US2387754A - Material for the production of partial color selection pictures from subtractive multicolor images - Google Patents

Material for the production of partial color selection pictures from subtractive multicolor images Download PDF

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US2387754A
US2387754A US333429A US33342940A US2387754A US 2387754 A US2387754 A US 2387754A US 333429 A US333429 A US 333429A US 33342940 A US33342940 A US 33342940A US 2387754 A US2387754 A US 2387754A
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image
printing
layer
blue
light
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US333429A
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Gaspar Bela
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Chromogen Inc
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Chromogen Inc
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Priority to US132611A priority Critical patent/US2340656A/en
Priority claimed from US132611A external-priority patent/US2340656A/en
Priority to GB8649/37A priority patent/GB494341A/en
Priority to FR822419D priority patent/FR822419A/fr
Priority to CH207532D priority patent/CH207532A/de
Application filed by Chromogen Inc filed Critical Chromogen Inc
Priority to US333429A priority patent/US2387754A/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
    • G03C7/28—Silver dye bleach processes; Materials therefor; Preparing or processing such materials
    • 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
    • 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

  • Such a multicolor image contains colored monochromatic partial. images covering and completing each other subtractively to a colored image. 'I'he necessity of producing the individual partial selections of such multicolored images arises in various circumstances. For instance, the multicolor image may have been obtained directly in the cameraand the individual partial selections may berequired in order to serve as intermediary elements for the printingprocess. In other cases, it might be necessary to reobtain from a multicolor print, such as a transparent multicolor cinema. print, the Various ⁇ individual color selection images out of which the multicolor print has been produced.
  • the individual partial color selections of a multicolor image may be obtained by printing with a printing light which is absorbed by the color of the desired partial selection picture and by using as printing material a layer which is sensitive to this particular light.
  • the three partial selections are thus produced by way of three printing steps.
  • the print is bound to be incorrect if the printing light, even though originally of uniform intensity, is subarises if an image of diiferent color must be traversed by the printing light as most colQrS4 have the quality of absorbing to a certain extent even the light-which they ought to transmit. For instance, a purple-red dyestuif diminishes the intensity of blue printing light although it theoretically ought to transmit this light without diminution. A blue-green dyestui which ought to be transmittant for blue and green is in reality attitude towards red light, which is almost completely transmitted by them.
  • the blue light for example, which is to be used for the printing of a yellow master-image does not penetrate to the printing layer with uniform intensity if it pre-v viously is led through a layer lying in front and containing a blue-green or a purple-red dyestuii in an image-like distribution.
  • a colored image lying behind the colored master-image has the same eiect, as in this case a certain portion of the light ⁇ which is Ato fall on the printing layer image on the printing material is made im- V possible.
  • the described image-like diminution in intensity of the printing f light is supplemented by an equal diminution of intensity graduated in the opposite sense. That is to say, if blue printing light, used in printing for example the desired-yeliow part image, as mentioned above, is to a certain extent undesirably diminished in intensity by a disturbing bluegreen image, the printing light is in addition intentionallyfiltered by a compensation-mask. 'Ihis mask is absorbent in those regions in winch the disturbing blue-green image is more or less transparent and therefore has not weakened the printing light, whereas it is transparent at those places at which the disturbingblue-green image exerts the most intense absorption.
  • the compensation mask has therefore the character-of a negative as compared with the blue-green image, if this image is assumed to be positive, and vice versa.
  • the compensation mask is of the same color as the image by which the intensityof the printing light is undesirably weakened, and in this case the distribution of color in the mask completes the image causing the undesirable e'ect to a homogeneously colored area, when both are superimposed.
  • the compensation mask may also be represented by a black and white image or an image in any lother color which to a certain extent absorbs the print- In case three-color images in blue-green, magenta and yellow are printed, a blue-green as well as a purple-red mask are used, first.
  • the bluegreen mask is employed alone, and thereafter both masks are employed together when printing the yellow image as described above. This procedure is to be recommended for the printing of multi-color images by successive use of dinerent printing lights on multi-layer material possessing several layers of dverent sensitivity.
  • the multi-color image Il! from which the single Ipart images are to be reobtained consists of a blank lm I i on which three colored letters A+, B+ and C+ appear as positives, B+ in purple-red, C+ in yellow, and A+ in blue-green.
  • the local diminution of the intensity of the printing light is completed to a uniform diminution of this light, whereby the correct printing of the partial images is made possible.
