Printing plate registration

Imaging apparatus comprising:

• a rotatable imaging drum adapted for supporting recording media;
• a motion system adapted to rotate the imaging drum about an axis of the imaging drum;
• a carriage adapted for moving an imaging head along a path relative the imaging drum while directing radiation beams to form an image on the supported recording media;
• a rotary encoder adapted for determining incremental rotational positions of the imaging drum;
• one or more controllers programmed to position the imaging drum at a desired first incremental rotational position, the one or more controllers being further programmed to operate the motion system to apply rotational drive to the imaging drum to correct for positional deviations from the desired first incremental rotational position occurring after the imaging drum has been positioned at the desired first incremental position;
• a drum brake adapted for holding the imaging drum stationary, wherein the one or more controllers are programmed to operate the drum brake to hold the imaging drum while the rotational drive is applied to the imaging drum to correct for the positional deviations from the desired first incremental rotational position;
• and
• a sensor adapted for detecting one or more points on a edge of the supported recording media.