EP0025775A2 - Process for the production of a monochromatic colour image, and photographic material suited therefor - Google Patents

Abstract

Photographic material for producing a monochromatic color image with at least one photosensitive silver halide emulsion layer containing a yellow coupler and a small amount of a more reactive coupler. A colored image is created, for which black and white paper is not sensitive. The more reactive coupler reduces fogging at the highlights. Preferably, there are small amounts of further couplers in the light-sensitive layer (s), which result in a green or brown image which makes it easier for the user to focus.

Description

The present invention relates to the production of monochromatic color images using silver halide photographic material.

In normal color photography, three color images are usually produced by imagewise exposure and color development of color photographic material, a blue-green, a yellow and a purple image being present in at least one layer each. If these images are viewed together in the color tripack, they produce either a positive or a negative color rendering of the original, depending on the color photographic material used, the latter being able to be used to produce a positive color rendering of the original. However, color photographic material is also known which, after color development, results in a monochromatic reproduction of the original, i.e. a single color image of the original, similar to a silver image, instead of the color image composed of three colors and made up of color photographic material.

The formation of a monochromatic color image instead of a silver image serves to produce an almost grain-free image that can be used for enlargement purposes. This has the further advantage that all of the silver present in the exposed silver halide material can be recovered, since the processed material contains no silver.

Photographic material that provides a monochromatic image was described in British Patents 490,517 and 492,518 in 1938. In these two patents, the invention consisted in producing black or at least dark gray, monochromatic color images that can be used for enlargement purposes. However, normal photographic silver halide enlarging paper is only sensitive to blue-green light, so it can be used in a dark room with yellow lighting. In the case of monochromatic material to be used for enlargement purposes, it is therefore only necessary to produce a yellow-orange image, since this absorbs blue-green light. Nevertheless, it is often desirable to create another color image along with the yellow-orange image so as to obtain an image that is more visible to the user and useful for image composition and focusing under darkroom conditions. In order to distinguish an image made from color photographic material and composed of three colors, such a composite image formed from two or more dyes in the same layer is referred to in this patent as a monochromatic image.

Despite the obvious advantages of using a practically grain-free monochromatic color image for the production of enlargements and the associated advantage of a complete silver recovery, the process has hardly been used commercially. The reason is probably that the color development is more active than the normal silver halide development and leads to an undesirably high degree of fog in the monochromatic image material. This is associated with a reduction in the contrast.

The object of the present invention is now to provide color coupler-containing silver halide photographic material which, after color development and bleaching of the silver image, provides a monochromatic color image, but when used it has the effect of the high activity of color development on Minimum dimension is reduced.

The present invention therefore relates to a silver halide photographic material for producing a monochromatic color image by a chromogen process, characterized in that the material comprises, in at least one silver halide emulsion layer, a color coupler which couples with oxidized color developer of the primary aromatic amine type to form a yellowish dye, and the light absorbed in the range of 350 to 560 nm, a more reactive (as defined below) coupler which reacts with oxidized primary amine type color developer to form a dye whose absorption is predominantly above 560 nm, and optionally contains further color couplers, the Ratio of the yellowish dye-forming coupler to the more reactive coupler, in parts by weight, is 10: 0.1 to 10: 2.0.

The present invention furthermore relates to a method for producing a monochromatic color image by using the photographic material according to the invention.

A dye whose absorption is predominantly above 560 nm means one that absorbs at least 90% above 560 nm. Typically, one chooses a reactive coupler that produces a dye with total absorption above 560 nm, but it is sometimes desirable to increase some of the absorption below 560 nm to increase image density.

The term "more reactive coupler" used in the following denotes a coupler which couples more easily with oxidized color developer than the yellow couplers also present in the same layer and thereby forms a dye which absorbs above 560 nm. A test that shows the comparable responsiveness of Coupler connections explained will be described below.

An active cyan coupler is particularly preferred as the more reactive coupler. The reaction product of a cyan coupler and oxidized color developer is a dye that is in the range of 620 to 690 nm, i.e. above 560 nm.