  • Another way of carrying out the idea of theY invention in practice is to make up for the undesirable deficit in the printing light by means of an additional illuminating of the print behind a compensation mask which represents a coloredl or black and white negative of the disturbing part image.
  • the intensity of the additional printing light at all points of the image must be equal to the diminution of intensity caused by the disturbing part images.
  • the compensation applied is adjusted in such a manner as to equalize, either by addition or subtraction, the disturbing absorption of light by the other partial images.
  • a multicolor image i shown in Fig. 1, .consisting of a purple-red colored Vpositive part image and a blue-green colored positive part image is used. From this a. negative 2 of the blue-green colored part image is produced by use of red printing light. This negative is dyed blue-green at the exposed points and is then imposed on the twocolor film which is to be printed. Thereafter, the purple-red partial image is printed by green light coming from light' source 3 through filter 6.
  • the negative A which has been produced previously is printed on it in faint contrast by use of the same green printing light with which the multicolor image has been printed.
  • the negative may be colored blue-green at the exposed points and may be printed in superposition with the multicolor image.
  • the print is then developed and fixed, thereby becoming a negative B- as shown at I5 of the purple-red colored partial image B+ contained in the original multicolor image.
  • the multicolor image l0 is printed on an ordinary photographic layer I8' in the ordinary manner. However, the layer is not developed, but first the negative A- and thereafter the negative B- are additionally printed on this layer. In doing so, the .intensity of the printing light is regulated in such a manner as to print the negative B- witha lower light intensity than the negative A, the latter, on the other hand, being printed with' a lower intensity than the original multicolor image. Thereafter, the print is developed and fixed, whereby a negative C- as shown at il of the yellow colored partial image C+ Vcontained in the Voriginal multicolor image is obtained.
  • the negative A corresponding to the blue-green partial image of the multicolor image, is mordanted and dyed red at the silver places, for instance by staining by means of a. basic red dyestui.
  • This negative is printed on to the printing layers used to produce negatives B- and C- with green or blue light insteadl of using the black and white negative A as heretofore described.
  • this red image may also be employed l, later for other purposes, for example, to print the partial image A- on a layer sensitive to green or blue.
  • the negative B- which may for instance be of a yellow, green or red color and may serve the same purposes as the black and white negative.
  • a positive A+ is produced. This positive A+ is used in further printing processes which require positive master images of the color selection pictures, for instance for processes in which a dyestui is produced at the non-exposed places of the print or in which a dyestui which was originally present is destroyed at the exposed places.
  • the master image A+ is printed on to the blue-green dyed layer by infra-red light, the master image B+ on ,the purple-red layer by -blue light, and the master image C+'on the yellow dyed layer by red light.
  • the lm is then developed.' iixe ⁇ d and treated by a 5% thiocarbamide solution containing also 21/r% citric acid. Thereafter it is bleached by a solution.
  • the image obtained after this treatment is a color-true reproduction' oftheoriginal multicolor image.
  • the positive lm 2l which is to be used for printing consists of three layers, i. e. a blue-green colored and blue-sensitive emulsion on one side of the support and a yellow-colored red-sensitive emulsion on the other side of the support. the latter layer being covered byl a purple-red colored and blue-sensitive emulsion.
  • the images I8. I 9. and 20 are printed on this material from both sides by use of blue light for the outside lavers andthe middle layer is simultaneously printed on by way of red light traversing the purple-red layer. After the silver-image has been produced. the dyestuil is destroyed at the silver places.
  • must be positive images of the three partial selections and may be three mas/ter images in col-o ors complementary to the sensitivity of the layers in which they are to be printed.
  • the two images which are to be printed on the two exterior blue-sensitive layers, are .colored yellow, whereas the image which is to be printed on the middle layer is of a blue-green color.
  • three individual layers are employed, i. e. a yellow-dyed red-sensitive one I2,v a yellow-dyed
  • the master images used for printing on the material green-sensitive one Il and a blue-green dyed layer It sensitive to green andblue.
  • the two yellow layers may be sensitized for both green and red, in which case it is possible to carry out the following process by use of only two diierent printing materials.
  • the multicolor image is printed on the yellow-colored red-sensitive printing layer I2 by red light, whereupon the print is developed and fixed in the usual manner.
  • 'I'his lm'then shows a black silver image on the yellow colored material and is transparent (i. e. yellow) at those places4 corresponding to the blue-green partial selection image of the multicolor image as shown at I3.
  • the multicolor image is printed on the yellow colored green-sensitive iilm Il by green light, and in addition, the black silver image I3 previously produced, is also printed on the same material Il by the same light.
  • 'I'his print is then developed and fixed and thereupon shows a black silver image on a yellow background as shown at i5, on which those places which correspond to the purple-red partial selection of the multicolor image I are transparent (i. e. yellow).
