JP2729549B2 - How to create an original chart - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an original for electrophotography, a chart for color adjustment of a television image, an original for a silver halide photographic copying machine, and the like (hereinafter these are collectively referred to as "original charts").
A method for the creation of Luo original casing chart be used to re-create a) that.

[0002]

2. Description of the Related Art A silver halide color photographic light-sensitive material having a reflective support is used for various purposes. One of the uses is to prepare an original for electrophotography or a color adjustment chart for a television image. For example, there is the making or the original plate for the silver halide photocopier. The silver halide color photographic light-sensitive materials used in these, such as color photographic paper, in particular, originally have good sharpness, but recently high-quality televisions have appeared in color televisions, and high fidelity is required. Further, the photosensitive material to be used is required to have higher sharpness. Since the quality of electrophotographic materials has also been improved, sharpness has been increasingly required of the photosensitive materials in preparing originals.

[0003] As described above, in order to create these original charts, it is required to satisfy the conditions of good sharpness, beautiful colors, and good color separation. Of these, the original properties for color adjustment of television images on high-quality televisions and the originals for electrophotography are strongly required, while those for silver halide photographic copying machines are strongly required. You.

Further, when the silver halide color photographic light-sensitive material having the reflective support is used for general purposes other than the above-mentioned applications, the light-sensitive material is not affected by irregular reflection on the surface of the support at the time of exposure. There is a disadvantage that the sharpness of the image is deteriorated.To improve this disadvantage, a non-photosensitive layer is provided between the support and the photosensitive layer closest to the support, and the non-photosensitive layer contains colloidal silver. Then, this is usually formed as an antihalation layer, thereby enhancing sharpness. Therefore, a photosensitive material provided with an antihalation layer containing colloidal silver is suitable for the purpose of improving the sharpness described above.

However, the conventional reflection type silver halide color photographic material having the antihalation layer causes fogging and a decrease in the maximum density during storage before exposure, and causes sensitization and desensitization due to pressure. There is a problem that the non-photosensitive layer serving as the antihalation layer contains a high-boiling solvent together with colloidal silver in JP-A-3-113443.
It has improved storage and pressure characteristics. In this improved light-sensitive material, a conventional silver iodobromide emulsion is specifically used as an emulsion.

[0006]

By the way, recently, silver halide photographic materials have been required to shorten the processing time in order to improve the service like finishing on the same day.
In order to satisfy the demand, the silver halide emulsion used has been changed from silver bromide to silver chloride. It is said that the total processing time is reduced by about 3 minutes when the silver halide emulsion is changed to a high silver chloride emulsion.

However, when a high silver chloride emulsion is used as the silver halide emulsion, the silver chloride is easily dissolved in the processing solution during color development, so that the dissolved silver chloride tends to dissolve in the colloidal silver-containing layer. Go into This causes silver to be deposited in the subsequent processing, and this silver acts as a development nucleus, and causes so-called physical development. The fact that silver grows due to the nature of silver halide in the emulsion of the light-sensitive material causes a kind of development fog. Then, a yellow layer is formed on the photosensitive material, for example, a color photographic paper by the action. This causes noise on the white background of the color photographic paper.

As described above, in a photosensitive material having an antihalation layer containing colloidal silver, the sharpness is improved because the black colloidal silver is laid under the emulsion layer. Accordingly, an object of the present invention is to provide a processing method for obtaining a photograph having good sharpness without causing these problems and without lowering the sensitivity and gradation, or a method for manufacturing an original chart. Things.

[0009]

The present invention has achieved the above object by the following means. (1) After exposing a color printing paper having an antihalation layer containing colloidal silver and an emulsion layer composed of a high silver chloride emulsion on the reflection surface side of the support, a bromine ion of 0.2 mM / liter to 100 mM / liter and / or Or a thiol-substituted or thione-substituted nitrogen-containing heterocyclic compound 0.02 mM /
A method for producing an original chart, wherein the processing is performed with a color developing solution in the presence of 1 to 10 mM / liter.

