US2360213A - Photographic color correction process - Google Patents

Photographic color correction process Download PDF

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Publication number
US2360213A
US2360213A US428580A US42858042A US2360213A US 2360213 A US2360213 A US 2360213A US 428580 A US428580 A US 428580A US 42858042 A US42858042 A US 42858042A US 2360213 A US2360213 A US 2360213A
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layer
silver
image
layers
color
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US428580A
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English (en)
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Ralph M Evans
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Eastman Kodak Co
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Eastman Kodak Co
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Priority to FR956733D priority Critical patent/FR956733A/fr
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Priority to US428580A priority patent/US2360213A/en
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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
    • G03C7/18—Processes for the correction of the colour image in subtractive colour photography

Definitions

  • FIG. 1 is a diagrammatic representation of FIG.
  • PHOTOGRAPHIC COLOR CORRECTION PROCESS I Filed Jan. 28, 1942- 2 Sheets-Sheet 2 ATTORNEYS Patented Oct. 10, 1944 Fries PHOTOGRAPHIC COLOR CORRECTION PROCESS Ralph M. Evans, Rochester, N. 31., asslg-nor to Eastman Kodak Company, Rochester, N. Y., a
  • This invention relates to processes of subtractive color photography, and more particularly to color correction processes of subtractive color photography.
  • the object of the present invention is to provide a method of compensation for the adverse effect of an image in one layer of a subtractive color film, upon the formation of a colored image in an adjacent layer.
  • Fig. 2 shows the range of tones of several different colors in a colored original.
  • Fig. 3 is a representation, when the gray scale is balanced, of the theoretically desired gammas and the effective gammas of silver images in bleaching dyes in a film which has been exposed to the colored object of Fig. 2 and developed black-and-white.
  • Fig. 4. is a representation of the effective gammas of silver images, beforeand after balancing the gray scale, in bleachih dyes in a film which has been exposed to the colored object of Fig. 2 and developed black-and-white.
  • Fig. 5 is a representation of the method of the invention, showing the effect on the eiiective gammas of the silver images, before balancing the gray scale, of exposing through the top layer silver image and forming a secondary silver image in the middle layer and thereafter bleaching dyes in the region of all of the silver images.
  • the film shown in Fig. 1 may be composed of the materials and be sensitized, colored and processed, as described in Ehrenfried U. S. Patent 2,322,001, granted June 15, 1943, or Seymour U. S. Patent No. 2,231,685, granted February 11, 1941. That is, a support l0 may have coated thereon, in order, red, green, .and blue lighte sensitive emulsion layers, H, l2, and i3, colored with dyes roughly complementary to the ef- :fective sensitivity of the respective emulsion layers; layer H being colored cyan, layer i2 colored magenta, and layer l3 colored yellow. After exposure to an original having the colored images shown in Fig. 2, the film is de- 'apparance of the film after development.
  • the solid H and D curves represent the theoretically desired gammas of the silv'efimages in the different layers, produced by exposure of the film to light of the color shown in the squares of Fig. 2 directly above the. respective curves, followed-by development, which gammas in subsequent bleach-out treatment of the fllm 5 would efiect the correct amount of bleaching of the dyes to give a balanced gray scale.
  • the dotted H and D curves represent the observed effective gammas of the silver images in bleaching dyes, and these curves indicate that the gammas of the silver images in layers ii and ii are approximately those theoretically desired, whereas, in layer ii there appear effective gammas in areas corresponding to exposure with blue and magenta llghtfrom the colored object; the efl5 fective gammas corresponding to exposure with green and yellow lights of the object are .low. Accordingly, the efiect of bleaching dyes from the respective layers under influence of the effective silver gammas, is to place green over the blues and yellows, a darkening of the greens and a lightening of the magentas. These are typicaldefects in color-rendition with which my inven tion' is concerned, and which-may be attributed,
  • the dotted lines represent the respect that the density of the dye, or the thickness of the emulsion, in the middle layer is greater (shown in Fig.4 as an emulsion layer. of greater thickness) and expose the film to a colored object such as shown in Fig. 2.
  • silver images are developed in the respective emulsion layers using a suitable black-and-white developer. As explained above, I have reasoned that at this point the respective games of the silver images in the layers will have the characteristics shown by the solid H and D curves in Fig. 4.
  • the middle layer is given a partial exposure with The dot-dash lines show the overall effective gammas of all of the silver images for bleaching dyes in the middle layer, when the silver images in layers It and i1 effect the correct amount of bleaching in their respective layers.
  • my invention may be applied to the case where it is found that the silver image in the bottom layer is adversely effecting bleaching of the dye in the middlelayer. However, in this case the corrective exposure is made through the bottom la er silver image.
