JPH0437744A - Color image forming method - Google Patents

Abstract

PURPOSE:To obtain color images having excellent sharpness by using a color photographic sensitive material contg. water-soluble dyes and having specific properties and exposing this material with the correcting light formed by passing the light from a light source through a light source member including a light quantity correcting means and an optical path regulating means. CONSTITUTION:The color images having the excellent sharpness of the images and the dot reproducibility extremely approximated to the dot reproducibility of printed matter, more particularly the small dot reproducibility nd large dot reproducibility at the time of the exposing using separation halftone originals are obtd. by adjusting the reflecting density at them max. photosensitive wavelength of at least one layer of the silver halide emulsion layers of the color photosensitive material to be used so as to attain >=0.8 with the system of executing the exposing by using the light formed by correcting the light from the light source by the light quantity correcting means and the optical path regulating means. The silver halide color photosensitive material is exemplified by a negative type color photosensitive material, internal latent image type direct positive color photosensitive material, reversal type color photosensitive material, etc. The water-soluble dyes are exemplified by an oxonol dye, cynine dye, merocynine dye, azo dye, anthraquinone dye, arylidene dye, etc.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a final image with improved sharpness and reproducibility in a silver halide color photographic light-sensitive material (hereinafter referred to as a color light-sensitive material).
The present invention relates to an image forming method for forming an image on a transparent original, and particularly relates to an image forming method for creating a color print from a transparent original.

[Background of the invention]

Recently, the usage of color photosensitive materials has been diversified.

For example, there are ways to use it to create business cards and postcards by imprinting characters, or to create color posters and color proofs from transparent originals.

In these applications, it is required that the final image obtained be highly sharp and free of blur in line drawings and characters.

Particularly in the production of color proofs, in order to achieve the purpose of checking whether a printed material with the required color tone and gradation can be obtained from the original halftone film, color printing with faithful reproducibility to the printed material is required. is required.

Color proofing is an alternative process in the printing industry to partially omit or reduce the trial printing process that is performed to check the finished quality of printed matter in advance during the process of producing printed matter from a color original manuscript. Various methods are known for color proofing. The methods include silver halide photography, photopolymer transfer, and toner transfer.
It is commercially available under trade names such as Chromalin (Dupont) and Cromarin (Dupont).

However, the one-transfer system with 7 Otobolima has disadvantages in that the transfer process is complicated, an image cannot be obtained quickly, and the cost is high. The toner transfer method causes toner to scatter, which is unfavorable in terms of environmental hygiene. Silver halide photography does not have these drawbacks and has the advantage of being low cost, easy to work with, and can produce color proofs quickly. The sharpness of the image was insufficient, the reproducibility of highlighted areas of fine text and patterns was poor, and it was difficult to clearly distinguish them from white backgrounds.

In an image forming method in which an image is obtained by exposing and developing a color sensitive material, methods for improving the sharpness of the image include:
The following are known.

(1) Bring the original and photosensitive material into close contact.

(n) Using an emulsion with a high-contrast characteristic curve in the light-sensitive material.

(I[l) Improving the sharpness of light-sensitive materials.

With method (I), it is possible to obtain a sharp image to some extent for an original image that is directly brought into close contact with the photosensitive surface of a photosensitive material, regardless of the light source.

However, in the printing process, a film original of a certain color is often composed of a plurality of overlapping films, and color proofs are also sometimes used in such a process. Furthermore, since the forward and reverse directions of the image differ depending on the process, it may be necessary to expose the original film from the emulsion side and expose the back side in close contact.

When the original image is separated from the photosensitive material in this way, it cannot come into close contact with the photosensitive material, so light is diffused in the film support that exists between the original image and the photosensitive material, resulting in thin lines and highlighted areas. reproducibility deteriorates significantly. In particular, when using ordinary color sensitive materials, image reproduction of fine lines and highlight areas that are not suitable as color proofs even if coated with a silver salt emulsion that has a characteristic curve such as (ff) that is simply high-contrast. All I got was sex.

The following method is known as a method for improving the sharpness of the color photosensitive material (I[[).

(1) Preventing irradiation with water-soluble dyes.

(2) Provide an antihalation layer containing colloidal silver or colloidal manganese.

(3) Increasing the packing density of the white pigment in the polyolefin layer of a reflective support in which a base paper is laminated with polyolefins.

(4) Thinning the photographic constituent layer containing hydrophilic colloid.

(5) A photographic constituent layer contains a compound that releases a development inhibiting compound during development.

Method (1) is also used in commercially available color photosensitive materials for printing, but since the purpose of general photosensitive materials is to reproduce halftone images, the content of water-soluble dyes is low. , each reflection density of each image forming layer at the maximum photosensitive wavelength of the color sensitive material before development is less than 0.5. For this reason, a faithful color proof with sufficient sharpness cannot be obtained.

With method (2), there is staining due to poor bleach-fixing of colloidal silver and deterioration of the white background due to fogging of silver halide, and images with poor color balance as a color proof due to significant softening of photographic gradation. I can only get it. Regarding this problem, Japanese Patent Application Laid-Open No. 63-6303
No. 4 proposed the regulation of the ratio of gelatin and colloidal silver in the antihalation/con layer and the adjacent auxiliary layer, and Japanese Patent Application Laid-open No. 63-63040 proposed the regulation of the thickness of the antihalation layer, but no satisfactory effect was obtained. I can't.