The present invention will be described in more detail. The silver halide color photographic light-sensitive material used in the present invention is color
The photographic paper has an antihalation layer containing colloidal silver on the reflection surface side of a reflection support, and an emulsion layer is formed thereon. This reflective support may be any opaque or translucent support conventionally used for the photosensitive material,
Such materials include, for example, paper, baryta paper, synthetic paper, laminated paper, coated paper, polyolefin-coated paper, translucent or opaque plastic film containing white pigment, and both sides coated with polyethylene containing white pigment. Paper and the like. Of these, a laminate in which a polyethylene layer is laminated on both sides of a baryta paper or a film in which a titanium oxide pigment is dispersed based on polyethylene terephthalate is preferable, and the latter has excellent flatness. Also, the above-mentioned baryta paper obtained by laminating a polyethylene layer on both sides and laminating an aluminum foil on one side are preferable because of good reflectivity. This support may have an undercoat layer on the side coated with the emulsion layer and a backing layer on the opposite side.

An antihalation layer containing colloidal silver is provided below the emulsion layer on the side of the reflection support on which the emulsion layer is coated. Various types of colloidal silver can be used, but black colloidal silver is preferably used in order to prevent irregular reflection on the reflective surface of the support for visible light. The coating amount of the black colloidal silver is 0.01 g / m
^{2 to} 1.0 g / m ² , preferably 0.03 to 0.3 g / m ²
g / m ² is preferred. The colloidal silver is usually applied in a mixture with a hydrocolloid like gelatin. The light-sensitive material used in the present invention has at least one of a red light-sensitive layer, a green light-sensitive layer, and a blue light-sensitive layer as silver halide emulsion layers. It consists of an emulsion. Here, the term "high silver chloride emulsion" refers to a silver halide emulsion containing 95 mol% or more of silver chloride, and the proportion of silver chloride is preferably high, for example, 99 mol% or more. What you do is good. The other halogen in the silver halide is preferably bromine, and it is less preferable to contain iodine.

The silver halide grains in the photographic emulsion can take various shapes, and those having regular crystals can be used, and tabular grains can be used.
The grain size of the silver halide may be any of fine grains of 0.1 micron or less to large grains having a projected area diameter of 10 microns, and may be a monodisperse emulsion having a narrow distribution or a polydisperse emulsion having a wide distribution. An emulsion may be used.

The photographic emulsion used in the present invention is described in "Physics and Chemistry of Photography" by Grafkid, published by Paul Montell (P.
Glafkids, Chimie et Physi
que Photographique, Paul M
ontel, 1967), "Photographic Emulsion Chemistry" by Duffin, published by Focal Press (GF Duffin,
Photographic Emulsion Che
mistry (FocalPress, 1966), "Production and Coating of Photographic Emulsion", by Zerikman et al., Published by Focal Press (VL Zelikman et al., M.
aking andCoating Photogra
phy Emulsion, FocalPress,
1964) and the like. That is, any of an acidic method, a neutral method, an ammonia method and the like may be used, and a method of reacting a soluble silver salt and a soluble halide may be any one of a one-side mixing method, a simultaneous mixing method, and a combination thereof. Good.

The properties of silver halide grains can be controlled by the presence of various compounds during the process of silver halide precipitation. The resulting silver halide emulsion is chemically sensitized. Chemical sensitization is known as pAg 5-10, pH 5
-8 and a temperature of 30-80 ° C using sulfur, selenium, tellurium, gold, platinum, palladium, iridium or a combination of these sensitizers.

The silver halide emulsion used in the present invention can be spectrally sensitized with methine dyes and other spectral sensitizing dyes. As the dye to be used, known cyanine dyes, merocyanine dyes, complex merocyanine dyes and the like can be used. Further, various color couplers can be used in the light-sensitive material used in the present invention. Known yellow couplers, magenta couplers and cyan couplers can be used, and there are four equivalent couplers and two equivalent couplers, respectively, and usually two equivalent couplers are used. In addition, a coupler having a moderately diffusible coloring dye or a DIR coupler or a DAR coupler can be used as a coupler to improve granularity.

