Classifications

• • 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
  • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
  • G03B27/00—Photographic printing apparatus
  • G03B27/72—Controlling or varying light intensity, spectral composition, or exposure time in photographic printing apparatus
• • 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
  • G03C1/00—Photosensitive materials
  • G03C1/76—Photosensitive materials characterised by the base or auxiliary layers
  • G03C1/825—Photosensitive materials characterised by the base or auxiliary layers characterised by antireflection means or visible-light filtering means, e.g. antihalation

Definitions

• This invention relates to a process for the production of colored photographic images having improved colors as well as to a photographic material for performing this process.
• the color separation records for a three-color reproduction are exposed with blue light (yellow separation record), green light (magenta separation record) and red light (cyan separation record); furthermore, masks for color reproduction are generally produced with colored light, usually with yellow or yellow-orange light. Colored light is also sometimes used in black-and-white reproduction, for example, in the reproduction of originals which have become yellowed, where a yellow or yellow-orange filter is to be used, or in the reproduction of colored toned images.
• the said color filter layer can be arranged on the back of the film support or also between the film support and light-sensitive layer. It is also possible for the film support itself to be suitably colored.
• the color layer is preferably capable of being decolorised automatically in the photographic baths, so that the processed image is colorless at. theclear areas. Dyestuffs which satisfy this United States Patent ice requirement are widely known and in fact in all possible colors from which further colors can then be produced by suitable mixing when required.
• the light-sensitive layer itself has a spectral sensitivity which extends at least through the transmission range of the colored filter layer, but preferably beyond said range.
• the mask -a light-sensitive material which, in accordance with the present invention, comprises a yellow or yellow-orange filter layer which is on that side of the support opposite to the emulsion layer and through which exposure is made in the production of the mask, a light source with unfiltered (white) light being used.
• the light-sensitive silver halide emulsion layer itself is sensitive for all parts of the visible spectrum, i.e. is panchromatic.
• the same material can also be used for the second process, where the masks must be produced with other light colorings.
• the production of the masks takes place in known manner, in that the material described is now exposed from the side of the lightsensitive layer and with the use of corresponding color filters.
• panchromatic masking film known per se and to be exposed with filters can be used universally by means of the invention without any modification being made in the processing step in the photographic bath.
• the present process is not limited to the example described. It can be used generally and in fact always when one and the same light-sensitive layer for one purpose in the reproduction art must be exposed with a certain type of light and for the other purpose with one or even several types of lightin the latter case, with different filters, while in the former case, the filter is even unnecessary if the layer has the corresponding spectral sensitivity.
• the invention can also be used on two or more layers which are arranged superimposed and are to be exposed simultaneously, as are known in the reproduction art or also in color photography.
• the light-sensitive layer can be either 'a so-called continuous tone layer (with a gradation below 3.5) or also a hard emulsion for line or screen exposures (gradation above 3.5), more especially an emulsion of the so-called lith-type.
• the silver halide it can also contain one or more color components, so that a pure color image or also a color silver image can be produced by the method of so-called chromogenic development.
• Such colored silver images can be used with advantage as masks.
• tanning relief images can be produced if the layer exposed according to the invention is developed with one of the known tanning developers.
• the filter layer can have a low color density or even ahigh color density and in the latter case it simultaneously acts as an anti-halation layer when the film is exposed from the emulsion side.
• the image produced according to the process can contain light-dispersing agents or can be provided with a surface matting, so that the images produced according to the process contain a certain degree of lack of sharpness, as is necessary for example with masking images for color correction.
• the light source used for the exposure can either emit white light, or it may also emit colored light for example mercury lamps.
• white light the spectral transmission of the colored layer have to be adjusted to the radiation of the light source to be used.
