. A method for printing grey scale images on a printing medium, the method comprising: delivering a first number of first droplets of printing material of a colour with a first volume from a first printhead, the first printhead having only first marking elements for delivering said first droplets of a single volume equal to said first volume, said first marking elements positioned at a fixed pitch from each other; delivering a second number of second droplets of printing material of a second colour with a second volume from a second printhead, the first volume and the second volume being different, the second printhead having only second marking elements for delivering said second droplets of a single volume equal to said second volume, said second marking elements positioned at said same fixed pitch from each other; and depositing said first number of first droplets and said second number of second droplets at exactly the same place on a target pixel position on the printing medium to obtain a given greyscale dot on the printing medium, the method forming greyscale dots at said same fixed pitch on the printing medium.