Abstract: The invention relates to a method of printing on a media comprising: providing a printhead 300 comprising a plurality of nozzles (301, . . . , 310, . . . , 319, . . . ) defining a print zone, at least one 310 of the nozzles of the print zone being faulty, the print head comprising within the print zone one or more healthy zones 371, 372; submitting a first region 281 of the media to N print zone passes; and, submitting a second region 282 of the media to M print zone passes using a healthy zone to overlap a faulty nozzle, at least two of the M passes being separated by an advance of the media relative to the printhead; producing alternate first and second regions when printing on the media; whereby M>N and N>0.

Abstract: The invention relates to a calibration method for a printer having a mechanism for advancing a medium in a direction of media advance comprising the following steps: (a) providing a printhead, the printhead having a swath height in the direction of media advance; (b) providing an estimate of either the swath height or the characteristic of the mechanism; (c) printing a base pattern on a medium using the printhead; (d) printing an overlay pattern on the medium using the printhead to form an interference pattern; (e) advance the medium of a predetermined distance using the mechanism at a time between the printing of the base pattern and the printing of the overlay pattern; (f) analyze an optical evaluation of the interference pattern; (g) evaluate as either: (i) the swath height if the characteristic of the mechanism is known or estimated; or (ii) the characteristic of the mechanism if the swath height is known or estimated.

Abstract: The invention relates to a calibration method for a printer having a mechanism for advancing a medium in a direction of media advance comprising the following steps: a- providing a printhead, the printhead having a swath height in the direction of media advance; b- providing an estimate of either the swath height or the characteristic of the mechanism; c- printing a base pattern on a medium using the printhead; d- printing an overlay pattern on the medium using the printhead to form an interference pattern; e- advance the medium of a predetermined distance using the mechanism at a time between the printing of the base pattern and the printing of the overlay pattern; f- analyze an optical evaluation of the interference pattern; g- evaluate as either: i- the swath height if the characteristic of the mechanism is known or estimated; or ii- the characteristic of the mechanism if the swath height is known or estimated.