• Light-sensitive films which can be exposed through the support are certainly known in the reproduction art, and in some cases even those which comprise a colored layer in a weakly neutral color on the support. They are used for screening black-and-white half-tone originals. In this case, the exposure with light must not be effected with colored light of pie-determined spectral distribution, but for the highest possible utilisation of the sensitivity of the light-sensitive layer with white light of highest possible intensity, for which reason the coloring of the colored layer is neutral grey and of low density.
• Example A transparent support of acetyl cellulose having a thickness of 200 is coated with a colored antihalo layer.
• the antihalo dyestuffs have to be applied in such an amount that the dried antihalo layer shows the following color density: 2.0'for blue light, 1.0 for green light, and 0.35 for red light.
• the measuring of the color density is accomplished by interposing colored filters between the light source and the antihalo layer, e.g., color separation filter No. 352L (blue), No. 54L (green), No. 45L (red) of Agfa Aktiengesellschaft.
• colored filters e.g., color separation filter No. 352L (blue), No. 54L (green), No. 45L (red) of Agfa Aktiengesellschaft.
• the thickness of the dried antihalo layer is 8
• Numerous antihalo dyestuffs suitable for the process according to the invention are available. Yellow dyestuffs are described for example in the US. patent specification 2,03 6,546 in particular in the Examples 1-5, red dyestuflis in the British patent specification 900,094, and green dyestuffs in Ger-man patent specification 616,007. Suitable is further the dyestufl dysulphine green B (Schultz Farbstofi-Tabellen No. 767). Further dyestulis are disclosed in the British patent specifications 695,874, 633,114, 706,084, 680,631, 506,385, 584,482, 694,681. Onto this colored antihalo layer is cast a protecting layer of gelatin, having a thickness of approximately 11L.
• the other side of the support is coated with a light-sensitive silver halide gelatin emulsion described in FIAT Final Report No. 360, page 28 which before casting has been diluted with a 7% aqueous gelatin solution in a proportion of 1:1.
• the light sensitive layer having a thickness of 6.5; was panchromatically sensitized by the addition of suitable sensitizers. Again at protecting layer was applied on to the light-sensitive emulsion layer.
• the light-sensitive photographic material described above is processed as ltollows:
• the photographic material is exposed through a multi-color transparency being in The casting solution consists of a 7% aqueous solucontact with the colored antihalo layer of that material. Accordingly the light-sensitive layer is remote from the light sources.
• the exposure was accomplished by the aid of an incandescent lamp having a color temperature of 2850 K.
• the exposed photographic material is developed in a common black-and-white developer until a gradation of 0.50 is obtained.
• the developer has the following composition:
• the developed photographic material was rinsed, fixed in an acid fixing bath, rinsed again and dried.
• the resulting photographic image is combined in register with a colored transparency whereby the black-an-d-white image is arranged on the back of the transparency.
• the desired color separation records for the photornechanical reproduction are prepared from the combina tion transparency+black and white image using for each separation record suitable colored separation filter.
• a process for producing color corrected color separation records of multicolor photographic images which consist of yellow, magenta and cyan partial images which comprises (a) exposing to a multicolor photographic image illuminated with white light a light-sensitive photographic material comprising :a light-sensitive silver halide emulsion layer that is sensitive to red, green and blue light and a filter layer having a density to blue light of about 2.0, to green light of about 1.0 and to red light of about 0.35 being capable of being decolorized in photographic processing baths upon a transparent support in such a manner that the filter layer faces the light source,

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• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Chemical & Material Sciences (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Spectroscopy & Molecular Physics (AREA)
• Silver Salt Photography Or Processing Solution Therefor (AREA)

Applications Claiming Priority (1)

Publications (1)

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Cited By (1)

Citations (18)

• 0
  • BE BE621239D patent/BE621239A/xx unknown
• 1961
  • 1961-08-09 DE DEA38098A patent/DE1140815B/de active Pending
• 1962
  • 1962-07-19 CH CH869162A patent/CH428431A/de unknown
  • 1962-07-23 AT AT591962A patent/AT245932B/de active
  • 1962-07-26 US US212738A patent/US3291602A/en not_active Expired - Lifetime
  • 1962-08-08 GB GB30413/62A patent/GB983887A/en not_active Expired

Patent Citations (18)

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