Patent ID: 6452696
Filing Date: 2002-09-17
Classification: G06K,H04N

Abstract:
Apparatus responsive to a digital image file comprising data defining a variable print density for each of multiple pixels for producing a continuous tone and/or color composite image on a photosensitive material, said apparatus comprising:a head comprised of a plurality of light sources each individually energizable by a drive signal supplied thereto for exposing said photosensitive material to produce a variable density pixel image thereon; control circuitry for producing drive signals configured to normalize the light output from said plurality of light sources over a range of print density levels, said control circuitry comprising: means for producing a variable correction value for each light source which correction value is dependent upon the print density level of the pixel image to be produced; and means for producing drive signals of variable amplitude and/or duration in response to said digital image file data and said produced variable correction values; and means for applying said drive signals to said light sources.