Hp Indigo B.v.

Bar-Navi Miki

Gilad Greenberg

Eli Velner

According to some examples, a method comprises successively transferring a series of images from an imaging surface to an intermediate transfer member, ITM, then from the ITM to positions on a web substrate. The method may comprise intermittently adjusting a position at which particular images are transferred to the ITM by a first defined distance laterally across the ITM and by a second defined distance longitudinally with respect to the ITM. The method may comprise adjusting a position at which the particular images are transferred to the web substrate by approximately the first defined distance laterally relative to the ITM and by approximately the second defined distance longitudinally relative to the ITM. The method may comprise, after a first defined number of intermittent position adjustments, changing a direction in which the position is adjusted. A print apparatus and a machine-readable medium are also disclosed.

Adjusting positions of images

A method and system for performing color print quality monitoring for a color printing process, the method includes determining a calibration distance (ZCAL) between a Spectrophotometer () and an associated calibration patch () that provides a maximum luminescence value (LMAX) detected by the Spectrophotometer. The Spectrophotometer () is calibrated at the calibration distance by taking a color reading. A first color patch distance (Z) between the Spectrophotometer and a color calibration patch () printed on a sheet () is determined from a first maximum color patch luminescence value (L). A first color reading of the color calibration patch is taken and a second color patch distance (Z) between the Spectrophotometer and a different area of the color calibration patch () is determined to provide a second maximum color patch luminescence value (L). A second color reading of the color calibration patch is taken and compared with the first color reading to determine if the printing process needs adjusting.

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Ness Ziona, Israel

Bar-Navi Miki