The history of three-color photography (1925)

Record Details:

Title:
The history of three-color photography
Date:
1925
Publisher:
Boston : American Photographic Publishing Company
Volume:
The history of three-color photography
Leaf #:
000570
Language:
English
Subjects:
Motion Pictures, Motion pictures--Technology
Collection:
Books
Format:
Books
Contributor:
Media History Digital Library
Sponsor:
Media History Digital Library
Coordinator:
Media History Digital Library
Description:
Date Added:
September 21, 2023
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554 History of Three-Color Photography the screen-plate used for the negative, a positive emulsion plate or film with the sensitive surface out, then to expose, develop and fix and destroy the negative. E. Pal33 proposed to use a screen-plate for positive work, in which the elements were red, yellow and blue. Fig. 146 shows his idea; A is the layer of elements and N the negative image, the elements a, b, c, being respectively orange-red, yellowish-green and violet. In / white is represented; in 77 an orange-red; in /// a yellowish-green; in IV blue-violet, X mw\ mm\\\\\ mmmmm\mmmmm& *%mfmmnf& SMM m Fig. 146. Pal's D.R.P. 251,623. and in V no light or black. The positive is P, and the figuring represents the same fields, but the elements a', b', c' are red, yellow and blue; B is the support. Under each of the fields of the negative there appears two red elements, or rather two halves a', a' and a yellow and blue element b', and c't therefore, white was formed. The best arrangement of the elements is shown in 2, and this had the advantage over lines or the usual checker board, and to attain this effect the screen was divided into parallel strips, and each strip into squares or parallelograms, which were colored