Since it is difficult for photographic enlargement to focus a film with only one yellow image, the silver halide emulsion layer containing the yellowish dye-forming coupler and the more reactive coupler preferably contains another coupler or a mixture of couplers which or that with the coupler producing a yellowish dye either produces a green image or, which is particularly advantageous, produces a brown image. For example, there may also be a cyan coupler that is either less reactive or less reactive than the coupler that produces a yellowish dye. In the presence of such a cyan coupler, the preferred ratios of the three coupler compounds are 10 parts coupler that gives a yellowish dye, 2 to 4 parts cyan coupler, and 0.1 to 2.0 parts more reactive coupler. This gives a green final image. In order to produce a brown final image, a magenta coupler must also be present in the silver halide emulsion layer containing these three couplers. This magenta coupler is said to be either less reactive or less reactive than the coupler that produces a yellowish dye. In the presence of such a magenta coupler, the preferred ratios of the four coupler compounds are 10 parts of the yellowish dye-forming coupler, 2 to 4 parts magenta couplers, 2 to 4 parts cyan couplers, and 0.1 to 2.0 parts more reactive couplers. A cyan coupler is also particularly preferred as the more reactive coupler compound.

In a preferred embodiment, a so-called DIR coupler [Development Inhibitor-Releasing = releasing a development retarder] is also present in the layer containing the yellowish dye coupler, the magenta coupler, the cyan coupler and the more reactive coupler. This is a coupler compound that reacts with the oxidized color developer to release a developmentally retarding compound (DI). A DIR coupler is preferably a color coupler, and particularly preferably a yellow DIR color coupler.

Examples of DIR color couplers can be found in British patents 980 507 and 1 250 318.

Preferably, only a small amount of DIR coupler is incorporated in the silver halide emulsion layer containing the other color couplers and the more reactive coupler compound.

Preferred silver halide photographic material thus contains, in at least one silver halide emulsion layer, 10 parts of the yellowish dye-providing coupler, 2 to 4 parts of less reactive cyan coupler, 2 to 4 parts of magenta coupler, 0.5 to 1.5 parts of the more active cyan coupler and 0.1 to 1, 0, or preferably 0.1 to 0.4 parts of a yellow DIR color coupler ^* .

The preferred silver halide photographic material has a casting weight of 4 to 5 g / m ^{2 of} silver and a casting weight of 1.0 to 2.5 g / m ² of the coupler providing the yellowish dye.

The present invention further relates to a process for producing a monochromatic color image, wherein the photographic silver halide material, which contains in at least one silver halide emulsion layer a coupler providing the yellowish dye and a small amount of a more reactive coupler as defined above, is exposed imagewise, the exposure Material with a color developing solution containing a primary aromatic amine as color developer and the resulting silver image bleaches into a monochromatic color image. The color developer is preferably a para-phenylenediamine developer.

With this process, only small amounts of oxidized developer form at the little or unexposed areas. This is largely due to the formation of fog, i.e. these latent parts of the image were not caused by imagewise exposure but by other factors. At such points, the color couplers compete for the oxidized developer formed. The most reactive color coupler will react with the greater part of the color developer. Thus, if the preferred photographic material is used in this process, i.e. If a cyan coupler is used as a more reactive coupler, the veil area turns blue-green. However, since blue-green does not absorb blue light, this area is “not visible” for the copy paper used to produce copies of a negative produced by the method according to the invention. However, incorporating too much active cyan coupler into the silver halide emulsion layer of the photographic material results in an intolerable loss of sensitivity because it competes with the yellowish dye-forming coupler where the yellow image is to be formed.

However, as indicated above, it is advantageous if the silver halide emulsion layer contains less of a less reactive cyan coupler and a magenta coupler compared to the amount of the yellowish dye-forming coupler. These couplers compete with the yellowish dye-forming coupler and give rise to a brown color image in the exposed areas.

As indicated, the silver halide photographic paper "sees" only the blue absorbent component (yellowish dye) of the brown image. The red-absorbing components (teal green dye and purple dye) of the brown image serve to increase the visual contrast of the color image in the negative, so that the user can more easily focus on the copy paper.

As indicated, a small amount of a DIR coupler is preferably still present in the silver halide emulsion layer of the photographic material. In the process according to the invention, the release of the DI compound in the fog region is greatly reduced by the presence of the more reactive coupler. At higher exposure points, however, the DI connection is released from the DIR coupler. This results in a higher contrast image in the low exposure areas and an increased edge effect in high exposure areas where maximum compensation is required for the loss of sharpness caused by scattering.

