US3252795A - Color correction during the photographic reproduction of a color image - Google Patents

Color correction during the photographic reproduction of a color image Download PDF

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Publication number
US3252795A
US3252795A US325631A US32563163A US3252795A US 3252795 A US3252795 A US 3252795A US 325631 A US325631 A US 325631A US 32563163 A US32563163 A US 32563163A US 3252795 A US3252795 A US 3252795A
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United States
Prior art keywords
color
reproduction
sensitive
mask
coupler
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Expired - Lifetime
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US325631A
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English (en)
Inventor
Ramaix Maurice Antoine De
Danckaert Valere Frans
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Gevaert Photo Producten NV
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Gevaert Photo Producten NV
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/30—Colour processes using colour-coupling substances; Materials therefor; Preparing or processing such materials
    • A—HUMAN NECESSITIES
    • A63—SPORTS; GAMES; AMUSEMENTS
    • A63C—SKATES; SKIS; ROLLER SKATES; DESIGN OR LAYOUT OF COURTS, RINKS OR THE LIKE
    • A63C11/00—Accessories for skiing or snowboarding
    • A63C11/22—Ski-sticks
    • A63C11/221—Ski-sticks telescopic, e.g. for varying the length or for damping shocks
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C7/00—Multicolour photographic processes or agents therefor; Regeneration of such processing agents; Photosensitive materials for multicolour processes
    • G03C7/18—Processes for the correction of the colour image in subtractive colour photography

Definitions

  • the present invention relates to a method of color correction in the reprod-uction of a color image by photographic and/or graphic means and to a photographic element for use therein; this application is .a continuationin-part of our prior copending application Serial No. 777,224, filed December 1, 1958, now abandoned.
  • the red-sensitive emulsion would contain either a color coupler for magenta or for blue, or a mixture of a color coupler for magenta and of a color coupler for cyan. It finally proposed to add color couplers for magenta and for cyan, respectively, to distinct layers.
  • the same concept and, in general, the same variations are described in U.S.P. 2,382,690.
  • the green-sensitive emulsion contains a color coupler for green and the red-sensitive emulsion a color coupler for blue, great difculties arise in finding good color couplers for blue and, above all, for green.
  • An alternative is to use, on the one hand, a mixture of color couplers for cyan and for yellow and, on the other hand, a mixture of color couplers for cyan and for magenta. But, since it is practically impossible in color development to have two different color couplers to react in one and the same emulsion at the same rate, one is thus compelled to make a material with four emulsion layers.
  • a multilayer masking element comprising a transparent support carrying thereon a silver halide emulsion vlayer optically sensitized to both red light and green light and containing a color coupler for cyan, a silver halide emulsion layer optically sensitized to green light and containing a color coupler for yellow, a blue-sensitive silver halide emulsion layer optically sensitized to red light and containing a color coupler for magenta and disposed remote from said support, and a yellow filter layer adjacent said ice blue and red-sensitive layer and separating the same from said two other layers.
  • the present invention thus mainly relates to a process for reproducing color images wherein for the photographic reproduction step the color image to be reproduced is exposed while in association with a composite mask image containing individual images corresponding, in effect, to the following: a yellow negative of the image to be reproduced obtained by means of exposure through a green filter, a magenta negative of that image obtained by means of consecutive exposures through a blue and a red filter, and a cyan negative image obtained by consecutive exposures through a green filter and a red filter.
  • EXAMPLE l A transparent support having its rear side provided with an antihalation layer is successively coated with the following layers:
  • An emulsion layer sensitive both to green and to red and containing a color coupler for cyan such as, for instance, 4-sulpho-1-hydroxynaphtho-(2)-octadecylamideg
  • An emulsion layer sensitive to green containing a color coupler for yellow such as, for instance, m-palmitoylamino-benzoylaceto-3,S-dicarboxyanilide;
  • a yellow filter layer which contains, for instance, colloidal silver
  • An emulsion layer sensitive both to blue and to red and containing a color coupler for magenta such as, for instance, l-p-sulphophenyl-3-octadecyl-pyrazolone-S.
  • This material is then used in the following Way: the image to be reproduced is printed on it, either by contact or in optical way.
  • the exposed material is then developed for 5 minutesat 21 C. in a color developer of, for instance, the following composition:
  • a bleach-fixing bath which can be composed, for instance of the following composition:
  • the color-correcting and contrast-reducing mask thus obtained can now be registered with the color image to be reproduced.
  • the registering of the mask and the original can be effected in the usual way, viz the emulsion layer of the mask is brought into contact either with the rear side or with the emulsion side of the color dipositive or color negative.
  • special means for registering the mask are provided it is also possible to use the masking material according to the invention in an enlarger or a reprocamera for masking purposes in certain circumstances e.g. on making separations from a multi-color original in reilex (for instance a painting); afterwards, the mask is put in the optical axis of the camera. From the combination thus obtained color separations for graphic purposes or prints upon a three color material (negative or reversal development) can be made in contact or in optical way.
  • EXAMPLE 2 In order to demonstrate the functional superiority of the present invention over t-he prior art method, a comparison was made between a mask element prepared as in Example l above and a mask element constructed as in FIG. 4 0f U.S. Patent 2,382,690 and consisting in order on a support of a red-sensitive emulsion layer containing a cyan coupler, a second red-sensitive emulsion layer containing a magenta coupler, and an exterior green-sensitive layer containing a yellow color coupler.
  • the couplers for cyan, magenta, and yellow, respectively, were the same in both elements and the formulation of the constituents as well as the processing procedures employed were carried out in as close to an identical manner as reasonably possible to give a faithful comparison
  • Each of the experimental masks so prepared was exposed with white light through a glass strip containing three color wedges in the three complementary colors magenta, cyan and yellow, the dyestuts of which are mixed physically in such a way as to give an absorption corresponding to that of the originals from which the separation negatives are made.
  • each mask element is registered with the glass strip and the registered color wedges are then measured behind a blue, green, and a red filter for absolute gamma-values.
  • the absolute gamma-values are adjusted to a common basis by converting the absolute values for the principal absorption of each dyestuff, e.g. green light absorption for the magenta dyestuf, blue light absorption for the yellow dyestuff, etc. to 100 and multiplying the absolute gamma-values for the sideabsorptions by the same conversion factor.
  • the resultant relative gamma-values for the two experimental masks, the prior art mask being identified as II and that of this invention as III are set forth in the following table together with the corresponding values desired in a theoretically ideal mask, identied as I.
  • a theoretically ideal mask is one giving good color reproduction, taking into consideration the average side-absorptions of the dyestus of the original to be reproduced and the average sideabsorptions of commercially available printing inks.
  • mask II shows considerable overcorrection, and mask III is Within the ideal limits
  • the two experimental masks give comparable correction except for blue and green light side-absorptions by the cyan dyestuff for which mask II provides considerable overcorrection, and for red light side-absorption by the magenta dyestuff for which mask II provides considerable undercorrection.
  • mask III exhibits subsantial superiority over mask II.
  • a multi-layer color photographic masking element for applying color correction during color reproduction comprising a transparent support carrying thereon:
  • a silver halide emulsion layer optically sensitized to both red light and green light and containing a color coupler for cyan
  • a color photographic masking element as in claim 1, wherein the color coupler for yellow is m-palmitoylaminobenzoylaceto-3,5-discarboxyanilide.
  • a color photographic masking element comprising on a transparent support the following layers in the stated order:

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
  • Light Sources And Details Of Projection-Printing Devices (AREA)
US325631A 1957-12-02 1963-11-22 Color correction during the photographic reproduction of a color image Expired - Lifetime US3252795A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEG23457A DE1058839B (de) 1957-12-02 1957-12-02 Verfahren zum Kopieren oder Reproduzieren von Farbenbildern mit Hilfe von Farbmasken

Publications (1)

Publication Number Publication Date
US3252795A true US3252795A (en) 1966-05-24

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US325631A Expired - Lifetime US3252795A (en) 1957-12-02 1963-11-22 Color correction during the photographic reproduction of a color image

Country Status (5)

Country Link
US (1) US3252795A (fr)
BE (2) BE566156A (fr)
DE (1) DE1058839B (fr)
FR (1) FR1208980A (fr)
GB (1) GB863340A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0251042A2 (fr) * 1986-06-28 1988-01-07 Agfa-Gevaert AG Matériau d'enregistrement photographique couleur
US5114837A (en) * 1988-11-09 1992-05-19 Fuji Photo Film Co., Ltd. Silver halide color photographic material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL247346A (fr) * 1959-01-14
DE2601377C2 (de) * 1976-01-15 1985-03-28 Agfa-Gevaert Ag, 5090 Leverkusen Verfahren zur Herstellung äußerer Rück- und Vorderseitenschichten auf photographischen Materialien

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB811311A (en) * 1954-08-20 1959-04-02 Agfa Ag Process for improving the colour reproduction in the reproduction of multi-colour images

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB811311A (en) * 1954-08-20 1959-04-02 Agfa Ag Process for improving the colour reproduction in the reproduction of multi-colour images

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0251042A2 (fr) * 1986-06-28 1988-01-07 Agfa-Gevaert AG Matériau d'enregistrement photographique couleur
US4770980A (en) * 1986-06-28 1988-09-13 Agfa-Gevaert Ag Multilayer color photographic recording material wherein a red secondary sensitivity is produced in the blue and green layers
EP0251042A3 (en) * 1986-06-28 1989-07-12 Agfa-Gevaert Ag Colour-photographic recording material
US5114837A (en) * 1988-11-09 1992-05-19 Fuji Photo Film Co., Ltd. Silver halide color photographic material

Also Published As

Publication number Publication date
DE1058839B (de) 1959-06-04
FR1208980A (fr) 1960-02-26
BE563174A (fr)
BE566156A (fr)
GB863340A (en) 1961-03-22

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