  • the multicolor image is then printed by blue light on the blue-green dyed layer I6 which is sensitive to blue and green.
  • blue-green dyed layer I6 which is sensitive to blue and green.
  • the negative silver images I3 and I5 previously obtained are printed on the same blue-green dyed layer I6 by use of green light. 'I'his illm is then developed and iixed. A black silver image is obtained as shown at I1, which is transparent (bluegreen) at those places corresponding to the yellow partial selection o! the multicolor image.
  • the three silver images I3; I5 and I1 produced in this manner on the two yellqw illms and the blue-green nlm are thereupon treated withr a dyestuH-destroying solution, e. g. with a thiocarbamide solution containing in addition 21/2% citric acid, and converted in the usual man ner into dyestufi images.
  • a dyestuH-destroying solution e. g. with a thiocarbamide solution containing in addition 21/2% citric acid
  • the positive intermediary master images 4shown at I8, I9 and 20 are obtained from which the yellow images are then printed on the multilayer material Ii by blue light and the blue-green with red v light in the manner described above.
  • the multicolor image of which individual partial selections .are to be produced contains positive partial images in blue-green and yellow colors, of which the yellow image represents the red selection of the photographic object and the blue-green image the green selection of this object.
  • Such multicolor images may be obtained by photographing with a bipack, the front film of which is not colored and is sensitive to blue, whereas the back iilm bears two superimposed layers, one dyed yellow and sensitive to red and the other dyed blue-green and sensitive to green, and thereafter locally destroying the dyestuff at the exposed places after exposure'and development. After separation of the bipack, the front nlm is developed separately to a negative or to a positive. By use of red printing light the blue-green parts of the rear nlm of 'the bipack appear yellow.
  • These master images may be printed on the two exterior layers oi the three-layer material 2l in the same manner as explained in the previous example, the yellow colored image (green selection) being printed on the purple-red layer, the purple-red colored image (red selection) on the blue-green layer of the multilayer material, the latter layer in this case having rto be sensitive not only to blue but also to green.
  • the blue selection produced on the colorless front lm is printed from a positive master image on to the middle layer of the positive three-layer lm by means oi red light.
  • the bluegreen layer of the positive nlm is not to be made sensitive to green, and if it is desired to use a completely identical positive material, as shown at 2l, a colorless panchromatic orred and blue sensitive lm is used for the master image of the yellow colored partial image, instead of a purplered colored layer.
  • the two-color image produced on the back lm oi the bi-pack is printed on this material by use of blue printing light, whereupon the black and white image oi the blue-green partial image, ⁇ produced on the yellow master image is additionally printed on the same material by red light.
  • This negative master image 'must then be transformed into a positive and is printed by blue light on the blue-green layer of the three-layer material.
  • the negative may also be dyed by a yellow dyestui after producing the silver images in the layer and converted directly into a yellow positive by treatment with above-mentioned thiocarbamidesolution,
  • V'I'his yellow positive is then printed on the blueireen layer of the three-layer material by blue Sht.
  • the silver image originally produced by printing into the colored layer served as a compensation mask and thereafter was used for the destruction of the dyestui! at the points where silver is present thereby lproducing from the mask a reversed dyestui! image constituting the required master image.
  • a silver 4image originally produced by printing into ordinary colorless layers may also serve as a compensation mask and thereafter be transformed into a. reversed image, constituting the requiredV -master image.
  • the unexposed silver halide is allowed to remain in the image during its use as a' compensation mask and the reversed image is produced afterwards by dissolving the silver image and developing the silver halide to form the master image.
  • the image formed by dyestuil' A in the multicolor image to be printed will yield at those places where neither the dyestuf! A nor the dyestuff B are present a maximal blackening Sw of the printing material.
  • Sm is determined by the intensity of the printing light and the a two-color image consisting of a yellow colored partial image and a blue-green colored partial image, the two-color image is first printed with red light on a lm sensitized to red or panchro- En B A21, 1l/, in which expression A /:r, y/ represents the absorption produced by dyestuil' A at the point at, y: B /a:, y/ represents the absorption at the same point of the image by dyestui B-of the printing light used for printing partial image B.
  • BB represents the ratio between the absorption of dyestu B in the printing light used for printing the partial image dyed by dyestui A and the greater absorption of this dyestui B in the printing light used for printing the partial image dyed by. dyestufl B. correspondingly, the intensity ofthe print of the partial image dyedby dyestui B produced by the printing light which is intensively absorbed by B is represented by the symbol B /a:, y/-lTEAA /a:,
  • the other serves as receptor of the compensation image which is to supplement the print of the desired selection in such a manner, as to compensate the errors produced in thecourse of the printing process.
