US2447687A - Process for obtaining multicolor pictures - Google Patents

Process for obtaining multicolor pictures Download PDF

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Publication number
US2447687A
US2447687A US571972A US57197245A US2447687A US 2447687 A US2447687 A US 2447687A US 571972 A US571972 A US 571972A US 57197245 A US57197245 A US 57197245A US 2447687 A US2447687 A US 2447687A
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image
images
negative
silver
positive
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US571972A
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Danlos Pierre
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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
    • G03C7/26—Silver halide emulsions for subtractive colour processes

Definitions

  • This invention relates to the color-plvlOtOgphy and particularly to the production 'oi iilmsfin two, three or four colors, from photographic films carrying different photographic silverA halide images, which are torbe found, either on the same level, or on different levels,lin a singlecoating, or alternatively in superposed diiverent coatings, on the same side, or onbothsides of a transparent support, said pictures being obtained by the well known process, which comprises ⁇ printing with positives, developing and removingv the negative silver images to obtain a composite positive silver halide image still sensitivevto'light action,
  • the principal o bject'of l the invention consists of a process, particularly characterized by the fact that the various silverV halide images'considered are diierentiated byan optical method, according to which said film is tobe submitted to one or more successive differential exposuresj by means of actinic excitations that may vary'irm one point to another, in such" a 'manner that, during each exposure, one oi the images' included in the iilm is wholly exposed to the eiect of light, while the others remain quite unaltered by said effect, said film being submitted, after eaclieX- posure, to a suitable treatment, the other images being subsequently, ⁇ in their turn, submitted 'to a suitable treatmentl
  • a particular embodiment 'of said"process conl sists of a method according to 'which 'a'differential isolation or exposure is vobtainedbymeans 'of a special element which shall be called di ier entiating unit and whichy
  • said lin comprises several images to bedifferentiated, either on the same side, orV on both sides of that iilm, several differentiating units will be used, each of which corresponds'to the image to be differentiated and constituted'as above explained, said units beingVv 'utilizedsuccessively.
  • the invention relates'equally to the different particular treatments to which said lmhasto be submitted, after each exposure', bymeans of a diierentiating unit, or vby any other means, said treatments being different according'torthe number ofY images and of colors which are to be practically.
  • said fdiferentiatingunits 4constituted as it has ybeen ⁇ pointed outabove and, on th'eother/hand,
  • Thecharacteristicfeatureof the process action'picturfs obtained by Iapplication of said f'crdingto the invention offers the 'advantage ,over ⁇ v the known differentiation "processes which operate either inacl'iemical way, "or'in a mechanochemical way, that it 'renders it 'possible'thei'use'of'common 'single silver halide emulsion iilr'ns in which thevarious images to be Idiiferentiated lie'on any level, even, on the same level'iri the emulsion itself [which was impossible with saidknown process, the latter'being applicable only if said' images lie on dierent levels'.
  • “thoseformer processes Vit Vit was necessary, in order specification. 1 n
  • the silver halide image thus formed is still sensitive'to' light fand its sensitivity, atany point, is a function of vthe 'concentration of th'e 'sensitive silver 'halide grains remainingat "the 'same ⁇ point; the Sresult is that 'such 'an' image may'be'developed with a of'said images A and B ⁇ at the same point.
  • the denominations brightness of the subject or concentration of sensitive grains will be used indifferently in order to'po'int out the sensitivity of the sensitive image, in whatt ever point of the subject.
  • the images to be differentiated being called respectively A'and B, and I the primitive'image which is the sum of said images A and B.
  • the former (image A) is to be differentiated ina state of rei **d silver, while the latter (image B) remains in a state of silver halide, still sensitive'ito light.
  • the quotient A/B becomes very great'atany point, it means that B is almost equal to( Zero at that point; consequently the transparency of the differentiating unit must A Ybeco'nrie very great in order to permit a total in 4solation to be applied to image A at the point in question.
  • the quotient A/B vbecomes/very small at any point it means that A becomes almost equal to zero, from which it results that thetransparency ofA the differentiating unitf at that point vmust be as low as possible, in order to prevent any action of light Von the image B at the point in question.
  • Said differentiating unit in the case of two images A and B may be formed by the superposition ofthe negative of the image A which is to be-exposed and ofthe positive of they other 'image atelythat a uniform exposure is n ot able to cause satisfactory results,A since thev two primitive imv vages are not identical. Consequently it is necessaryrto differentially expose the sensitive limy register.
  • interval a--b represents thewedge, or scale of Patoscurmprinted in A'and in-B, with the same exposure.
  • the interval c-c'-e represents two wedges, the one situated in A being put in a certainl direction and the other situated in B in the reverse direction, .which gives the possibility of obtaining every possible value ofthe quotient A/B.
  • the flux ⁇ Il irradiated from the light source has been represented.
  • the most intense density of the nega- "tive NApis denoted by d, said-.density being, as
  • d is the variable quantity of the system, 2d representing the maximum of ⁇ density, and that consequently there is a minimum value of d, above which said vproblem always. admits a solution.