In the material produced by the process according to the invention, when the particularly preferred material according to the invention is used, the yellowish dye-forming coupler, the purple coupler and the yellow DIR coupler all contribute to the yellow-orange component of the brown color image, which is visible to the copy paper, while Both the more reactive and the less reactive cyan coupler contribute to the cyan component of the brown color image, with a predominantly blue-green color image being produced in the veil area.

In one embodiment of the photographic material according to the invention, it contains two silver halide emulsion layers, both of which contain a yellowish dye-forming coupler and a more reactive coupler, but when processed, a similar monochromatic image in both silver halide emulsion layers are formed. Preferably, each silver halide emulsion layer contains the same mixture of the five types of color couplers described above. However, a silver halide / coupler ratio which is different in the two layers is particularly preferred. The photographic sensitivity of the two layers is also different.

The upper layer in the material contains a highly sensitive and the lower layer a less sensitive silver halide emulsion. This combination gives the entire photographic material a broadened sensitivity range, so that objects with a wide range of luminance can be reproduced satisfactorily and a good overexposure range is achieved. The silver halide / coupler ratio in the two layers is preferably different. The ratio is higher in the highly sensitive layer than in the less sensitive layer. The high ratio results in a weak grain in the highly sensitive layer, and the low ratio leads to good sound reproduction in the less sensitive layer, where the grain is of less importance.

In the photographic material according to the invention, the (both) silver halide layer (s) is (are) optically sensitized with optical sensitizing dyes, preferably panchromatically sensitized, i.e. the sensitivity ranges from 400 to 700 nm, i.e. over the entire visible spectral range.

The yellowish dye-forming coupler used in the photographic material is preferably a pivaloylacetanilide or benzoylacetanilide yellow coupler.

Pivaloylacetanilide yellow couplers are described, for example, in British Patent 1,078,338.

Benzoylacetanilide yellow couplers are described, for example, in U.S. Patent 2,407,210.

worin R ein Substituent, n 0, 1 oder 2, R₂ Wasserstoff oder eine Abgangsgruppe (einschliesslich einer DI-Gruppe) und BAL' eine Ballastgruppe ist, um den Kuppler in der Schicht, in der er eingegossen ist, substantiv zu machen.A suitable pivaloylacetanilide yellow coupler corresponds to the general formula

wherein R is a substituent, n is 0, 1 or 2, R _{2 is} hydrogen or a leaving group (including a DI group) and BAL 'is a ballast group to make the coupler substantive in the layer in which it is cast.

The ballast group is, for example, a 2,4-dialkylphenoxy radical bonded to an -NHCO- (CH ₂ ) _m group, the alkyl groups each having at least 5 carbon atoms and m being an integer from 1 to 5.

Preferably n is 1 and R is lower alkyl or alkoxy each having 1 to 4 carbon atoms or chlorine or bromine.

A particularly preferred radical R ₁ is chlorine.

Examples of suitable yellow couplers of formula (1) are found in U.S. Patents 3,265,506 and 3,384,657.

worin R₁, n, R₂ und BAL' die oben angegebenen Bedeutungen haben.A suitable yellow benzoylacetanilide coupler corresponds to the general formula

wherein R ₁ , n, R ₂ and BAL 'have the meanings given above.

und

worin R₁, n und BAL' die oben angegebenen Bedeutungen haben und R₂₂ eine DI-Verbindung, z.B. eine Alkylthiotriazol-, Mercapto-, Mercaptotetrazol- oder Benzotriazolgruppe darstellt. Beispiele für verwendbare, gegebenenfalls vorhandene DI-Verbindungen sind a) Alkylthiotriazole der allgemeinen Formel

worin R₃ Alkyl mit 4 bis 8 Kohlenstoffatomen ist, wie z.B. Pentyl, Hexyl oder Heptyl, (wie in der britischen Patentschrift 1 520 880 beschrieben), b) Gruppen der allgemeinen Formel -S-R₄, worin R₄ Alkyl mit 4 bis 8, vorzugsweise 5 oder 6 Kohlenstoffatomen oder Aryl, z.B. Phenyl oder Naphthyl, ist (wie in der britischen Patentschrift 953 454 beschrieben), c) l-Phenyl-5-mercaptotetrazol der Formel

und d) 1,2,3-Benztriazolylgruppen der allgemeinen Formel

worin R₁₂ wahlweise Substituenten darstellt und n 1 bis 3 ist. Verbindungen dieses Typs sind in der britischen Patentschrift 1 250 318 beschrieben.Suitable DIR couplers correspond to the general formulas

