Abstract: Image plane registration errors are corrected for a multi-channel printing system that prints on a continuous web of media. Nominal in-track line spacing are defined for each image plane, and are used to print lines of image data for each image plane. An in-track registration error is measured for a misregistered image plane in the printed image, and is used to determine an adjusted in-track line spacing that will bring the misregistered image plane back into registration in the in-track direction over a predefined correction time interval. Additional image data is then printed using the adjusted in-track line spacing during the correction time interval, after which image data is printed using a new in-track line spacing that is different from the adjusted in-track line spacing.

Abstract: Image plane registration errors are corrected for a multi-channel printing system that prints on a continuous web of media. Nominal in-track line spacing are defined for each image plane, and are used to print lines of image data for each image plane. An in-track registration error is measured for a misregistered image plane in the printed image, and is used to determine an adjusted in-track line spacing that will bring the misregistered image plane back into registration in the in-track direction over a predefined correction time interval. Additional image data is then printed using the adjusted in-track line spacing during the correction time interval, after which image data is printed using a new in-track line spacing that is different from the adjusted in-track line spacing.

Abstract: A method for adjusting an encoder pulse count delay in a printing system for printing on a continuous web of print media using first and second printheads. First and second encoders are provided at different positions along the media transport path. An initial encoder pulse count delay is provided for use in printing with the second printhead. An initial ratio of the first encoder pulse rate to the second encoder pulse rate is determined. At a subsequent time a subsequent ratio of the first encoder pulse rate to the second encoder pulse rate is determined. An adjusted encoder pulse count delay is determined by adjusting the initial encoder pulse count delay responsive to the initial ratio and the subsequent ratio and used to control printing by the second printhead.