  • the latter layer that is to ⁇ say, the layer used for printing'the coni-4 pensative image, diners from the layern on which the selection'itself is printed in'color sensitivity', in contents of silver, in gradation, 'or vin .coloring or in more than one of these properties-or
  • the l ers In order to produce on separate supports the l ers, one of which is of a diierent composition matically sensitized, whereby a print of the bluegreen colored part image of the multicolor image is obtained. It thelatter was a positive, the intermediate print obtained will be a negative.
  • the multicolor image is printed with blue light on a two-layer intermediate printing A material.
  • This two-layer printing material may be composed in various ways, several o! the possibilities of composition being illustrated in the attached drawings.
  • the intermediate printing material may be made up as illustrated in Fig. 3,' of two blue-sensitive layers, one
  • each side of the support being as thin as technically possible.
  • This support is dyed intensely yellow, so that it is non-transmittant for blue rays striking the material from either of the two sides.
  • Another possibility is to separate the two blue-sensitive emulsions, as is illustrated in Fig. 4 by coating the support lwith a gelatine layer dyed yellow by admixture of 2 gr. of' tartrazine per sq. metre ofthe surface. This coat-4 ing must be decolorizable by washing.
  • the previously produced negative selection of the blue-green partial image of the multicolor image is laid layer against layeron the yellow which can be done separately on each side of the intermediate printing illm a correct negative re,- ⁇ production of the yellow partial image contained' dyed emulsion. that is to say'on the emulsion producin'g the prints of softer contrast. It is then printed with blue light., In this way a latent positive image oflow contrast of the blue-green VPartial image of the two color image is obtained.
  • a machine equipped in this manner should likewise -be employed in producing intermediate prints on the one-layer printing material.
  • the individual part-images may be printed into each other in exact register and also exact register of the image which is to 1 .blue-green color.
  • colorless s upports which is to be corrected with the corrective image on one and the same printing lm is the simplification of the further procedure, as in this manner both images may be developed at the same time, so that the desired differences in contrast are produced automatically, provided that the layers of the intermediate printing material ,are balanced against each other accordingly,
  • the color selection images printed on the intermediate printing material may be employed in any way whatsoever, either directly or indirectly, for producing multicolor prints. However, attention must be paid to the fact that the presence of the yellow color in the .two-layer intermediate printing material in accordance with Figs. 3 and 4 excludes .the employment of blue light in the further treatment of the material. In, other the other side of the material.
  • the yellow color must either ilrst be' rel moved or the illm must be printed by use of green or red printing light.
  • VThe described example, in which the incorrect print of the partial image in question, as well as the image serving as corrective image, are printed on the multilayer intermediate printing material as black and white images represents the simplest form of application ofthe use of multilayer material for producing corrected selection pictures. It is for instance possible according to the invention to produce either the print of the image which is to be corrected or the partial image serving as corrective image or both of these prints as colored prints.
  • the silver image produced in the yellow ⁇ dyed layer of the two layer intermediate printing material may be converted into a yellow dyestuif image by destruction of the dyestu present; If the dyestufl destroying agent, for instance an acid solution of thiocarbamide in accordance with U. S.
  • Patent 2,020,775 issued October 30, 1931 acts at those places of A.the image where silver is present and therefore produces a reversed image of the partial color selection printed as a. corrective image, then instead cf using a negative of the blue-green partial image contained in the original to print on the yellow side of the two-layer intermediatey printing material (i. e. the side producing prints of soft contrast), as described above, one must use a positive of this blue-green partial image whereupon one will obtain a. colored positive on this side.
  • the compensated intermediate print produced in this manner shows, after destruction of the dyestu and removal of any silver, which might still be present in the layer containing the dyestuff image, the desired negative partial selection in the form of a silver image on one side and a positive dyestui image serving as a. cor-f rection of this print on the other.4
  • An intermediate print of this kind corrected by a dyestu compensation picture is printed by use of light is absorbed by the dyestuiI to a printing light of for which the respective dyestutt is more or less non-transmittant,. for instance blue light is used in the case of a yellow dyestui! image, and green light in the case of a red dyestui! image.
  • An intermediate print corrected by a yellow dyestufl compensation image and representing the red selection of the original object may be printed directly onto a blue-sensitive layer of are used, or if yellow iilter-layers are employed, these must be decolorized before the printing is performed.
  • positive intermediate prints are produced from the negative intermediate prints obtained.
  • an intermediate print consisting of blackv and white images or preferably intermediate images produced on the multilayer material described above in -which the corrective imageis represented by a dyestuil picture may be used.
