Other Uses For The Technique
Contact printing was also once used in photolithography, and in printed circuit manufacturing.
The contact exposure process usually refers to a film negative used in conjunction with printing paper, but the process may be used with any transparent or translucent original image printed by contact onto a light sensitive material. Negatives or positives on film or even paper may for various purposes be used to make contact exposures onto different films and papers. Intermediary products such as internegatives, interpositives, enlarged negatives, and contrast controlling masks are often made using contact exposures.
Computer screens and other electronic display devices provide an alternative approach to contact printing. A permanent image (negative, positive film or transparency, or translucent original) is not used, instead the light sensitive material is exposed directly to the display device in a dark room for a controllable duration. The resulting image generated by this mixed digital/analogue technique has been coined "laptopogram". While limited by the image display device resolution, which can be much inferior to film negatives, the widespread use of electronic displays provides great potential to this unorthodox contact printing method.
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