(57) A method for generating a latent image on a substrate surface using a low current
(e.g. less than 2 x 10-' amperes) electrical discharge. The apparatus may include
a movable carriage or roll (10) adapted to support a coated plate (20) and move it
past an imaging assembly (30). The discharge is maintained by a voltage source (60)
controlled by switching means (65) in response to a pattern data processor (55). The
invention may be used, for example, to image lithographic plates, which plates may
or may not contain a light-sensitive material, from a digital source of image data.
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