Regarding (3), please refer to JP-A No. 61-284763 and JP-A-61-284763.
Although it is described in No. 1-270749 and No. 61-270750, an image that is satisfactory as a color proof cannot be obtained.

Regarding (4), there is a limit to how thin the photographic constituent layer can be made, and the effect is small.

Regarding (5), the edge effect is emphasized at low spatial frequencies, but an image that is satisfactory as a color proof cannot be obtained.

Furthermore, in either method, if a black-and-white halftone separation film is used as the original film, it is not possible to obtain halftone dot gradation reproducibility similar to that of printed matter.

In addition, as a light source member for exposing light through such a transparent original, a slide group that projects a projection image onto the document table of the device is used to copy various projection originals such as slides, negative films, and microfilms. 2. Description of the Related Art Various types of document projection devices including a projector, a reflecting member, an image forming member, etc. have been proposed.

Various types of transparent original light source devices have also been proposed for copying transparent originals by placing various transparent originals directly on the document table of a copying device.

Such a transparent original light source device usually includes a light source for irradiating the transparent original, and a glue flap or the like for reflecting the irradiation light emitted from the light source onto the transparent original.

When copying a transparent original using such a transparent original light source device, the transparent original is placed on the document table of the copying device, and the transparent original is irradiated by the irradiated light from the light source or from the irradiated light from the light source and the reflector. The transparent original is irradiated with the reflected light. A photosensitive material or the like is then exposed to the transmitted light that has passed through the transparent original to obtain a copy image of the transparent original.

By the way, in such a transparent original light source device, the amount of light irradiated from the light source decreases from the center of the light source toward the periphery, and the amount of light is not uniform over the entire exposure surface of the copying device. The drawback is that differences in reproducibility occur due to differences in light intensity. In particular, when a fluorescent lamp is used as a light source, there is considerable unevenness in the light intensity distribution even within the same light source due to not only the difference in light intensity between the center and the periphery, but also due to uneven distribution and vibration of the fluorescent material.

On the other hand, various printers are widely used in the printing industry as a method of regulating the optical path of light that exposes photosensitive materials. Is it known whether there is a distance from a point light source, etc., or when exposing a sensitive material, such as the single-layer color sensitive material mentioned above, whose reflection density before development processing is lower than 08 at the maximum sensitivity wavelength of the silver halide emulsion layer? Even in this case, halftone dot reproducibility with improved sharpness suitable for color proofing could not be obtained.

[Purpose of the invention]

Therefore, it is an object of the present invention to eliminate deterioration of white background and photographic gradation.
An object of the present invention is to provide a method for obtaining a color image with excellent sharpness using a color sensitive material with greatly improved sharpness and gradation reproducibility. In particular, it is an object of the present invention to provide a method for obtaining a color image having faithful halftone dot reproducibility suitable for creating a color blueprint.

[Structure of the invention]

An object of the present invention is to provide a silver halide color photographic light-sensitive material having a photographic constituent layer including at least a blue-sensitive silver halide emulsion layer, a green-sensitive silver halide emulsion layer, and a red-sensitive silver halide emulsion layer on a reflective support. In an image forming method for obtaining a color image by exposing light through a transparent original, the exposure is corrected light by passing light from a light source through a light source member including a light amount correcting means and an optical path regulating means, and the color photographic light-sensitive material is At least one of the photographic constituent layers contains a water-soluble dye, and at least one of the silver halide emulsion layers has a reflection density of 0.8 or more before development at the maximum photosensitive wavelength. This is achieved by a color image forming method characterized by the following.

In addition, for the reflection density in the present invention, the sample was manufactured by Hitachi, Ltd.
These values were measured using a Color Analyzer Model 607 manufactured by Kawasaki.

The present invention will be explained in more detail below.

In the present invention, the halftone reproducibility refers to the value converted from the density to the halftone percentage using the Murray-Devis formula, and the density is usually measured using a densitometer and a light source filter with a complementary color to the color of the object to be measured. It means the value obtained by converting the obtained concentration value using the following formula.

Dtz Density of the halftone area Ds: Density of the solid area (both values when the fog density is 0) When the halftone % calculated by this formula is plotted against the original halftone % of the separated mesh original, in the case of a printed matter, it is usually It shows an arc-shaped reproduction curve that is thicker than the original dot percentage. This is generally called dot gain, and the balance between the size of this dot gain amount and the dot gain amount of each color is extremely important for printed materials, and it is necessary to accurately trace the dot gain of printed materials as a proof material that can be used as a substitute for printed materials.

The present invention corrects light from a light source using a light amount correcting means and an optical path regulating means. In a system that performs exposure using light,
By adjusting the reflection density of at least one silver halide emulsion layer of the color sensitive material used so that the reflection density at the maximum exposure wavelength is 0.8 or more, the sharpness of the image is excellent, and it is possible to use a resolution mesh original. When exposed to light, it became possible to obtain a color image with excellent halftone dot reproducibility, especially small dot reproducibility and flash point reproducibility, which was extremely similar to that of printed matter.