and

wherein R ₁ , n and BAL 'have the meanings given above and R _{22 is} a DI compound, for example an alkylthiotriazole, mercapto, mercaptotetrazole or benzotriazole group. Examples of usable, optionally present DI compounds are a) alkylthiotriazoles of the general formula

in which R _{3 is} alkyl having 4 to 8 carbon atoms, such as, for example, pentyl, hexyl or heptyl (as described in British Patent 1,520,880), b) groups of the general formula -SR ₄ , in which R _{4 is} alkyl having 4 to 8, preferably 5 or 6 carbon atoms or aryl, for example phenyl or naphthyl, (as described in British patent specification 953 454), c) l-phenyl-5-mercaptotetrazole of the formula

and d) 1,2,3-benzotriazolyl groups of the general formula

wherein R ₁₂ optionally represents substituents and n is 1 to 3. Compounds of this type are described in British Patent 1,250,318.

R ₁₂ is preferably hydrogen or alkyl having 1 to 4 carbon atoms.

In a preferred embodiment of the photographic material according to the invention, the yellow coupler in the or each silver halide emulsion layer is a pivaloyl coupler of the formula (1), in which R _{2 is} hydrogen. The DIR coupler is a pivaloyl coupler of formula (3), wherein R _{22 represents} either an alkylthiotriazole of formula (5) or 1-phenyl-5-mercaptotetrazole.

worin R₄ Wasserstoff, Halogen oder Alkoxy, L eine Brückengruppe und BAL eine Ballastgruppe darstellt.Particularly suitable reactive cyan couplers which can be used in the photographic material according to the invention are naphthol cyan couplers of the general formula

wherein R _{4 is} hydrogen, halogen or alkoxy, L is a bridging group and BAL is a ballast group.

The halogen R _{4 is} preferably chlorine or bromine. Suitable alkoxy groups R ₄ are methoxy and ethoxy. Preferred bridge groups L correspond to the formula -COCHR ₃₂ -, wherein R _{32 is} hydrogen or lower alkyl. The ballast group is preferably a dialkylphenoxy radical, in which the alkyl groups each contain at least 5 carbon atoms.

Examples of naphthol-cyan couplers of formula (8) can be found in British Patent 1,543,040.

Examples of useful, less reactive cyan couplers to be used in the photographic material according to the invention are given, for example, in German Patent 1,137,311.

However, less reactive cyan couplers are preferred which, when coupled, provide a dye whose absorption maximum is below 700 nm. Therefore, it is preferred not to use a naphthol coupler but a phenol cyan coupler.

worin R₆ Wasserstoff oder Halogen ist, R₇ und R₈ je Wasserstoff, Halogen oder Alkyl mit 1 bis 4 Kohlenstoffatomen sind, R₉ Wasserstoff oder Alkyl mit 1 bis 4 Kohlenstoffatomen ist und R₁₀ und R₁₁ je Alkyl mit 5 bis 10 Kohlenstoffatomen bedeuten.A suitable class of useful phenol cyan couplers includes those of the general formula

wherein R _{6 is} hydrogen or halogen, R ₇ and R _{8 are} each hydrogen, halogen or alkyl having 1 to 4 carbon atoms, R _{9 is} hydrogen or alkyl having 1 to 4 carbon atoms and R ₁₀ and R _{11 are} each alkyl having 5 to 10 carbon atoms mean.

As halogen, R _{6 is} preferably chlorine or bromine. Preferred alkyl groups for the radicals R ₇ , R ₈ and R are methyl, ethyl, propyl and butyl. Suitable alkyl groups R ₁₀ and R ₁₁ are pentyl, hexyl, Heptyl, octyl, nonyl, decyl and the corresponding isomers.

Numerous magenta couplers can be used in the photographic material according to the invention. Examples of such magenta couplers are described in U.S. Patent 2 908 573 and British Patent Nos. 680 488 and 1 129 333.

entsprechen, worin R Wasserstoff oder eine Carbonsäureacylgruppe R'-CO-, wobei R' Alkyl mit 1 bis 4 Kohlenstoffatomen bedeutet, R₂ eine Carbonsäureacylgruppe R'-CO- und R₃ Wasserstoff, Alkyl mit 1 bis 4 Kohlenstoffatomen oder gegebenenfalls substituiertes Phenyl ist.Particularly suitable are those purple couplers which are described in British Patent No. 865 721 and which have the general formula

correspond in which R is hydrogen or a carboxylic acyl group R'-CO-, where R 'is alkyl having 1 to 4 carbon atoms, R _{2 is} a carboxylic acid acyl group R'-CO- and R _{3 is} hydrogen, alkyl having 1 to 4 carbon atoms or optionally substituted phenyl .