  • My process is also applicable to multilayer color films of the type having dyed emulsion layers sensitized to light of wave lengths transmit- .ted by the emulsion ayes.
  • a film having green, red and blue sensitive emulsion layers, colored respectively cyan, yellow and magenta, wherein the magenta layer is over the yellow layer and the cyan layer is below the yellow layer, and in which colored images are formed by the bleach-out process may be treated I by my method.
  • defects in color-rendition may be attributed to the influnce of themagenta layer silver image on the bleaching of dye in the adjacent yellow layer
  • the defects in color-rendition may be manifest by a bluing of the greens, darkening of'the blues, yellowing of the reds and a lightening of the yellows when the gray scale is balanced.
  • the middle layer is given a partial exposure through the top layer silver image and a secondaryimage is developed therein.
  • the dyes in the respective layers are bleached out under influence of silver images in them, by
  • the reason for using an increased amount'of magenta dye in the middle layer and developing a secondary image in the-layer, is now apparent from consideration of 5.
  • the' and i1 indicate the effective gammas of the silver images before the secondary image was deas disclosed in U. S. Patent'2,322,001, above cited.
  • the image of the aspect not involved may be printed and developed in the film subsequent to the supplementary exposure
  • My invention may also be applied to reversal processes -of subtractive color photography wherein colored images, are produced by means of color-forming development.
  • Typical films useful in such processes are those disclosed in Mannes and Godowsky U. S. Patent U. S. 2,252,718, granted August 19, 194-1, and Jelley and Vittum U. 5.
  • certain color-rendering defects are attributed to the effect of the silver image of first development in one layer, on thecolor-development of a colored image in an adjacent layer. Where the observed defect is of the same order as observed in the processes of the bleach-out type, the correction is applied in the same general manner as previously described,
  • the color corrected films corrected in the manner described in the invention, may be used as color transparencies for projection, viewing or the like, or these films may be used for printing other pictures in color. For instance, one may print the corrected films onto sensitive films of the same type and apply the color correction methods of my 1 ention for producing color balanced images the final copy. Similarly, in processes where it is desired to take separate aspects from a color film and later assemble colored images corresponding to these aspects, these aspects may be taken from color.
  • films corrected for deficiencies in absorption or transmission of subtractive dyes may be used in conjunction with than in the developer, any requirement of inin order upon a support, red, green and blue sensitive emulsion layers, in which are to be developed, respectively, cyan, magenta and yellow dye images.
  • red, green and blue sensitive emulsion layers in which are to be developed, respectively, cyan, magenta and yellow dye images.
  • the negative silver of the bottom layer has an adverse effect upon the development of a dyeimage in the middle layer, which corresponds, 'efiectively,
  • the adverse effect may also be compensated for by giving the bottom-layer a prolonged re versal exposure to red light after first development. which, due to slight sensitivity of the mid-. dle layer to red'fig'ht will impress a supplemenall layers by means of color-forming development.
  • red, green and blue sensitive silver halide emulsion layers colored cyan, magenta and yellow, respectively, wherein the emulsion layers are exposed, developed and the dyes should be removed only under influence of, and in the region of, silver images in the respective layers, but wherein a developed image in theexposed area 01 the yellow layer adversely aflects removal of dye in the magenta layer,
  • the method comprising exposing to a colored oblect, a fllm of the type described having an increased amount of magenta dye in the green sensitive emulsion layer, developing silver images therein, partially exposing the magenta layer with green light through the image in the yellow layer, said exposure being'just sufllcient to remove all of the increased amount of magenta dye in those regions of said magenta layer which underlieregions free of silver in said yellow layer, developing a second image in themagenta layer and then'removing the dyes underinfluence of the silver images in both layers.
  • the method comprising exposing to a col-- ored object, a film ofthe type described having an increased amount of dye in said adversely affected layer, developing silver images therein, partially exposing the unexposed area of said adversely affected layer through the image in said other layer, said exposure being just suflicient to remove all of the increased amount of dye in those regions of said adversely afiected layer which underlie regions free of silver in said one layer, developing a second image in said re-exposed layer and then removing the dyesunder influence of silver images in both layers.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US428580A 1942-01-28 1942-01-28 Photographic color correction process Expired - Lifetime US2360213A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
FR956733D FR956733A (enrdf_load_stackoverflow) 1942-01-28
US428580A US2360213A (en) 1942-01-28 1942-01-28 Photographic color correction process

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FR956733A (enrdf_load_stackoverflow) 1950-02-06

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