JPH0437743A - Color image forming method - Google Patents

Abstract

PURPOSE:To obtain the color images having faithful dot reproducibility of good sharp ness, color balance and the hues approximate to the hues of printing image as a color proof by executing full-surface exposing by using a color photographic materil having the photographic gradation in leg parts of a specific value or above and using color compensation filters with exposing light which is collimated beams of light. CONSTITUTION:The images having the excellent sharpness and the dot reproducibility and color tones extremely approximate to the dot reproducibility and color tones of printed matter are obtd. in the image forming method which obtains the color images from the film original by combining the color photosensitive material having >=1.7 at least one of the photographic gradation in the leg parts of yellow, magenta and cyan images and respectively within + or -7% balance of the photographic gradation in the leg parts and the collimated beams of light with the full-surface exposing via the color compensation filters. Further, the extremely outstanding dot reproducibility and color tones are obtd. even with the exposing system in which the originals and the photosensitive material re not only in tight contact with each other but also apart from each other at the time of producing the color proof by using the originals consti tuted of plural films.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention utilizes a silver halide color photographic material (hereinafter referred to as a color photosensitive material) to produce a final image with improved sharpness and halftone reproducibility. The present invention relates to a color image forming method suitable for creating a color proof from a transmission black-and-white dot image color-separated from a color original document.

[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.

In addition, in particular, in order to check whether the printed material has the desired color tone and gradation from the original halftone film for color proofing, we check the halftone reproducibility and dot density that are faithful to the printed material, and the color tone similar to that of the printing paper. is required.

Color proofing is an alternative process in the printing industry to omit or reduce some of the test printing processes in the process of producing printed matter from color original manuscripts. Various methods are known for color proofing, including silver salt method, 7
There are Otopolymer transfer methods, toner transfer methods, etc., and these are commercially available under product names such as Consensus (Konica), Color Art (Fuji Photo Film), Matsushi Print (3M), and Cromarin (Dupont). has been done.

7. In the Otopolymer one transfer method, the transfer process is complicated and images cannot be obtained quickly, and the cost is also high. The toner transfer method causes toner to scatter, which is unfavorable in terms of environmental hygiene. The silver halide method does not have these drawbacks, is low cost, has good workability, and can quickly produce color proofs.

However, the final image obtained by the commonly used exposure method for color sensitive materials is insufficiently sharp;
Faithful color balance cannot be obtained.

Therefore, for color proofing, there is a need for an image forming method that combines halftone reproducibility, color balance reproducibility, and color tone reproducibility of printing paper that are faithful to printed matter.

[Prior art]

In methods for producing color proofs using color sensitive materials, various techniques for obtaining target colors have been disclosed.

For example, JP-A-53-141034 describes a method for preparing a colored reference diagram and determining the exposure time. However, although this method can achieve the desired monochromatic density of yellow, magenta, and cyan, it cannot obtain a color proof with a good color balance of blue, green, and red that can be obtained with the additive method, and the exposure method is complicated. It became.

JP-A-56-104335 discloses a method for producing a color proof in which the overall photographic gradation of a color sensitive material is 2.0 or more. However, there is no description regarding the leg photographic gradation, leg photographic gradation balance, and parallelism of exposure light for yellow images, magenta images, and cyan images. As specific examples of color sensitive materials, there are descriptions of Fuji Color Vapor 08.7 Cyclome Paper Type 31, Kodachrome 74RC, etc., which are generally commercially available, but in both cases, the leg photographic gradation balance is because they are printed from color film to color paper. The resulting images are not sufficiently sharp, the reproduction of highlights of fine text and patterns is poor, and it is difficult to clearly distinguish them from white backgrounds, making them unsuitable for color proofing. It was something that didn't exist.

There is also a method of creating a color proof, which is described in JP-A No. 56-113139, in which the overall photographic gradation of a color sensitive material is 2.0 or more and includes other component colors during exposure, but this method corrects any color. However, the effect in terms of color approximation to printing paper and color balance was poor.

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

(1) [Place the manuscript and photosensitive material in close contact.

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

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

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

However, in the printing process, a film original of one color is often composed of a plurality of overlapping films, and color proofs may also be used in such a process. In addition, the original film is exposed from the emulsion side,
Sometimes the back side is exposed in close contact.

In this way, the original image separated from the photosensitive material cannot be brought into close contact with the photosensitive material, so that the reproducibility of fine lines and highlight areas is significantly degraded. Especially when using ordinary color photosensitive materials, even if a silver salt emulsion with a high-contrast characteristic curve is created and coated, the image reproducibility of fine lines and highlight areas, which are not suitable as color proofs, is poor. I could only get it.

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

(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 polyolein layer of a reflective support in which the 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 generally used for commercially available color photosensitive materials for printing, but the content of water-soluble dyes is low, and the maximum photosensitive wavelength of each image forming layer before the color photosensitive material is developed. Each reflection density at is less than 0.5. For this reason, sufficient sharpness and faithful color proof cannot be obtained.

With method (2), staining occurs due to poor bleach-fixing of colloidal silver and deterioration of the white background due to fogging of silver halide, and the photographic gradation is significantly softened, resulting in images with poor color balance as color proofs. can't get it. For this problem, Japanese Patent Application Laid-Open No. 63-63034
In JP-A No. 63-63040, a regulation on the thickness of the antihalation layer was proposed.
No satisfactory effect can be obtained.

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.

In addition, in either method, when 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.