Examples of the silver halide color photosensitive material used in the present invention include negative color photosensitive materials, internal temperature type direct positive color photosensitive materials, and reversal color photosensitive materials. There are two types of internal temperature type direct positive color photosensitive materials: photofogging type and chemical fogging type, and either type is acceptable.

Examples of water-soluble dyes contained in the photographic constituent layers of the color light-sensitive material used in the present invention include oxonol dyes, cyanine dyes, merocyanine dyes, azo dyes, anthraquinone dyes, and arylidene dyes. Particularly preferred dyes are oxonol dyes and melonanine dyes in terms of high decomposability and non-color sensitization of silver halide emulsions.

As an oxonol dye, U.S. Patent No. 4.187.22
No. 5, JP-A No. 48-42826, No. 49-5125, No. 49-99620, No. 50-91627, No. 5
No. 1-77327, No. 55-120660, No. 58-
No. 24139, No. 58-143342, No. 59-38
No. 742, No. 59-111640, No. 59-1116
No. 41, No. 59-168438, No. 60-21864
No. 1, No. 62-31916, No. 62-66275,
No. 62-66276, No. 62-185755, No. 6
It is described in No. 2-273527, No. 63-139949, etc. As a melon anine dye, JP-A-50-
No. 145124, No. 58120245, No. 63-35
No. 437, No. 63-35438, No. 63-34539
No. 63-58437, etc.

Typical specific examples of oxonol dyes and melonanine dyes are shown below, but are not limited thereto.

(Water-soluble yellow dye) IY-3 IY-4 A I Y-1 IY-5 IY-2 tJ3b! 1tJ, b IY IY-7 IY IY IY IY IY-9 IY IY (Water-soluble magenta dye) IM-1 IM IM AIM-4 AIM-5 AIM-6 AIM AIM-11 AIM-12 SCl2 to Cori 38 AIM- 7 AIM AIM AIM IM (Water-soluble Noan dye) IC StJ, IC IC-3 IC-4 KIJ3) IC IC-9 IC IC IC IC-7 IC NC IC S[J, AlC-14 AIY-17 Next Although typical examples of water-soluble dyes other than oxonol dyes and merocyanine dyes are shown below, the present invention is not limited thereto.

AIY-15 AIY-18 IM-15 AIY-16 IM-16 IM IC IM-18 IC IC-15 The amount of water-soluble dye used in the present invention is determined by at least It is added in such an amount that the reflection density at one maximum photosensitive wavelength is 0.8 or more. The reflection densities preferably range from 0.9 to 1.2 in each case. It is also necessary that the reflection density at at least one maximum sensitivity wavelength is 0.8 or more, and this maximum sensitivity NI'I2 light wavelength is preferably the reflection density at the maximum wavelength required for magenta or cyan color development. More preferably, the reflection density at the two maximum wavelengths is 0.8 or more. In particular, the wavelength density of the three maximum wavelengths, including the yellow coloring layer, is 0.
Most preferably it is 8 or more.

The water-soluble dye in the present invention is contained in a photosensitive silver halide emulsion layer and/or a non-photosensitive layer.

The water-soluble dye of the present invention is used in combination of yellow, magenta, and cyan water-soluble dyes, and each of the yellow, magenta, and cyan water-soluble dyes may be used alone or in combination of two or more.

In the silver halide emulsion used in the present invention, any silver halide can be used, such as silver bromide, silver iodobromide, silver iodochloride, silver chlorobromide, silver chloroiodobromide, and silver chloride. can.

The method for forming silver halide grains may be any of the acid method, neutral method, and ammonia method, and methods known in the photographic field such as the simultaneous mixing method, forward mixing method, back mixing method, and funversion method are used. .

The silver halide grains may have a regular crystal shape such as a cube, octahedron, or dodecahedron, or may have an irregular crystal shape such as a spherical shape or a plate shape. Further, the particles may have a composite form of these crystal forms, or particles of various crystal forms may be mixed.

Silver halide emulsions can be used either with a wide grain size distribution (polydisperse emulsion) or with a narrow grain size distribution (monodisperse emulsion), but preferably a monodisperse emulsion (with a standard grain size distribution). deviation/average particle size = coefficient of variation 0.20 or less)
It is. The particle size is preferably 0.1-1.0 μm.

Silver halide emulsions can be chemically sensitized (for example, sulfur sensitization, gold sensitization, selenium sensitization, reduction sensitization) and spectral sensitization (for example, cyanine dyes, merocyanine dyes, hemicyanine dyes, styryl dyes, Spectral sensitization using hemioxonol dyes) is possible. Also, fog suppressants or stabilizers known in the art (eg, azaindenes, mercapto heterocycles) can be added.

The emulsion layer of the photosensitive material contains a diffusion-resistant material that forms a dye by coupling with an oxidized form of an aromatic primary amine compound (e.g., p-) unilene diamine derivative or amine/phenol m4 compound) during color development processing. sexual couplers are used.