Further, the photosensitive material may contain one or more kinds of additives for various purposes such as coating aid, antistatic, improvement of slipperiness, emulsification / dispersion, prevention of adhesion and improvement of photographic properties (for example, development acceleration, high contrast, sensitization). It may contain a surfactant. In addition, the light-sensitive material may contain a water-soluble dye in a hydrophilic colloid layer as a filter dye or for various purposes such as prevention of irradiation or halation, such as oxonol. Dyes, hemioxonol dyes, styryl dyes, merocyanine dyes and the like are preferably used. Further, various photographic additives such as a color fogging inhibitor or a color mixing inhibitor, and an ultraviolet absorber can be added to the light-sensitive material.

In the present invention, when the light-sensitive material is processed with a color developer after exposure, a thiol-substituted or thione-substituted nitrogen-containing heterocyclic compound is contained in the color developer at 0.02 mM / liter to 10 mM / liter. Although it may be present, it is not necessary to use a color developer containing the nitrogen-containing heterocyclic compound in advance, and the color developer may be present in the liquid at the time of processing. May be contained in the photosensitive material. For example, the above-mentioned nitrogen-containing heterocyclic compound may be contained in the hydrocolloid layer of the light-sensitive material, and may be eluted into the color developer during processing so that a predetermined concentration is maintained in the color developer. Good. The type of the nitrogen-containing heterocyclic compound to be contained will be described later.

In the present invention, after the above-mentioned photosensitive material is exposed, processing such as color development, desilvering, and washing with water is performed. Various processing steps can be taken. Have been. A. Color development-bleach-fix-water-dry-B. 〃-Wash-bleach-fix-wash-dry 〃-Bleaching-Fixing-Washing-Drying 〃-〃-Bleaching-fixing-fixing-washing-drying 〃-〃-Bleaching-fixing-Washing-Drying 〃-Fixing-Bleaching-Fixing-Washing-Drying 〃-bleaching-washing-fixing-washing-fixing-drying 〃-Bleaching-Fixing-Washing-Stable-Drying 〃-Bleaching-Bleaching-Fixing-Washing-Stable-Drying 〃-Bleaching-fixing-Washing-Stable-Drying 〃-Fixing-bleach-fixing-washing-stable-drying In the method of the present invention, when the above-mentioned light-sensitive material is processed with a color developing solution in color development, 0.2 to 100 mM / liter of bromine ions and / or The treatment is performed in the presence of a thiol-substituted or thione-substituted nitrogen-containing heterocyclic compound at 0.02 mM / liter to 10 mM / liter. That is, the treatment is carried out in the presence of bromine ions and / or the heterocyclic compound.

In order for the bromine ions to be present in the color developing solution, a bromine compound which releases bromine ions may be dissolved in the color developing solution.
Although various compounds can be used, for example, potassium bromide, sodium bromide, ammonium bromide and the like are preferably used. When a silver halide color photographic light-sensitive material having a silver halide emulsion mainly composed of silver bromide is used, bromine ions come into the color developing solution from the light-sensitive material to be processed. Since the light-sensitive material has a high silver chloride emulsion, bromine ions hardly enter from the light-sensitive material.

For the presence of the thiol-substituted or thione-substituted nitrogen-containing heterocyclic compound, a predetermined amount of this heterocyclic compound may be dissolved in a color developing solution. It may be included in a hydrocolloid layer, such as a layer, and eluted therefrom during processing. At that time, the above-mentioned heterocyclic compound is present in the color developer during the processing so that the above-mentioned amount is present.
The content is selected in consideration of various conditions such as the processing amount of the photosensitive material and the replenishment amount of the color developing solution.