R 'is preferably methyl or ethyl. For R ₃ as alkyl having 1 to 4 carbon atoms, methyl, ethyl and butyl are preferred. If R _{3 is} substituted phenyl, chlorine, methoxy, ethoxy or methyl are suitable as substituents on the phenyl group.

All color couplers are preferably present in the silver halide emulsion layer (s) as an oil dispersion. The couplers can be prepared and added in a single oil dispersion or added as separate oil dispersions.

The photographic material of the invention can be poured onto any of the conventional transparent film supports, including cellulose triacetate, cellulose acetate butyrate and subbed and oriented polyethylene terephthalate.

A silver bromoiodide with a halide ratio of 1.5 to 10% iodide on bromide is preferably used as the silver halide.

The silver halide is preferably panchromatically sensitized, using at least one optically green-sensitizing dye and at least one optically red-sensitizing dye.

Optionally, the silver halide emulsion is chemically sensitized with sulfur and / or gold sensitizers as well as with polyethylene oxide compounds or with other chemical sensitizers such as are used to sensitize highly sensitive camera film emulsions.

Optionally, the silver halide emulsion is stabilized by the presence of stabilizer compounds as used to stabilize such emulsions, e.g. Tetraazaindene compounds and mercaptotriazole compounds, stabilized.

The binder for the silver halide crystals in the silver halide emulsion is preferably gelatin. However, so-called gelatin extenders such as acrylamides and polyvinyl alcohol can be present. Latex polymers such as those derived from acrylic and methacrylic acid alkyl esters may also be present.

The binder can be cured with any of the well known binders for hydrophilic colloids such as formaldehyde, glyoxal and triazine derivatives.

• (I). Gelbkuppler der Formel
  
  5-{γ-[2,4-Bis-(1,1-dimethylpropyl)-phenoxy]-butyramido}-2-chlor-α-[5-isopropyl-2-(4-tolylsulfonylimino)-Δ⁴-1,3,4-thiadiazolinyl-3]-α-pivaloylacetanilid,
• (II). Purpurkuppler der Formel
  
  3-{3-[(2,4-Bis-[1,1-dimethylpropyl]-phenoxy)-acetamido]-benzamido}-1-(2,4,6-trichlorphenyl)-2-pyrazolinon-(5),
• (III). aktiver Blaugrünkuppler der Formel
  
  2-t5-[(2,4-Bis-(1,1-dimethylpropyl)-phenoxy)-phenoxy)-acetamido]-2- chlorphenyl-carbamoyl}-naphthol-(1),
• (IV). weniger reaktionsfähiger Blaugrünkuppler der Formel
  
  6-{α-[2,4-Bis-(1,1-dimethylpropyl)-phenoxyl-butyramido}-2,4-dichlor-3-methylphenol,
• (V). gelber DIR-Kuppler der Formel
  
  5-{γ-[2,4-Bis-(1,1-dimethylpropyl)-phenoxy]-butyramido}-2-chlor-α-(3-hexylthio-1,2,4-triazolyl-1)-a-pivaloylacetanilid, (der Triazolylrest lässt sich auch in der isomeren Form
  
  schreiben), und
• (VI). Blaugrünkuppler der Formel
  
  2-{4-[2,4-Bis-(1,1-dimethylpropyl)-phenoxy]-butylcarbamoyl}-naphthol-(1).

The invention is illustrated by the following example. EXAMPLE: Couplers used:

• (I). Yellow coupler of the formula
  
  5- {γ- [2,4-bis (1,1-dimethylpropyl) phenoxy] butyl ramido} -2-chloro-α- [5-isopropyl-2- (4-tolylsulfonylimino) -Δ ⁴ -1, 3,4-thiadiazolinyl-3] -α-pivaloylacetanilide,
• (II). Purple coupler of the formula
  
  3- {3 - [(2,4-bis- [1,1-dimethylpropyl] phenoxy) acetamido] benzamido} -1- (2,4,6-trichlorophenyl) -2-pyrazolinone- (5),
• (III). active cyan coupler of the formula
  