As the yellow dye-forming coupler, annulacetanilide couplers can be used, and among these, benzoylacetanilide and pivaloylacetanilide compounds are preferred. Specific examples of yellow couplers include, for example, U.S. Pat.
．． No. 506, No. 3,408,194, No. 3, 551.
No. 155, No. 3,891.445, Japanese Unexamined Patent Publication No. 1973-73
Examples include couplers described in No. 147, No. 50-6341, No. 52-21827, No. 52-115219, and No. 58-95346.

As the magenta dye-forming coupler, 5-pyrazolone type, pyrazoloazole type, pyrazolinobenzimidazole type, indasilone type, open chain acylacetonitrile type coupler, etc. can be used, and these are described, for example, in US Pat. No. 2,600.788. No. 3,062゜653, No. 3
．． No. 152.896, No. 3,558,318, No. 3,
930゜866, JP-A-49-29639, JP-A No. 50
-13041 etc.

As the dye-forming coupler, a phenol or a 7-tole coupler is generally used. these/
Uncouplers include, for example, U.S. Patent No. 2.369,992, U.S. Pat.
3,034.892, 3,839,044, JP-A-47-3742, 50-112038, 5
0-130441 etc.

A benzophenone-based or benzotriazole-based ultraviolet absorber may be added to the photosensitive material.

Particularly preferred are benzotriazole compounds, such as U.S. Patent No. 3,754,919, U.S. Pat.
Those described in No. 1572 and the like can be used.

Hydrophobic compounds, such as the dye-forming couplers and UV absorbers mentioned above, are usually combined with high boiling organic solvents (e.g. phthalates, phosphates, phenol derivatives, alkylamides, cycloalkanes), optionally with low boiling points, and It is used by dissolving it in combination with/or a water-soluble organic solvent and emulsifying and dispersing it in a binder using a surfactant.

The binder used in the photographic constituent layer of the present invention includes:
Gelatin, albumin, agar, gum arabic, partially hydrolyzed polyvinyl acetate, polyacrylamide, etc. can be used, and gelatin is particularly preferred.

The emulsion layer and auxiliary layer on the emulsion side may contain various photographic additives. For example, color image stabilizers, color stain preventive agents, optical brighteners, antistatic agents, hardeners, as described in Research Disclosure No. 17543,
Surfactants, plasticizers, wetting agents, etc. can be used as appropriate.

As a coating method for the emulsion layer and the constituent layers, slide hopper coating, curtain coating, air doctor coating, etc. are useful, but simultaneous multilayer coating using a slide dropper is particularly preferred.

The reflective support of the present invention is made by laminating a thermoplastic resin such as polyolefin (e.g. polyethylene, polypropylene) containing a white pigment on both sides of a base paper.
Rc base paper), baryta paper, plastic film containing white pigment, etc., especially those with a thickness of 100 to 1
50 μm RCf paper is preferred.

As the light source used in the exposure of the present invention, various kinds of light sources can be used, such as a rod-shaped light source in which a large number of short filaments are arranged in the longitudinal direction, a point light source in which a plurality of single filament point light sources are arranged. That is, there is no particular restriction as long as it has a light amount that can expose the photosensitive material etc. on the exposure surface, and various types of light such as natural light, tungsten electric lamps, fluorescent lamps, mercury lamps, halogen electric lamps, xenon electric lamps, etc. can be used.

The light amount correcting means used in the present invention is for making the light amount of the light source uniform over the entire exposed surface.

Specifically, white acrylic board, frosted glass, white glass,
Examples include various diffusion plates such as diffusion sheets.

These various diffuser plates have transmittances of 55% or more and 95%
It is preferable that it is below. If the transmittance is higher than that, the light amount correction effect will be low, and even the obtained image will suffer from image deterioration due to light amount unevenness.

Those with a lower transmittance have a high light amount correction effect, but have the disadvantage that the amount of light effective for exposure decreases and the exposure time becomes longer. In particular, when silver halide photosensitive materials are exposed to low-intensity light for long periods of time, development called low-intensity failure occurs.
The resulting final image may be fogged or deteriorated due to softening of the tone.

In addition to the diffuser plate, various light amount correction filters, masks, etc. can also be used in combination. These can have an achromatic color density distribution depending on the light intensity distribution of the light source.

These light amount correction means are arranged between the light source and the document. It is preferably inserted between the light source and the optical path regulating means, but in some cases it may be inserted between the optical path regulating means and the document to correct unevenness caused by the optical path regulating means.

The optical path regulating means used in the present invention is a means for regulating the light from the light source into parallel light, and includes, for example, a method of measuring distance using a point light source, insertion of a honeycomb board, a cell-hoc lens, a fiber array, a Fresnel lens, etc. etc.

Among them, honeycomb boards, cell-hook lenses, fiber arrays, etc. are effective because they make the device compact.

In particular, in the case of honeycomb boards, the parallelism of the exposure light obtained changes depending on the thickness and diameter of the honeycomb, so care must be taken to use a board with an appropriate diameter and thickness.

The term "parallel light" used in the present invention refers to light having a maximum incident angle of 70 degrees or more, more preferably 76 degrees or more.

