A reproduction apparatus includes a plurality of recording elements, for exampl, LED's, arranged in a row along the length of the printhead. An image scanner scans an original document sheet to generate data signals related to the information on the sheet. In rasterizing the data for reproduction by the printhead upon a photoreceptor, means are provided for locating a pictorial portion on the document sheet which will require screening during the reproduction process. Image information comprising text and charts not in the area determined to include the pictorial information is reproduced at a resolution of N.times.M dots per square inch. Image information including text, etc., in the area determined to include the pictorial information is reproduced at N.times.(L.times.M) dots per square inch. The apparatus also includes means for providing additional emissions of the light emitting diodes, in response to photoreceptor travel, for correcting for nonuniformities in emissions of the LED's. Respective strobe pulses for enabling the LED's are selected in accordance with the type of exposure.