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halftone |
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halftone
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The chemical change forms tiny microdots or "pixels" of sepia-yellow colour which make up the image, somewhat in a manner reminiscent of a half-tone reproduction. Includes original foreword and introduction, six chronologically-arranged chapters, separate indices of names and general terms, 682 black-and-white illustrations and twenty-four color and half-tone plates. Exposing the chemical layer in the petri dish with a half-tone image initiates a pattern of oscillating reaction zones that together appear as alternating positive and negative exposures of the image. |
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