  • Thelm, after exposure bymeans of the differentiating unit for instance, is submitted -to 4various treatments according toy its-constitution, according to the number of-images which it carries and nally according to the colors which are to be giventov the different-images, for instance, blue-green,magenta, yellow.
  • the Iilm in which the 'images A and B have been diierentiated, as described above, is washed and treated with asolution of potassium iodide which transforms'the silver halide constituting the image B-into iodidev of silver, ⁇ without practically acting onthe deposit ofreduced silver which constitutes the image A.
  • the image B is then dyed by immersing'the lm' in a solution of safranine and auramine, containing a suitable quantity of acetic acid-the excess of coloring matter is carried away by Washing, then silver iodide is eliminated in a 'hypo "fixing bath, after having taken care to-x the coloring*- lmatter on the gelatine of the emulsion by the help of a tanning bath.- It remains then to tone image A in blue-green, which is done by immersing said image in a ferrictoning bath.v IThe ferrocyanide of silver formed in the Atoningbath isthen eliminated and, afterwards, the iilm- 'must be Washed and dried.
  • the images B and C may then be treated by mordanting and dyed separately magenta and yellowfwhile A will be' treated' by the ferrocyanide toning bath, as described with" regard to the bichrome process.
  • images B and Bv will beftreated by mordantingand dyeing while images ⁇ A ⁇ and A will be treated by toning.
  • ⁇ image *corresponding to fthe' blue-green sensa- '-tion'- is' exposed, vfor instance,lby"me'ans of a "diierentiating ⁇ unit which comprises not y'only negative A and positive B, but alsoipositive C.
  • a second differentiating unit is :then' used
  • E rc'icessio'rv obtaining a 'threecolor picture a support coatedA with a single-silver halide emulsion, ⁇ which processcomprises printing into said vemulsion in ⁇ registered A"superposition with three positive part pictures in's'uchimanne as to produce a composite negative-image representing the three-'positivel part pic'tures, ⁇ l developing and *removing the' negative silver'image in orderl to l"obtain a composite 'positive-silver halide ⁇ image sensitiveimagel while in registerl with a 4'differentiating unit formed by the superimposition of the negative ofthe first componentpicture to be exposed and ofthe* twoipofs'itives of 'the second and nent picture into its elementary colored picture; dierentially exposing the said lm again while in regi-ster with a second diiTerentiatin-g unit formed by the superimposition of the negative of the second component picture to be exposed and of
  • Process for obtaining three color picture on a support bearing a silver halide coating on each side of the support comprises: printing in register into the coating on the rst side with first and second positive part pictures in such manner as to produce a composite negative image representing said first and second positive part pictures, and registering into the coating on the other side the third positive part picture, developing and removing the negative silver images in order to obtain on the first side a composite positive silver halide image sensitive to light; differentially exposing the said composite sensitive image while in register With a differentiating unit formed by the superimposition of the negative of the first component picture and of th'e positive of the second component picture, developing and transforming the said first component picture into its elementary -colored picture, transforming both second and third component pictures each into its elementary colored picture respectively.
  • Process for obtaining a three color picture on a support bearing a silver halide coating on each side of the support comprises: printing in register into the coating on the rst side with rst and second positive part pictures in such manner as to produce a composite negative image representing said rst and second positive part pictures, and registering into the coating on the other side the third positive part picture, developing and removing the negative silver images in order to obtain on the first side a composite positive silver halide image sensitive to light: differentially exposing the said composite sensitive image While in register with a differentiating unt formed by the superimposition of the negative of the first component picture and of the positive of the second component picture, developing the said first component picture, transforming both second and third component pictures each into its elementary colored picture respectively, finally turning the first component picture into its elementary colored picture.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)
US571972A 1943-12-20 1945-01-09 Process for obtaining multicolor pictures Expired - Lifetime US2447687A (en)

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FR486225 1943-12-20

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US2447687A true US2447687A (en) 1948-08-24

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US (1) US2447687A (en(2012))
BE (1) BE456898A (en(2012))
CH (1) CH263303A (en(2012))
NL (2) NL63693C (en(2012))

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE18680E (en) * 1921-09-09 1932-12-06 Leonard t
US2252718A (en) * 1937-11-19 1941-08-19 Eastman Kodak Co Reversal process of color photography
US2340656A (en) * 1936-03-24 1944-02-01 Chromogen Inc Process for the production of partial color selection pictures out of subtractive multicolor images

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE18680E (en) * 1921-09-09 1932-12-06 Leonard t
US2340656A (en) * 1936-03-24 1944-02-01 Chromogen Inc Process for the production of partial color selection pictures out of subtractive multicolor images
US2252718A (en) * 1937-11-19 1941-08-19 Eastman Kodak Co Reversal process of color photography

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NL119117B (en(2012))
CH263303A (fr) 1949-08-31
NL63693C (en(2012))
BE456898A (en(2012))

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