  • it i possible to regulate the contrast or the correct coyerage of the corrective image with the image to be corrected once more by choosing a printing light which is absorbed by the color of the corretive dYeStuf-f image to the extent desired.
  • a second regulation of the contrast may be obtained by printing the silver image contained in the two-layer intermediate printing .material for a longer time than the dyestuii' image present on For example by switching over from a printing light color which a color which isA transmitted lby the dyestui in question, the printing effect of the dyestuif image is stopped after a predetermined time. This method is applied in case the corrective image is too intensely colored and the basic negative is to be accentuated in comparison to the latter.
  • the twolayer intermediate printing material described may be used for the further intermediate prints and all of the individual partial selections may iirst be printed on ordinary printing material without employment of the correcting images, these images being employed when the iinal intermediate prints are produced on the multi-layer material described.
  • a three-color film bearing blue-green partial vimages on one side of the support and purple and yellow images on the other side is to be printed on a multi-layer material, as shown at 2l and 22 in Fig. 2, the outside layers of which are magenta and blue-green and are sensitive to blue, Whereas ⁇ the middle layer is yellow and sensitive to red.
  • the image is to be produced by destruction of the dyestuff by the aid of thiocarbamide at the places at which silver is present.
  • First the printing is performed successively with red, green and blue light onto three layers, each of which'is sensitive respectively to red, green or blue light and is coated on a separate support.
  • the lm on which a .print is to be produced with red light is arranged layer against layer on the blue-green side of the multicolor image, and the films' on which printing is to be performed with green and blue light are laid layer against layer on the purple-red side of the master image.
  • 'I'he negative intermediate print produced mediate prints of the two negative intermediate prints produced with green and blu/e light
  • a twolayer lm as shown in Fig. 6 is used as a printing material
  • the support is coated with a silver.
  • a second coating consisting of a plain silver halide emulsion containing a normal silver content and sensitive to blue.
  • the negative produced by green light' is printed on the material shown in Fig. 6 by blue light, the two lms being arranged layer against layer whereby a latent image is obtained in the upper layer which is however not correct.
  • a previously produced negative corresponding to the bluegreen partial image of the original is laid upon the two-layer intermediate printing material, the support of the negative being placed directly on the upper layer of the two-layer material, and is printed into the lower layer by use of green light. Thereby a latent positive image is obtained in the green layer.
  • the nlm is developed and xed in the usual manner and is then bathed in a solution of thiocarbamide.
  • the dyestuif in the lower layer is destroyed and the silver is dissolved.
  • the silver image is only slightly affected. In the upper layer therefore a positive black silver image remains,-
  • the intermediate print for the third partial image is produced in exactly the same manner as has been described above.
  • This intermediate print is laid layer against layer on to the purple side of ythe iinal three-layer printing material and is printed with red light, the final print being produced in the yellow layer 0f the material.
  • red light the final print being produced in the yellow layer 0f the material.
  • Athe corrective image may be produced asa silverimage of low contrast instead of as a dyestuif image, if, instead of the negative image corresponding to the blue-green partial color selection of the original, the positive produced from this negative is printed into the material, in which case, however, the printing is performed by laying the positive layer against layer on to the intermediate printing material. 'I'he contrast of colorl intensity on the image may be regulated by ad- J'usting the printing light used accordingly. If a corrective image showing a hard.
  • the' method employed may deviate in various ways from the manner of procedure laid down in above examples.
  • rst produced is not directly printed are indicated in Figs. 'l and 8.
  • the material represented by Fig. 8 comprises two supplementary layers, both lof which contain only small pro-A portions of silver, these proportions diering from each other. This material is to be recommended if it is necessary to produce more than one corrective image and if the corrective images produced are to show diierent degrees of contrast.
  • this material in addition to the print of normal contrast, two further corrective prints of weak contrast are obtained in the two supplementary layers.
  • the corrective layers are produced or developed in such a manner that the gamma infinite of the layer intended for the corrective image is at the most half the value of the gamma infinite of the other layer.
  • emulsion particles of diii'erent sensitivity, coloring or contrast may be mixed with each other and coated on the support 'as a singleA layer.
  • the intermediate printing material may be composed by combining an ordinary emulsion optical printing method may be employed in all Y of the processes.
  • the correcting. image has a maximal density' which is as many times lower than the maximal density of the image to be corrected as the absorption of the disturbing dyestui in the printing light used for printing the desired image is lower than the absorption of the dyestuff forming the desired image.