The thiol-substituted or thione-substituted nitrogen-containing heterocyclic compound used herein includes imidazoles,
Triazoles, tetrazoles, pyrimidines, benzothiazolines, benzotriazoles, indazoles, specifically, for example, benzotriazole,
6-nitrobenzimidazole, 2-mercapto-imidazole, 5-nitroisoindazole, 5-methylbenzotriazole, 5-nitrobenzotriazole, 5
-Chloro-benzotriazole, 2-thiazolyl-benzimidazole, 2-thiazolylmethyl-benzimidazole, indazole, hydroxyazaindolizine,
Adenine and the like can be mentioned as typical examples.

As the color developer in which these bromine ions and / or the heterocyclic compound are present, any of known color developers can be used, and the color developer used therein is preferably This is an alkaline aqueous solution mainly containing an aromatic primary amine color developing agent. Aminophenol compounds are also useful as the color developing agent, but p-phenylenediamine compounds are preferably used. Representative examples thereof include 3-methyl-4-simino-N, N-diethylaniline and 3-methylaniline. -4-amino-N-ethyl-N-β-hydroxylethylaniline, 3-methyl-4-amino-N-ethyl-
N-β-methanesulfonamidoethylaniline, 3-methyl-4-amino-N-ethyl-N-β-methoxyethylaniline and their sulfates, hydrochlorides, phosphates or p-toluenesulfonates, tetra Phenyl borate, p- (t-octyl) benzene sulfonate and the like can be mentioned. These diamines are generally more stable in a salt than in a free state, and are preferably used.

Examples of the aminophenol derivatives include, for example, o-aminophenol, p-aminophenol,
-Amino-2-methylphenol, 2-amino-3-methylphenol, 3-oxy-3-amino-1,4-dimethylbenzene and the like. In addition, L. F. A. Messon, Photographic Processing Chemistry, Focal Press (1966) (L.
F. A. Mason, "Photographic P
processing Chemistry, Focal
Press) at pages 226-229, U.S. Pat.
Nos. 93,015 and 2,592,364;
-64933 may be used. If necessary, two or more color developing agents can be used in combination.

The color developing solution is a pH buffer such as an alkali metal carbonate, borate or phosphate; bromide,
Development inhibitors or antifoggants such as iodides, benzothiazoles or mercapto compounds; hydroxylamine, diethylhydroxylamine, triethanolamine, West German Patent Application (OLS) 2622250
Preservatives such as sulfites or bisulfites; organic solvents such as diethylene glycol; benzyl alcohol, polyethylene glycol, quaternary ammonium salts, amines, thiocyanates, 3,6-thiaoctane- Development accelerators such as 1,8-diol; dye-forming couplers; competing couplers; nucleating agents such as sodium boron hydride; auxiliary developing agents such as 1-phenyl-3-pyrazolidone; , Nitrilotriacetic acid, cyclohexanediaminetetraacetic acid, iminodiacetic acid, N-hydroxymethylethylenediaminetriacetic acid, diethylenetriaminepentaacetic acid, triethylenetetraminehexaacetic acid, and JP-A-58-195845.
Aminopolycarboxylic acid typified by the compounds described in No. 1, 1-hydroxyethylidene-1,1'-diphosphonic acid, Research Disclosure 18170 (197)
May 1997) organic phosphonic acid, aminotris (methylene phosphonic acid), ethylenediamine-N, N, N ',
Aminophosphonic acids such as N'-tetramethylenephosphonic acid, JP-A-52-102726 and JP-A-53-42730;
Nos. 54-12127, 55-4024, 55-4025, 55-126241, and 55-
Nos. 65555, 55-65556, and Research Disclosure 18170 (May 1979)
Chelating agents such as the described phosphonocarboxylic acids can be included.

The color developing agent is generally used at a concentration of about 0.1 g to about 30 g per liter of the color developer, more preferably at a concentration of about 1 g to about 15 g per liter of the color developer. Further, the pH of the color developing solution is usually 7 or more, and most commonly, about 9 to about 13. The replenishing amount can also be reduced by using a replenishing solution in which the concentration of a halide, a color developing agent or the like is adjusted as the color developing solution.

In the present invention, it is preferable that the above-mentioned benzyl alcohol is not substantially contained as a development accelerator. Here, "substantially not contained" means that 2 ml or less, preferably 0.5 ml or less, more preferably not contained at all, per liter of the color developing solution. When benzyl alcohol is not contained, the present invention exerts a better effect.

