A method of recording image data on a record medium, in which at least two radiation beams impinge on a rotating reflector such that the beams are reflected onto a record medium and scanned across the record medium and the reflector rotates. Relative movement is caused between the reflector and the record medium in the directional parallel with the rotational axis of the reflector. The beams are modulated with image information so that the radiation beams expose pixels on the record medium spaced apart along respective scan lines. The angle at which the beams impinge on the reflector is adjusted so that the scan lines coincide to define a common scan line and the pixels exposed by each beam are interleaved along the common scan line.