  • the gamma ofthe correcting image and the gamma of the image to be corrected are in the same proportion to each other as the maximum absorptions ofthe disturbing dyestufl! in the image and the dyestuil' of the part image of the multicolor image to be printed.
  • Y i A multi-layer photographic material comprising two light sensitive silver halide emulsion layers coated on a support, one of. said layers being sensitive to green and dyed by a dyestui! which transmits green light yand absorbs red and blue light, said dyestuif ⁇ being i'ast to ordinary photoi 4 3.
  • a photographic film for making color sepao ration negatives comprising two colorless layers one of which is a negative photographic emulsion sensitive to light in one spectral region, andthe other of which is a direct positive photographic emulsion sensitive to light in another spectral region.
  • a multilayer' photographic material comprising a plurality of superposed light sensitive layers on a single support, said layers being. formed by silver halide emulsions sensitized for light of different spectral regions and differing in contrast, one of said two layers being adapted to record a desired color selection picture having un' desired absorption at various points thereof and 55 the'other being adapted to record a compensationl -solutions but capable of being locally destroyed with the aid of a metallic silver image, said two emulsion layers having substantially different ccntrasts, the relationship between said contrasts beins a function of the ratio between said undesired absorption the balancing absorption necessary in said compensation image, and one of said v layers being an ordinary photographic emulsion Land the other being an emulsion directly producing positives by simple development.
  • A'master image for color photographic printing purposes comprising a' transparent support carrying a colloid layer containing a silver image and a colloid layer containing a dyestui! image,
  • a photographic material comprising a plurality of light sensitive emulsions on a single support, at least two of said emulsions being silver halide emulsions sensitized for lightof diiierent spectral regions, one oi' said two emulsions being adapted to record a desired color selection picture having 'undesired absorption at various points thereof and the other being' adapted to record a compensation image in register with said desired color selection picture for balancing said undesired absorption, and oneoi' said two emulsions being dyed with adyewhich is fast to ordinary photographic treating solutions but capable of being locally destroyed with the aid of a metallic silver image, said two emulsions having substantially dierent contrasts and the relatiombetween said contrasts being a function of the ratio between said undesired absorption and the balancing absorption necessary in said compensation image.
  • a photographic material comprising aplurality of light sensitive' layers on a single support, at least two of said layers being silver halide emulsion layers sensitized for light of dierent spectral image in register with said desired color selection ⁇ picture for balancing said undesired absorption, one of said layers being a silver halide emulsion oi' normal silver content and another of said layers being a silver halide emulsion layer of reduced silver content, at leastl one of said last mentioned emulsion layers being dyed with a dye which is fast to ordinary photographic treating solutions 00 with the aid of a metallic silver image, said two layers having substantially different contrasts and but capable of being locally destroyed with the aid of a metallic silver image the relation of the silver content in said layers being a function of the ratio between saidundesired absorption and the balancing absorption ,necessary in said compensation image.
  • a multilayer photographic material comprising a plurality of superpcsed light sensitive layers on a single support, at least two of said layers being silver halide emulsion layers sensitized for 70, light of diner-ent spectral regions, one of said two layers being adapted to record a desired color selection picture having undesired absorption at various points thereof and the other being adapted sensitized for light ot different spectrarregions, 7o to record a compensation image in register with ass'mss f l 9 said desired color selection picture tor balancing said undesired absorption, and one ot said two layers being dyed with a dye which transmits 'green iight but absorbs blue light.
  • said dye heinz fast to ordinary photographic treating solutions but capable of being locally destroyed with tbe aid of ametaliic silver image. and aseeond one 'of said two layers being positioned in front oi said green sensitive layer and beingoolorless and sensitive to blue, said two layers having substantially diierent contrasts and the relation between said contrasts being a function of the ratio between said undesired absorption and thev balancing absorption necessary in said compensating im- BELA GASPAR.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Printing Methods (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US333429A 1936-03-24 1940-05-04 Material for the production of partial color selection pictures from subtractive multicolor images Expired - Lifetime US2387754A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US132611A US2340656A (en) 1936-03-24 1937-03-23 Process for the production of partial color selection pictures out of subtractive multicolor images
GB8649/37A GB494341A (en) 1936-03-24 1937-03-24 Process for the production of partial colour selection pictures out of subtractive multi-colour images
FR822419D FR822419A (fr) 1936-03-24 1937-03-24 Procédé pour la fabrication d'images partielles de sélection de couleur
CH207532D CH207532A (de) 1936-03-24 1937-03-24 Verfahren zur Herstellung von farbigen Kopien aus subtraktiven Mehrfarbenbildern.
US333429A US2387754A (en) 1936-03-24 1940-05-04 Material for the production of partial color selection pictures from subtractive multicolor images

