US2158951A - Process for selecting single colors or color tones from pictures comprising several colors or color tones, especially for reproduction purposes - Google Patents

Process for selecting single colors or color tones from pictures comprising several colors or color tones, especially for reproduction purposes Download PDF

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Publication number
US2158951A
US2158951A US66758A US6675836A US2158951A US 2158951 A US2158951 A US 2158951A US 66758 A US66758 A US 66758A US 6675836 A US6675836 A US 6675836A US 2158951 A US2158951 A US 2158951A
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United States
Prior art keywords
colors
color tones
color
reproduction
exposure
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Expired - Lifetime
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US66758A
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English (en)
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Szigeti Ladislaus
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Individual
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Individual
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F3/00—Colour separation; Correction of tonal value
    • G03F3/04—Colour separation; Correction of tonal value by photographic means

Definitions

  • Fig. 1 of the annexed drawing shows the original so pattern to be reproduced and Figs. 2 to 4 represent n the individual reproductions which correspond to the steps required for selecting a color tone in'accordance with the invention.
  • Fig. 5 is a distorted cross section, of the reproduction according to 35 Fig- 2-
  • the original pattern to be reproduced is usually I an ornamental one, however, for the sake of simplicity in Fig. 1 a pattern consisting of flvestrips of different color tones marked by running numo bers has been shown as the original pattern.
  • the negative according to Fig. 2 is produced "by means of a suitable exposure or lighting through'and development with or without a color filter and eventually after interposing 'an'other layer.
  • This negative is produced in such a way 60 that the color tone ⁇ to be.sclected isgiving a light gray image:on the negative, that is the sensitive layer of the plate is altered along the strip 3' in such a manner that on the outer limiting surface of the layer a thin protecting or covll ering layer 6 is produced (Fig. 5), however, the
  • the reproduction according to Fig. 4 is obother parts of the layer or hardly changed. Namely, the sensitive layer is decomposed by the light before all at the spots where it is falling first to the said layer and by thisa protecting layer is produced. Thus by properly setting the exposure it may be attained that the reproduction 3" of the. color tone 3 to be selected is forming a transition between white and black, which is concolor tones 4 and 5 will become so dark that the chemical transformation is produced in the whole thickness of the layer or at least in its predominating part,
  • the second exposure must be a "suitable one, and since the protecting layer B is not opaque, but only partially obstructs passage of light rays, it will be understood that the intensity of the second exposure: must be so chosen as to be strong enough for darkening the parts I and I", but not :so strong that the light rays will penetrate underneath the covering layer 6. Of course, if the intensity of the second exposure is too great, that is to say the plate is exposed to light for too long a period, the light rays penetrate through layer 8 and strip 3' will be as darkas strips l' and 2'.
  • the principle of double exposure and double development is also adapted for coloring the images, as if at both exposures differently colored images are produced, a two-colored reproduction may be obtained.
  • the exposure may be done through any figure (design) ,for instance through a reticulation, by which further color effects can be attained.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Printing Methods (AREA)
US66758A 1935-03-01 1936-03-02 Process for selecting single colors or color tones from pictures comprising several colors or color tones, especially for reproduction purposes Expired - Lifetime US2158951A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
HU471360X 1935-03-01

Publications (1)

Publication Number Publication Date
US2158951A true US2158951A (en) 1939-05-16

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ID=10979275

Family Applications (1)

Application Number Title Priority Date Filing Date
US66758A Expired - Lifetime US2158951A (en) 1935-03-01 1936-03-02 Process for selecting single colors or color tones from pictures comprising several colors or color tones, especially for reproduction purposes

Country Status (4)

Country Link
US (1) US2158951A (de)
DE (1) DE686137C (de)
FR (1) FR802509A (de)
GB (1) GB471360A (de)

Also Published As

Publication number Publication date
FR802509A (fr) 1936-09-07
GB471360A (en) 1937-09-02
DE686137C (de) 1940-01-04

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