Especially when stacking two sheets of original film or exposing from the back side of the emulsion, the parallelism of the light affects halftone dot reproducibility, especially reproducibility of small dots and large dots.
The light source member used in the present invention, which is particularly preferably as described above, can incorporate other means depending on the purpose. For example, when obtaining a color proof from a transparent color separation dot original, since the original is a colorless film, it is necessary to incorporate a color separation filter to obtain the exposure wavelength corresponding to each layer. In addition, in order to make more effective use of the amount of light from the light source, a reflection means can be placed behind the light source.The reflection means is emitted behind the light source, that is, toward the opposite side from the transparent original. This is a member for reflecting irradiated light to the transparent original side and improving light collection efficiency.

The shape of the reflecting means is not particularly limited as long as it can appropriately reflect the irradiated light from the light source onto the transparent original. Therefore, its shape is appropriately determined depending on the size of the light source member to which it is applied, the shape and number of light sources, the amount of light, the distribution of light amount, etc., and the image forming apparatus to which it is applied.

Further, there is no particular restriction on the material, and any material used for normal glue flapers, such as aluminum or those materials subjected to surface treatment to increase light reflection, can be used.

The exposure method of the present invention can be either static exposure or scanning exposure.

In the present invention, the original and the color photosensitive material do not necessarily have to be in direct contact with each other, but if the transparent original or the color photosensitive material has curls or curls caused by the nature of the original support, the image will be distorted at the center and edges of the original. The reproducibility is different, and images cannot be distinguished, especially in areas where the contact between the original and the color photosensitive material is poor.

For this reason, it is preferable that the transparent original and the color photosensitive material are pressed and brought into close contact with each other using a contact aiding means such as a cover sheet or transparent glass. Particularly preferred is vacuum contact.

The color development process in the present invention is usually carried out in the order of a color development step, a bleach-fixing step, a water washing step, or a stabilization step known in the photographic industry.

In addition, for direct positive color photosensitive materials, in addition to the above methods, there are also reversal processing methods such as fogging processing, and for reversal color photosensitive materials, a positive image can be obtained by combining with the first monochrome development processing.

Aromatic primary amines are typical color developing agents for the color sensitive material of the present invention, and known alkaline agents, preservatives, antifoggants, optical brighteners, etc. are used in the color developing solution. be able to. Known bleaching agents and fixing agents can be used in the bleach-fixing solution.

Although the present invention is particularly effective for creating a color proof on a color photosensitive material through a transparent halftone original, it can also be used when copying transparent originals such as color negatives, slides, OHP, etc. onto color photosensitive materials. Of course you can.

〔Example〕

EXAMPLES The present invention will be explained in detail by examples below, but the present invention is not limited to the examples.

Example 1 A negative color photosensitive material for color proofing was prepared by coating a photographic constituent layer as described below on a 135 μm thick Rc base paper as a reflective support. Incidentally, unless otherwise specified, the amount added refers to the amount applied per 1 m2 of photosensitive material.

(Photographic constituent layers) Layer 1: Blue-sensitive emulsion layer A monodisperse (coefficient of variation 0.18) silver chlorobromide emulsion (silver chloride 5 0.34g yellow coupler (Y-1) 0.9g gelatin
1.6g layer 2: first intermediate layer 2.5-di[-octylhydroquinone 0.05g gelatin l, 0g layer 3: green-sensitive emulsion layer Spectral sensitization with sensitizing dye (D-2) and sulfur sensitization. The monodisperse (coefficient of variation 0.18) silver chlorobromide emulsion (containing 15 mol% silver chloride) is converted into silver: 0.29 g magenta coupler (M -1) 0.36 g gelatin
1.4g Layer 4: Second intermediate layer ultraviolet absorber (UV-1) 0.3g2.5
-G-L-octylhydroquinone 0.05g Gelatin 1.4g Layer 5: Red-sensitive layer Emulsion layer Spectrally sensitized with sensitizing dye (D-3), sulfur-sensitized, monodisperse (coefficient of variation 0.18) Silver chlorobromide emulsion (silver chloride 15
0.22g cyan coupler C-1 0.14g cyan coupler (c-2) 0.28g Q gelatin 1.5g Layer 6: First protective layer Ultraviolet absorber (UV- (2) 0.7 g Gelatin 0.6 g Q Layer 7: Second protective layer gelatin 0.9 g Surfactant S22 and hardener H-1 were used as coating aids.

(Used I; additive) R 2H5 CH2C00CH2CHC, Hl CH2COOCH2(CF2CF2)2HNa The layer shown in the photo above shows Added the water-soluble dye shown in added.

Table 1 The measurement of 1 degree of reflection was performed using a Color Analyzer Type 607 manufactured by Hitachi, Ltd.

shizlis (I'12)3:)lJ3= Regarding the sample obtained as above, The following places I gave it a try.

(Exposure method) A transmission black-and-white dot image film with a variable area ratio of 150 lines/inch was used as the original, and the original was vacuum-adhered to a photosensitive material. Rayon Acrylite@N09432 (a diffuser plate with a transmittance of 76%) was used for color-separate exposure with the exposure light corrected by inserting a honeycomb board as an optical path regulating means.