  2-t5 - [(2,4-bis- (1,1-dimethylpropyl) phenoxy) phenoxy) acetamido] -2-chlorophenyl-carbamoyl} -naphthol- (1),
• (IV). less reactive cyan coupler of the formula
  
  6- {α- [2,4-bis (1,1-dimethylpropyl) phenoxyl-butyramido} -2,4-dichloro-3-methylphenol,
• (V). yellow DIR coupler of the formula
  
  5- {γ- [2,4-bis- (1,1-dimethylpropyl) phenoxy] butyl ramido} -2-chloro-α- (3-hexylthio-1,2,4-triazolyl-1) -a- pivaloylacetanilide, (The triazolyl radical can also be found in the isomeric form
  
  write and
• (VI). Teal coupler of the formula
  
  2- {4- [2,4-bis (1,1-dimethylpropyl) phenoxy] butylcarbamoyl} naphthol- (1).

Anhydro-(3-äthyl-2-benzothiazol)-[3-(3-sulfopropyl)-2-benzothiazol]-ß- methyltrimethincyaninhydroxyd.The silver halide emulsion used is panchromatically sensitized with 0.15 mg of the dye of the following formula:

Anhydro- (3-ethyl-2-benzothiazole) - [3- (3-sulfopropyl) -2-benzothiazole] -ß-methyltrimethine cyanine hydroxide.

The maximum sensitivity of this dye is 580 to 620 nm.

Das Gemisch wird mit Hilfe einer Kolloidmühle dispergiert.EXAMPLE 1 26.4 mg of yellow coupler (I), 8.8 mg of purple coupler (II), 2.2 mg of active cyan coupler (III), and 6.6 mg are placed in a panchromatically sensitized silver halide emulsion containing 70 mg of gelatin and 70 mg of silver less reactive cyan coupler (IV) and 1.2 mg yellow DIR coupler (V) incorporated. The couplers are added as an oil dispersion which has the following composition:

The mixture is dispersed using a colloid mill.

The dispersion is added to the aqueous emulsion with stirring by hand at 40 ° C. The mixture is poured onto a cellulose acetate support in a conventional manner and dried after solidification. The quantities given relate to 1 dm ^{2 of} carrier area.

A protective gelatin top layer is poured over this material (material A).

A second material (Material B) is made as above, but replacing the 2.2 mg active cyan coupler (III) with 2.2 mg less reactive cyan coupler (IV).

After exposure behind a stepless wedge, the material is treated at 37.8 ° C as follows:

The sensitometric properties of the processed film wedges are determined using a scanning sensitometer, which is calibrated so that it responds like black and white copy paper.

Results

The table shows that when the photographic material according to the invention is used, a strong decrease in the copy fog and an advantageous increase in the copy contrast is achieved with only a slight reduction in the threshold sensitivity.

Coupler activity test

A mixture of the oil-dispersed couplers (I) and (V) producing a yellow dye is prepared in a weight ratio of 25: 1.5. 26.5 mg samples are each mixed with 11 mg samples of the coupler to be tested. A reference sample is made by adding 11 mg less reactive cyan coupler (IV) to a 26.5 ml sample of (I) and (V).

The mixture is in each case dispersed in sufficient silver halide emulsion according to Example 1 to give 65 mg of silver, and poured onto a 1 dm glass plate.

The plates are exposed under a wedge and processed in the usual way. The blue densities are determined using a densitometer which is insensitive to red light. Those active couplers which result in a decrease in the yellow haze by at least 50% are preferred. In the results below, the cyan coupler (VI) is more active than the control, but results in an insufficient decrease in density. The mixture containing the coupler (III) proves to be more active and belongs to the type preferred according to the present invention.

