A manual of photo-engraving : containing practical instructions for producing photo-engraved plates in relief-line and half-tone with chapters on dry plate development and half-tone color work (1896)
Jenkins, H. (Harry), 1868- · Chicago : Inland Printer · leaf 86
RAGM APERTURE. Whether the half-tone negative shall have detailor contrast depends to a great extent upon thearea of the aperture in the diaphragm used duringexposure. If the exposure is made with a smallaperture the resulting negative will, upon examina-tion, be found to have the dots in the high… … HALF-TONE FROM PHOTOGRAPH.With ornamented background. MANUAL OF PHOTO-ENGRAVING. 55 print made from it would be formed of a similarnetwork of solid lines. The resulting- etchingwould, therefore, give proofs gray and devoid ofcontrasts. If, on the contrary, a large aperture isused, the high lig-hts…
Photoengraving · Color photography
Internet Archive · Getty Research Institute · Public Domain Mark 1.0. Free to use for anything.