A halogen lamp was used as the light source, and a Kodak Wratten filter No. 47B (blue) was used as the color separation filter.
, No. 61 (green) and No. 29 (red) were used.

The exposure time was set so that the color image obtained after development had a solid area reflection density of 100% for yellow, magenta, and cyan, respectively, of 1.8 to 1.9.

Exposure was carried out both when the emulsion side of the film original and the photosensitive layer side of the photosensitive material were brought into close contact, and when the back side of the original and the photosensitive layer side of the photosensitive material were brought into close contact.

(Development processing method) Color development Bleaching Fixing Stabilization Drying Dry color developer composition N-ethyl-N-β-3-methyl-4-aminoaniline sulfate methanesulfonamide ethyl 38°C 33°C 33°C 70°C 2 minutes 45 seconds 1 minute 30 seconds 1 minute 4.5g 2.0g 25.0g 0.1g 0.2g 2.0g 10.0+nf2 Hydroxylamine sulfate potassium carbonate sodium chloride sodium bromide anhydrous sodium sulfite benzyl using sodium hydroxide Add alcoholic water to make the solution 112, and adjust the pH to 10.15.

Bleach-fix solution composition Ethylene diamine sodium salt iron tetraacetate (I [

Stabilizing liquid 5-chloro-2-methyl-4-inthiazolin-3-one 1.0 g Ethylene glycol 1. ogl-hydroxyethylidene-1,1-diphosphonic acid 2.0 g ethylenediaminetetraacetic acid @l, 0 g ammonium hydroxide (20% aqueous solution) 3.0 g ammonium sulfite 3.0 g optical brightener (4,4'-diaminostilbendisulfone acid derivatives)
Add 1.5 g of water to make the solution 112, and adjust the pH to -7.0 with sulfuric acid or potassium hydroxide.

The following evaluations were performed on the treated samples.

(Evaluation Items) (1) Amount of Dot Gain The density of each halftone image of a yellow image, a magenta image, and a cyan image was measured, and the amount of dot gain was determined using the following formula and the halftone reproducibility was evaluated.

D [: Density of mesh portion (value when fog density is 0) Ds,
Density of solid area (value when fog density is 0) Dot gain amount - D (%) - D, (%) Do: Original halftone dot area (2) Large dot area reproducibility 90 to 99% of the original (large dot The reproducibility of part) was visually evaluated.

(3) Image quality evaluation Based on the results of (1) and (2), the color image quality of the halftone image was evaluated as follows.

○...Color image with halftone image quality matching the printed matter △...Color image X whose balance is shifted from the printed matter
...Color images Δ and X, in which the large dots are crushed and the small dot reproduction is poor compared to the printed matter, are images that do not reach the target.

Example 2 Equimolar silver nitrate aqueous solution and potassium bromide aqueous solution were simultaneously added to gelatin aqueous solution at 50'C for about 50 minutes by double jet method to form cubic silver bromide particles with an average particle size of 0.3 μm. An emulsion was obtained. To this emulsion, a silver nitrate aqueous solution and a sodium chloride/potassium bromide mixed aqueous solution (molar ratio 1:1) were added simultaneously to obtain an average grain size of 0.45.
A cubic core/shell type emulsion (EM-1) consisting of a micrometer silver bromide core and a silver chlorobromide core was prepared.

RD-1, RD- suitable for each photosensitive layer of the above emulsion
2. After spectral sensitization by adding sensitizing dyes GD-1 and BD-1, each layer of the formulation shown in Table 3 below was coated to add a positive silver halide color book for the sample. Amounts are based on silver equivalent.

BD CH2C00H (CH2)xsOsθ C o-1 c, H+y(n) The above photographic constituent layer has a surface. Add the water-soluble dye shown in 4. In addition, Sample sensitive material 3.

4 was produced.

D S ○ [JH S H ST-3 ST-4 V-2 Color photographic paper was produced by coating the first to ninth layers on the surface of a support laminated with polyethylene on both sides in the composition shown in Table 3. . S-1 and s are used as coating aids at this time.
-2 was used, and H-1 and H-2 were used as hardeners.
was used.

(iE! Optical Method Color-separate exposure was carried out in the same manner as in Example-■, except that Mitsubishi Rayon Acrylite No. 422 (transmittance 56%) was used as the diffuser plate as the amount correction means.

However, the exposure time is yellow magenta after development processing,
The time was set to provide the minimum exposure amount at which each density of the cyan non-image area was minimized.

(Development processing method) These exposed samples were processed through the following processing steps.

Processing process (processing temperature and processing time) (1) Immersion (color developer) at 38°C for 8 seconds (2) Fog exposure for 10 seconds at -1lux (3) Color development at 38°C for 2 minutes (4) Bleach fixing
35°C 60 seconds (5) Stabilization treatment 25-30°C
(6) Drying 75-80°C Processing solution composition (color developer) Benzyl alcohol CezC5O4)s Ethylene glycol Potassium sulfite Potassium bromide Sodium chloride Potassium carbonate ST-4 Hydroxylamine sulfate Polyphosphorus @ (TPPS) N-ethyl -N-β-Hydroxybutyl-2-diamine sulfate Fluorescent brightener (4,4'-diaminostilbendisulfonic acid derivative) Potassium hydroxide diethylene glycol 1 minute 30 seconds 1 minute 15 m (10,015g mQ 2.5g o , 8g 0.2g 25,'Og O,1g 5.0g g Phenyl 5.0g 1.0g 2.0g 5mff Add water to bring the total amount to 1a, and adjust the pH to 10.20.