The processing temperature of the color developing solution of the present invention is from 20 to 5
The temperature is preferably 0 ° C, more preferably 30 to 40 ° C.
The processing time is 20 seconds to 10 minutes, preferably 30 seconds to 5 minutes. The color-developed light-sensitive material is subjected to bleaching, fixing or bleach-fixing as described above, or desilvering by combining these steps. As the bleaching solution, the fixing solution or the bleach-fixing solution used in these steps, those having a known composition can be used. As the bleaching agent used in the bleaching solution or the bleach-fixing solution, ferric ion A typical example is a complex, which is a complex of ferric ion with a chelating agent such as aminopolycarboxylic acid, aminopolyphosphonic acid or a salt thereof. Numerous chelating agents such as aminopolycarboxylic acids and aminopolyphosphonic acids or salts thereof are known. As the fixing solution, known fixing agents, for example, those having a known composition containing sodium thiosulfate, ammonium thiosulfate, etc., can be used. For example, thioether compounds, mesoionic compounds, urea compounds, imidazole compounds, indazole compounds and the like can also be used. These may be used in combination. The desilvered light-sensitive material is processed with a stabilizing solution and / or washing water.
And finally dry.

The processed photosensitive material obtained by the above processing has high sharpness. The sharpness as the sharpness scale can be evaluated by a known measuring means. Therefore, the light-sensitive material processed according to the present invention can be used for color originals for copying machines and original charts such as charts.

[0029]

Since the silver halide color photographic light-sensitive material used in the present invention has a high silver chloride emulsion, the silver chloride dissolves and enters the colloidal silver in the antihalation layer, where it precipitates and forms a kind of physical material. It is easy to cause a state of development,
In the present invention, it is possible to prevent such a state from occurring by performing processing with a color developing solution in the presence of a specific amount of bromine ions and / or the heterocyclic compound during color development of the photosensitive material. it can.

[0030] Sodium bromide, which is an example of the bromine ion to be present, and the above-mentioned heterocyclic compound are known as antifoggants. However, when fogging occurs, Dmin increases. Has an additional function of improving the sharpness of the original chart by adding these ions or heterocyclic compounds.

[0031]

The present invention will be specifically described below with reference to examples. However, the present invention is not limited to only this embodiment. Example 1 (Sensitive material) White pigment (Ti) was added to polyethylene on the first layer side.
On a paper support laminated on both sides with polyethylene, containing O ₂ ) and a bluish pigment (ultramarine), a multilayer color photographic paper having the following layer constitution was prepared. This is designated as Sample P1. Layer constitution of light-sensitive material First layer (red-sensitive layer) g / m ² Silver chloride emulsion (99.98 mol% AgCl, silver: 0.3 0.02 mol% AgBr) Gelatin 1.86 Yellow coupler (a) 0 .82 Color image stabilizer (b) 0.19 Solvent (c) 0.35 Second layer (color mixture prevention layer) Gelatin 0.99 Color mixture inhibitor (d) 0.08 Third layer (green sensitive layer) Chloride Silver emulsion (99.98 mol% AgCl, silver: 0.36 0.02 mol% AgBr) Gelatin 1.24 Magenta coupler (e) 0.31 Color image stabilizer (f) 0.25 Color image stabilizer (g 0.12 Solvent (h) 0.42 Fourth layer (ultraviolet absorbing layer) Gelatin 1.58 Ultraviolet absorber (i) 0.62 Color mixing inhibitor (j) 0.05 Solvent (k) 0.24 Fifth layer (red-sensitive layer) Silver chloride emulsion (99.98 mol% AgCl, silver: 0.23 0.02 mol% AgBr) Gelatin 1.34 Cyan coupler (l) 0.34 Color image stabilizer (m) 0.17 Polymer (n) 0.40 Solvent (o) 0.23 6th layer (ultraviolet absorbing layer) ) Gelatin 0.53 UV absorber (l) 0.21 Solvent (k) 0.08 7th layer (protective layer) Gelatin 1.33 Acrylic modified copolymer of polyvinyl alcohol 0.17 (degree of modification 17%) Liquid paraffin 0.03 The coating solution used for preparing the above-mentioned multilayer color photographic paper was prepared as follows.