Claims (17)

1. Silver halide photographic material for producing a monochromatic color image by a chromogen process, characterized in that the material in at least one silver halide emulsion layer has a color coupler that couples with oxidized color developer of a primary aromatic amine type to form a yellowish dye / and the light in the range of 350 absorbed up to 560 nm, a more reactive coupler which reacts with oxidized color developer of the primary amine type to form a dye, the absorption of which is predominantly above 560 nm, and optionally further color couplers, the ratio of the yellowish dye-producing coupler to the more reactive coupler , expressed in parts by weight, is 10: 0.1 to 10: 2.0. 2. Photographic material according to claim 1, characterized in that 'an active cyan coupler is present as the more reactive coupler compound. 3. Photographic material according to claim 2, characterized in that a cyan coupler of the general formula as an active cyan coupler

is present in which R _{4 is} hydrogen, halogen or alkoxy, L is a bridging group and BAL is a ballast group. 4. Photographic material according to claim 1, characterized in that the color coupler which couples with the oxidized color developer of the primary aromatic amine type to form a yellowish dye is a pivaloylacetanilide yellow coupler of the general formula

or a yellow benzoylacetanilide coupler of the general formula

in which R is a substituent, n is 0, 1 or: 2, R _{2 is} hydrogen or a leaving group and BAL 'is an an -NHCO- (CH ₂

Grouping is bound ballast group, where m is an integer from 1 to 5. 5. Photographic material according to one of claims 1 to 4, characterized in that it further contains in at least one silver halide layer a further coupler or a coupler mixture. 6. Photographic material according to claim 5, characterized in that there is a less reactive cyan coupler as a further coupler. 7. Photographic material according to claim 6, characterized in that the less reactive cyan coupler is a phenolic cyan coupler of the general formula

is where R _{6 is} hydrogen or halogen, R and R _{8 are} each hydrogen, halogen or alkyl having 1 to 4 carbon atoms and R _{9 is} hydrogen or alkyl having 1 to 4 carbon atoms and R ₁₀ and R _{11 are} each alkyl having 5 to 10 carbon atoms are. 8. Photographic material according to one of claims 1 to 7, characterized in that there are 10 parts of the yellowish dye-forming coupler, 0.1 to 2.0 parts of the active cyan coupler and 2 to 4 parts of the less reactive cyan coupler. 9. Photographic material according to one of claims 5 to 8, characterized in that a purple coupler is present as an additional color coupler. 10. Photographic material according to claim 9, characterized in that the additional magenta coupler is a compound of the general formulas

or

is where R is hydrogen or a carboxylic acyl group of the formula R'-CO-, where R 'is alkyl having 1 to 4 carbon atoms, R _{2 is} a carboxylic acid acyl group of the same formula, R _{3 is} hydrogen, alkyl having 1 to 4 carbon atoms or optionally substituted phenyl and BAL is a dialkylphenoxy radical, the alkyl radicals each containing at least 5 carbon atoms. 11. Photographic material according to any one of claims 1 to 10, characterized in that 10 parts of the yellowish dye-forming coupler, 0.1 to 2.0 parts of the active cyan coupler, 2 to 4 parts of the less reactive cyan coupler and 2 to 4 parts of the purple coupler. 12. Photographic material according to one of claims 5 to 11, characterized in that a DIR coupler is present as a further additional color coupler. 13. Photographic material according to claim 12, characterized in that the yellow DIR coupler is a color coupler of the general formulas

or

wherein R _{1 is} a substituent, n 0, 1 or 2, R _{22 is} a DI compound and BAL 'is a ballast group attached to an -NHCO (CH ₂ ) _{m group} , where m is an integer from 1 to 5 . 14. Photographic material according to one of claims 1 to 13, characterized in that 10 parts of the yellowish dye-forming coupler, 0.5 to 1.5 parts of the active cyan coupler, 2 to 4 parts of the less reactive cyan coupler, 2 to 4 Parts of purple coupler and 0.1 to 1.0, preferably 0.1 to 0.4 parts of the DIR coupler are present. 15. Photographic material according to claim 14, characterized in that the coupler producing a yellowish dye is a pivaloyl coupler of the formula

and as a DIR coupler, a pivaloyl coupler of the formula

are present in which R _{1 is} a substituent, n 0, 1 or 2 and BAL 'is a ballast group bonded to an -NHCO (CH ₂ ) m group, where m is an integer from 1 to 5, and R _{23 is} an alkylthiotetrazole or I-phenyl-5-mercaptotetrazole means. 16. Photographic material according to one of claims 1 to 15, characterized in that it contains two silver halide emulsion layers, both of which contain the yellowish dye-forming coupler and the more reactive coupler and optionally further color couplers according to one of claims 11 to 14. 17. A process for producing a monochromatic color image, characterized in that the photographic silver halide material according to one of claims 1 to 16 is exposed imagewise, the exposed material is developed with a color developing solution containing a color developer of the primary aromatic amine type and the resulting silver image is one monochromatic color image bleaches.