Importance

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Abstract

A method of producing a printed output on a substrate is provided using a drop emitting device which is adapted to emit a plurality of ink quantities in response to a control signal. The method comprises the steps of receiving image data corresponding to a pixel of an image to be printed, the received image data comprising a tone value; generating a threshold value for use in a screening operation based on the location of the pixel within the image to be printed; mapping the received tone value to a mapped tone value using a first tone mapping, the mapped tone value being generated based on the received tone value; performing the screening operation by comparing the mapped tone value with the threshold value; mapping the received tone value to a control signal value using a first control mapping if the output of the comparison performed in the previous step indicates a first relationship, the control signal value being generated based on the received tone value; and repeating the previous three steps if the output of the comparison performed in the previous step indicates a second relationship, wherein the first mapping step comprises using an alternate tone mapping and the second mapping step comprises using an alternate control mapping.

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First Claim