The invention provides a method of reducing jitter error in a laser scanning system (1) adapted to produce a scanned image comprising a number of lines of an object (18). The method comprising the steps of providing a reference object (22) arranged such that the scanned image produced by the laser scanning system (1) includes a reference image (24) of the reference object (22) processing the reference image (24) to calculate an error arising from non-repeatable displacement of the lines of the reference image (24) and adjusting at least one operating parameter of the laser scanning system (1) in response to the calculated error.