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE207532X 1936-03-24
US132611A US2340656A (en) 1936-03-24 1937-03-23 Process for the production of partial color selection pictures out of subtractive multicolor images
US333429A US2387754A (en) 1936-03-24 1940-05-04 Material for the production of partial color selection pictures from subtractive multicolor images

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US2387754A true US2387754A (en) 1945-10-30

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Application Number Title Priority Date Filing Date
US333429A Expired - Lifetime US2387754A (en) 1936-03-24 1940-05-04 Material for the production of partial color selection pictures from subtractive multicolor images

Country Status (4)

Country Link
US (1) US2387754A (de)
CH (1) CH207532A (de)
FR (1) FR822419A (de)
GB (1) GB494341A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158477A (en) * 1959-04-02 1964-11-24 Motion Picture Res Council Inc Composite color photography
US4197123A (en) * 1977-07-21 1980-04-08 Ciba-Geigy Ag Process for the production of masked positive color images by the silver dye bleach process
FR2619228A1 (fr) * 1987-08-05 1989-02-10 Doi Kk Procede pour la production d'une epreuve couleurs de haute qualite et de longue duree de vie, presentant une longue conservation.

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2420636A (en) * 1942-04-11 1947-05-13 Eastman Kodak Co Photographic masking

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3158477A (en) * 1959-04-02 1964-11-24 Motion Picture Res Council Inc Composite color photography
US4197123A (en) * 1977-07-21 1980-04-08 Ciba-Geigy Ag Process for the production of masked positive color images by the silver dye bleach process
FR2619228A1 (fr) * 1987-08-05 1989-02-10 Doi Kk Procede pour la production d'une epreuve couleurs de haute qualite et de longue duree de vie, presentant une longue conservation.

Also Published As

Publication number Publication date
CH207532A (de) 1939-11-15
GB494341A (en) 1938-10-24
FR822419A (fr) 1937-12-30

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