PHOTOMECHANICAL APPARATUS FOR MANIPULATING IMAGE FORM

摘要

Photomechanical apparatus and procedures are applied to obtain controlled manipulations of image representations having particular unity in topographic mapping including slope mapping, relief mapping, and symbol discrimination. Negative and positive transparencies are made photographic copy in the apparatus for enabling production of enhanced and reduced versions of representations, respectively. Spaced beams from revolving light sources are directed to pass through such copy so as to expose photographic film materials maintained spaced from the copy. Selective adjustments of light spacing and dispositions and exposure limits in the apparatus adapt it for use in differing procedures.