The coating solution for the first layer will be described as an example. First, 29.1 cc of ethyl acetate and 7.7 cc of a solvent (c) are added to 19.1 g of a yellow coupler (a) and 4.4 g of a color image stabilizer (b). Dissolve the solution and add 3 cc of 10% sodium dodecylbenzenesulfonate to 10%
The emulsion was emulsified and dispersed in 185 cc of an aqueous gelatin solution. On the other hand, a silver-sensitive emulsion (99.98 mol% of silver chloride, 0.02 mol% of silver bromide, containing 70 g / Kg of Ag) was mixed with a blue-sensitive spectral sensitizing dye shown below at 5.0 × 10 ^-4 mol per mol of silver. Additions were prepared. The above-mentioned emulsified dispersion and this emulsion were mixed and dissolved to prepare a first layer coating solution having the composition of the first layer shown in the layer constitution of the above-mentioned light-sensitive material.

The coating solutions for the second to seventh layers were prepared in the same manner as the above-mentioned method for preparing the first layer coating solution. As a gelatin hardener for each layer, 1-oxy-3,5-dichloro-S-triazine sodium salt was used. The following were used as the spectral sensitizing dyes in each layer. Addition amount of spectral sensitizing dye (per mol of silver halide) Blue-sensitive emulsion layer D-1 5.0 × 10 ^-4 mol Green-sensitive emulsion layer D-2 4.0 × 10 ^-4 mol and D- ³⁷ 0.0 × 10 ^-5 mol Red-sensitive emulsion layer D-4 0.9 × 10 ^-4 mol The chemical structural formula of the spectral sensitizing dye used here is shown below.

[0034]

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The following compounds were added to the red-sensitive emulsion layer in an amount of 2.6 × 10 ^-3 mol per mol of silver halide.

[0036]

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The blue-sensitive emulsion layer, the green-sensitive emulsion layer and the red-sensitive emulsion layer were treated with 1- (5-methylureidophenyl)-
5-mercaptotetrazole was replaced by silver halide 1
8.5 × 10 ^-5 mol and 7.7 × 10 ^-4 mol were added per mol. Further, the following dyes were added to each emulsion layer to prevent irradiation.

[0038]

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The compounds used for each layer in the above-described layer constitution of the light-sensitive material are shown below.

[0040]

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[0041]

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[0042]

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[0043]

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[0044]

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In the light-sensitive material sample P1 (comparative example) prepared as described above, an antihalation layer (black colloidal silver 0.10 g / g) was provided between the support and the first layer (red-sensitive layer).
m ^2, gelatin 1.5 g / m ²⁾ and the provided to prepare a sample P2 sensitive material according to the present invention. (Processing Step) Each sample of the photosensitive material was cut into an 82.5 mm width, exposed to light by an automatic printer, and processed by an automatic developing machine according to the processing steps shown in Table 1.

[0046]

[Table 1]

In the above processing, the amount of the bleach-fixer brought into the washing was 8 m wide color printing paper 1 m.
2.5 ml per wash, and the replenishment amount of washing water was 6 times the carry-in amount. (Treatment liquid) Each treatment liquid formulation used is as follows. Color Developer A color developer (A) having the following composition was prepared.

