Identifier: halftoneprocessp00verf (find matches)
Title: The half-tone process. A practical manual of photo-engraving in half-tone on zinc, copper, and brass
Year: 1904 (1900s)
Authors: Verfasser, Julius
Subjects: Photoengraving
Publisher: London, Iliffe & sons, limited
Contributing Library: Getty Research Institute
Digitizing Sponsor: Getty Research Institute

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hic image is passing through the screen that themechanical continuity is broken. A greater amountof detail and better colour values are said to besecured. Levy, however, announces now that, owing to thegreat difficulties of producing these screens, he hasabandoned their manufacture. A peculiar effect of the four-line screen is thatwhere a straight line is reproduced by the ordinaryscreen it will have a saw-tooth edge, whilst thefour-line screen will reproduce it straight and cleanto the eye. Levy has also taken up the manufacture of a chess-board screen, a method of making which was originallypatented by E. Deville. This screen has not at thetime of writing come into general use. What are called irregular grain screens have beenlargely pushed of late years, but without theirsuperiority over the cross-line screen being demon-strated. They can only be used as supplementaryto the ruled screens for special purposes, and forsuitable subjects. As commonly understood, irregular grain screens
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