Abstract: In an example, a method includes determining a first scaling to be applied to a first print operation and a second scaling to be applied to a second print operation. Each print operation includes selectively removing charge from a charged photoconductor by irradiating the photoconductor in a plurality of scans, forming a first print agent pattern on the photoconductor and delivering the first print agent pattern to a substrate. If the first and second scalings are different, a control instruction may be determined to change the scan-to-scan spacing between the first and second print operations.

Abstract: In an example, a method includes determining a first scaling to be applied to a first print operation and a second scaling to be applied to a second print operation. Each print operation includes selectively removing charge from a charged photoconductor by irradiating the photoconductor in a plurality of scans, forming a first print agent pattern on the photoconductor and delivering the first print agent pattern to a substrate. If the first and second scalings are different, a control instruction may be determined to change the scan-to-scan spacing between the first and second print operations.

Abstract: In one example, a calibration of a print engine may include producing an image by scanning imaging elements along a scan direction, the image having a calibration portion that is continuous or unbroken in a direction perpendicular to the scan direction. Information indicative of an optical measurement of the calibration portion is received. A contribution to the optical measurement associated with each of the laser elements in the group of laser elements is determined. A calibration adjustment for the laser elements in the group of laser elements is determined.