(Bleach-fix solution) Ferric ammonium ethylenediaminetetraacetic acid dihydrate 60g ethylenediaminetetraacetic acid 3g ammonium thiosulfate (70% solution) loOmQ ammonium sulfite (40% solution) 27.5mQ Adjust to pH 7.1 with potassium carbonate or glacial acetic acid. Add water to bring the total volume to 1ρ.

(Stabilizing liquid) 5-chloro-2-methyl-4-inthiazolin-3-one 1.0 g Ethylene glycol 10 g 1-Hydroquinethylidene-11 monodiphosphonic acid 2.5 g Bismuth chloride 0.2 g Magnesium chloride 0.1 g Water Ammonium oxide (28% aqueous solution) 2.0g Sodium nitrilotriacetate 1.0g Add water to bring the total volume to la
and pH 7.0 with ammonium hydroxide or vLIW.
Adjust to.

Note that the stabilization treatment was performed using a countercurrent method with a two-tank configuration.

(Evaluation item) (1) Dot gain amount It was carried out in the same manner as in Example-1.

(2) Small point reproducibility The reproducibility of 1 to 10% (small dot S) of the manuscript was visually evaluated.

(3) Image quality evaluation Based on the results of (1) and (2), evaluation was made in the same manner as in Example-I.

As is clear from the results shown in Table-2 and Table-5,
When the light-sensitive material according to the present invention is used and the exposure according to the present invention is carried out, an image having extremely excellent halftone dot reproducibility can be obtained.

Example-3 Polyethylene laminated paper support on both sides (thickness 10
A color photographic material was prepared by coating a color photographic material in which the 1st to 10th layers shown in Table 6 below were coated on the front side and the 11th to 12th layers were coated on the back side. The first IW coated side of the polyethylene contains titanium white as a white pigment.

In the table, the coating amount is shown in units of g/m2. Regarding silver halide, the coating amount is shown in terms of silver. The emulsion used in each layer was prepared according to the manufacturing method of emulsion EMI.

However, the emulsion of the 11th layer was a ring whose surface was not chemically sensitized.The water-soluble dyes shown in Table 7 were added to the above photographic constituent layers to prepare sample sensitive materials -5 and -6.

Preparation of Emulsion EMI While vigorously stirring an aqueous gelatin solution and keeping it at 75°C, an aqueous solution of potassium bromide and an aqueous solution of silver nitrate were simultaneously added over a period of 15 minutes to obtain octahedral bromide with an average particle size of 0.21 microns. Silver particles were obtained. To this emulsion, 1 g of 3,4-dimethyl-1,3-thiazoline-2 was added per mole of silver.
Chemical sensitization was carried out by sequentially adding thione, 4ff1g of sodium thiosulfate, and 7mg of chloroauric acid (tetrahydrate) and heating at 75°C for 25 minutes. The obtained particles were used as cores and further grown under the same particle growth conditions as the first time.
Finally, an octahedral monodisperse core/7L silver bromide emulsion with an average grain size of 0.45 microns was obtained.

The variation in grain size was 10%.This emulsion was chemically amplified by adding 1.5 mg of sodium thiosulfate and 1.5 mg of chloroauric acid (tetrahydrate) per mole of silver and heating at 60°C for 45 minutes. Sensitive processing is performed to create an internal latent image type silver halogen emulsion.
Gain! Two.

In each photosensitive layer, FA-1 and FA2 were added as fogging agents at 2.0% per 1 mole of silver halide, respectively. OX'Q-6 mol,
Also, 4.5X each of Kafuri inhibitors 5T-5 and 5T-6
10-'mol was added.

Each spectrally sensitized silver halide emulsion has a coefficient of variation of 0.
08-0. A monodisperse emulsion of lO was used. -1D D V A ○ A ○ O3H D-6 v V S A, S ■ ■ (CH,), So, ni (CH:)lsO3K ■ I C V U ■ C C O ■ O O A-1 1, A mixture of 2-bis(vinylsulfonylacetamido)ethane and 2,5.6-trichloro-1,3,5-triazine in a molar ratio of 1.1.

A A Shit12 I-Sire (Exposure method) Color separation exposure was performed in the same manner as in Example-1.

However, the exposure time is for yellow, macenta, and
The time was set to provide the minimum exposure amount to minimize each density of the non-image area of 7 am.

(Development processing method) These exposed samples were processed through the following processing steps.

