Patent ID: 6967747

Claim:
A method of substantially matching a first output produced by a first marking device with a second output produced by a second marking device, the method comprising the steps of: producing a first set of one or more sample tone levels using the first marking device; producing a second set of one or more sample tone levels using the second marking device; comparing the first set of sample tone levels with the second set of sample tone levels; determining one or more calibration set points; generating a custom tone transfer function associated with the first marking device in accordance with the calibration set points; using the custom tone transfer function to produce the first output from the first marking device wherein: the step of using the custom tone transfer function to produce the first output from the first printer further comprises the steps of: reverse halftoning a raster image to divide the raster image into halftone cells; and using the custom tone transfer function to adjust one or more halftone levels associated with the halftone cells.