Mother liquor replenisher Triethanolamine 8.0 g 10.0 g N, N-diethylhydroxylamine 4.2 g 6.0 g Fluorescent whitening agent (4,4′-diaminostilbene) 3.0 g 4.0 c ethylenediamine Tetraacetic acid 1.0 g 1.5 g Potassium carbonate 30.0 g 30.0 g Sodium chloride 1.4 g 0.1 g 4-amino-3-methyl-N-ethyl-N- 5.0 g 7.0 g {β- (methanesulfone Amido) ethyl} -P-phenylenediamine sulfate Water was added to 1000 ml 1000 ml pH 10.10 10.50 A color developing solution (A) was prepared by adding the chemicals shown in Table 2 below at various concentrations. Color developing solution (B) ~
(G). Bleaching-fixing solution (mother liquor and replenisher are the same) EDTAFe (trivalent) NH ₄ .2H ₂ O 60 g EDTA.2Na.2H ₂ O 4 g Annium thiosulfate (70%) 120 ml Sodium sulfite 16 g Glacial acetic acid 7 g Add water 1000 ml pH 5.5 Rinse water Tap water is replaced with H-type strongly acidic cation exchange resin (Mitsubishi Kasei Co., Ltd.)
Trade name Diaion SK-1B) and OH type strong basic anion exchange resin (Mitsubishi Kasei Co., Ltd., trade name Diaion S
A-10A) and water having the following quality.

PH 6.9 Calcium ion 1.5 mg / l Magnesium ion 0.5 mg / l (Result) The sensitivity, sharpness, and stain of the color photographic paper subjected to the above treatments were measured. Table 2 shows the measurement results. In addition, the measurement result was shown by (circle), (triangle | delta), and x as a relative evaluation. The stain is a χ (average) value of Xwrite n = 6, and the sign B,
G and R represent a green-sensitive emulsion layer, a blue-sensitive emulsion layer and a red-sensitive emulsion layer, respectively.

[0050]

[Table 2]

Since the evaluation of sharpness (sharpness) in the above-described measurement is relative and not sufficient in accuracy, MT by Fourier analysis, which is most widely used today as a method of evaluating sharpness, is used.
F (modulation transfer func)
tion = modulation transfer function) (edited by the Photographic Society of Japan, “Basics of Photographic Engineering-Silver halide photography-”, pp. 416-42)
See page 1.) A sine wave exposure-microphotometer method was used for the measurement. In this measurement, in the experiment no. 1
And No. Each of the processed color photographic papers obtained in step No. 4 was used at a spatial density of about 1.0 at a print density of about 1.0.
The MTF at m was measured. Table 3 shows the measurement results.

[0052]

[Table 3]

According to the measurement results, it is understood that a color photographic print with improved sharpness can be obtained in the present invention. Example 2 A color developing solution was prepared by adding 2-mercaptobenzimidazole at various concentrations to the color developing solution (A) in Example 1, and using the color photographic paper sample P2 of Example 1 to prepare a color developing solution. Except for exposure and treatment with the above color developing solution, the same processing as in Example 1 was carried out, and the relative evaluation of the sharpness of the resulting processed color photographic paper photograph was as follows.

2-mercaptoimidazole concentration 0.01 mM / liter △ 0.03 to 10 mM / liter ○ 100 mM / liter ×

[0055]

According to the method for producing an original chart of the present invention, a photograph having good sharpness can be obtained without lowering sensitivity and gradation and without increasing stain. For this reason, according to the present invention, a high-quality chart for color adjustment of a television image for a high-quality television or an original chart such as a color master for an electrophotographic copying machine or a color master for a silver halide copying machine is provided. You can get things.

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiichi Taguchi 210 Nakanuma, Minamiashigara-shi, Kanagawa Fujisha Shin Film Co., Ltd. (56) References JP-A-63-63034 (JP, A) JP-A-64-73345 (JP, A) JP-A-62-275259 (JP, A) Japanese Utility Model Laid-Open No. 1-115739 (JP, U)

Claims (1)

(57) [Claims] 1. A color printing paper having an antihalation layer containing colloidal silver and an emulsion layer composed of a high silver chloride emulsion on the reflection side of a support is exposed to light and then exposed to a bromide ion of 0.2 m 2.
M / liter to 100 mM / liter and / or thiol-substituted or thione-substituted nitrogen-containing heterocyclic compound 0.0
A method for preparing an original chart, comprising processing with a color developing solution in the presence of 2 mM / liter to 10 mM / liter.