Processing process (processing temperature and processing time) Color development Bleach fixing at 38°C for 130 seconds Washing with water for 40 seconds at 35°C (1)
Wash at 33°C for 40 seconds (2) 33
Washing with water at °C for 40 seconds (3) Drying at 33 °C for 15 seconds Processing at 80 °C for 30 seconds Processing solution composition Color developer Ethylene diamine tetrachloride 0.5 g Diethylene glycol smethylenephosphonate lOml Benzyl alcohol 12.0ml Potassium bromide 0.65g Sodium sulfite 2 .4g N,N-diethylhydroxylamine 4.0g triethylenediamine (l
, 4-diazabicyclo(2,2,2'l octane)
4.0 g N-ethyl-N-(β-methanesulfonamidoethyl)-3-methylaniline sulfate 5.6 g Potassium carbonate 2
7-0g optical brightener (diaminostilbene type) 1.0g Add water to 1000mlp
100°C) 10.5
0 Bleach-fix solution Ethylenediamine tetraacetic acid, disodium dihydrate
4.0g ethylenediaminetetraacetic acid・
Fe(I [[) Ammonium dihydrate 46.0g Ammonium thiosulfate 55ml (700g/1) Sodium p-toluenesulfinate 20.0g Sodium bisulfite 12.0g Ammonium bromide 50.0g Ammonium nitrate 30.0g Water t Kaete looOm
l p) I (25°C) 6・20 Stabilizing liquid Tap water was mixed with an H-type strongly acidic cation exchange resin (Amberlite IR-120B manufactured by Rohm and Haas) and an OH-type anion exchange resin (Amberlite + R- Water was passed through a mixed bed column packed with 400) to reduce the concentration of Cal/Ram and magnesium ions to 3 mg/l or less, and then 20 mg/l of sodium dichloride and 1.5 g/l of sodium sulfate were added. did. The pH of this liquid is 6.5
It was in the range of ~7.5.

Note that the stabilization treatment was performed using a countercurrent method with a two-tank configuration.

(Evaluation item) (1) Tonto gain amount It was carried out in the same manner as in Example-1.

(2) Small point reproducibility The reproducibility of 1 to 5% (small dots) of the manuscript was visually evaluated.

(3) Image quality evaluation Based on the results of (1) and (2), evaluation was made in the same manner as in Example-1.

Example-4 For the photosensitive material used in Example-3, a fluorescent lamp was used as a light source and Mitsubishi Rayon Acrylide ■N was used as a light amount correction means.
The same procedure as in Example 3 was carried out except that the scanning exposure was carried out through a slit using a cell-hoc lens as an optical path regulating means.

Note that the color separation filter is used by sandwiching it between the diffuser plates.

Example-5 (Exposure method) White fluorescent lamp (40W) as light source for sensitive material 2.4.6 As light amount correction means ■ Rayon acrylic plate with transmittance of 50% ■ Rayon acrylic plate with transmittance of 76% ■ Transmission Rayon acrylic board with a 98% ratio A honeycomb board was used as an optical path regulating means, and the corrected light was scanned and exposed through a slit.The original was transparent, with areas where the area ratio was changed at 150 lines/inch, blank areas, and solid areas. The emulsion side of the original was vacuum-adhered to a light-sensitive material using a black-and-white dot film.

Kodak Wratten Filter N as a color separation filter
o, 47B (blue), No. 61 (green), No.
29 (red) was used.

For photosensitive material-2, the exposure time is determined by whether the color image obtained after development is yellow, magenta, or cyan halftone dot area is 100.
Conditions were set so that the solid area reflection density in % was 1.8 to 1.9, respectively, and for photosensitive materials -5: and 6, the non-image areas of yellow, magenta, and 7 am after development were The time was set to give each density or the minimum exposure amount.

(Development processing method) Development processing was performed using a method suitable for each photosensitive material.

(Evaluation Items) Among the final images obtained from each photosensitive material, the following items were evaluated near the center of the light source and near the edges.

(1) White background density Measurements were made at 5 points using white light, and the average value was determined.

(2) Solid Density The reflection density of the solid part of magenta was measured at five points using green light, and the average value was determined.

(3) Image Evaluation The color image quality of the halftone dot image was evaluated in the same manner as in Example-1.

The results are shown in Table-10. , 4, below margin -1, τ2.

〔Effect of the invention〕

As described above, at least one of the photographic constituent layers constituting the color light-sensitive material contains a water-soluble dye, and at least one of the silver halide emulsion layers has a reflection density of 0 at the maximum photosensitive wavelength before processing. In an image forming method for obtaining a color image from a film original, by combining a color photosensitive material with a color density of . An image with approximate halftone dot reproducibility is obtained.

Furthermore, when producing a color proof using an original made up of a plurality of films, extremely excellent halftone dot reproducibility can be obtained not only in close contact but also in an exposure system where the original and the photosensitive material are separated.

Claims (1)

[Claims] at least a blue-sensitive silver halide emulsion layer on the reflective support;
In an image forming method in which a color image is obtained by exposing a silver halide color photographic light-sensitive material having photographic constituent layers including a green-sensitive silver halide emulsion layer and a red-sensitive silver halide emulsion layer to light through a transparent original, the exposure is from a light source. The color photographic light-sensitive material contains a water-soluble dye in at least one of the photographic constituent layers, and the halogen A method for forming a color image, characterized in that the color photographic material has a reflection density of 0.8 or more before development at the maximum photosensitive wavelength of at least one of the silveride emulsion layers.