To make it more similar to printed matter, perform full-surface exposure before or after image exposure to lower the maximum image density (in the case of positive), or increase the density of the base to approximate printing paper (in the case of 2ga). ) method is possible, but commercially available color paper is designed to have a soft tone so that density changes can be faithfully reproduced, and when this is used, the tone becomes even softer due to full exposure, affecting even the halftone image, resulting in a small image. Reproduction of spots and large fish becomes poor.

On the other hand, various printers widely used in the printing industry are known as methods for exposing photosensitive materials with parallel light. Even when exposing a photosensitive material with a small amount of light, halftone dot reproducibility with a good color balance suitable for color proofing could not be obtained.

[Purpose of the invention]

Therefore, the object of the present invention is to eliminate deterioration of white background and photographic gradation,
Using a color sensitive material with significantly improved sharpness and halftone gradation reproducibility, color proofing produces faithful halftone reproducibility with good sharpness, color balance, and colors that approximate the hue of printing paper. An object of the present invention is to provide an image forming method. More specifically, there is less blurring in the halftone fringes (contours of fine points), and by uniformizing the halftone quality and halftone reproducibility of yellow, magenta, and cyan images, faithful color balance can be achieved. It is an object of the present invention to provide a color image forming method capable of obtaining a color proof having a color proof similar to the hue of printing paper.

[Structure of the invention]

The present inventors found that there is a strong correlation between full-face exposure processing and leg photographic gradation, and that if the leg photographic gradation is 1.7 or higher, halftone fringes in highlight areas will occur even if full-surface exposure processing is performed. It was found that the bleeding in the area did not become large. Furthermore, by exposing this photosensitive material to parallel light using a resolution mesh original, not only the blurring of the halftone dot fringes but also the halftone dot reproducibility can be improved.
It has been found that reproducibility close to that of the original product can be obtained.

A particularly preferable leg photographic gradation is 2.0 or higher. In order to stabilize the exposure latitude, the photographic gradation at a density of about 1.7 is preferably 1.8 to 2.5.

It has also been found that a color proof with good color balance can be obtained by making the degree of bleeding in the halftone dot 7 rim area uniform in yellow, magenta, and cyan images, and by aligning the balance of fine point reproducibility. That is, it means that the leg photo gradations of yellow, magenta, and cyan images are close to each other when exposed with parallel light, and we have found that it is particularly effective if the leg photo gradation balance is within ±7% for each. The present invention has been accomplished.

That is, the above object of the present invention is to provide photographic constituent layers including a silver halide emulsion layer for forming a yellow image, a silver halide emulsion layer for forming a magenta image, and a silver halide emulsion layer for forming a cyan image on a support. A color image forming method in which a color image is obtained by exposing and developing a silver halide color photographic light-sensitive material comprising: This is achieved by performing full-surface exposure using a color correction filter in addition to image exposure on a color photographic light-sensitive material which has a gradation of at least 1.7 and whose leg photographic gradation balance is within ±7%. .

The present invention will be explained in more detail below.

In the present invention, the leg photographic gradation is defined as a characteristic curve with fog +
The point that intersects with 0.25 (A in Figure 1) and fog +0.75
It is defined as the photographic gradation obtained when connecting the intersection point (B in Figure 1).

The photographic gradation of the legs depends on the chemical ripening conditions of the silver halide emulsion (for example, the amount of sodium thioate, ripening temperature, ripening time, etc.), the distribution width of halogen chemical particles (for example, monodisperse emulsion, polydisperse emulsion), additives ( For example, stain inhibitors, couplers, etc.) and development conditions can also be used for adjustment, but it is preferable to adjust the former during the production of the silver halide emulsion.

Further, the leg photographic gradation balance as used in the present invention is each γA=leg photographic gradation γ of an arbitrary silver halide emulsion layer, ': leg photographic gradation of another silver halide emulsion layer.

The leg photographic gradation balance is within ±7% by adjusting the leg photographic gradation of the yellow image, magenta image, and 777 image of the color photosensitive material used in the parallel light exposure system using the above method. can be suppressed to

In the present invention, halftone reproducibility refers to a value obtained by converting the density to the halftone percentage according to the Murray-Davis formula, and is usually obtained by 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 measured concentration value using the following formula.

Dt: Density of the dotted area Ds: Density of the solid part (all values when the fog density is 0) When the dot % calculated by this formula is plotted against the original dot % of the decomposed dot original, it is calculated as follows: , shows an arcuate 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 provides a system in which exposure is performed with parallel light, in which at least one of the leg photographic gradations of a yellow image, magenta image, and cyan image of the color sensitive material used is 1.7 or more, and the leg photographic gradation is 1.7 or more. By fully exposing the photosensitive material using a color correction filter, which has been adjusted so that the tonal balance is within 7% of each other, the tone reproducibility, halftone density, halftone dot reproducibility, color balance, and white background can be improved. It has now become possible to obtain color images that closely resemble printed matter.

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

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.

Silver halide grains may be formed by any of the acid method, neutral method, and ammonia method (methods known in the photographic field such as simultaneous mixing method, forward mixing method, back mixing method, and conversion 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, heminanine 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 light-sensitive material contains a diffusion-resistant coupler that forms a dye by coupling with an oxidized product of an aromatic primary amine compound (for example, a p-7 unilene diamine derivative or an aminophenol derivative) during color development processing. is 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. 3.062653, No. 3,
No. 152,896, No. 3,558,318, No. 3,9
30゜866, JP-A-49-29639, JP-A No. 50-
It is described in No. 13041, etc.

Phenol or naphthol couplers are commonly used as cyan dye-forming couplers. These 7
Examples of uncoupler include U.S. Pat. No. 2.369.992, U.S. Pat.
No. 3,034,892, No. 3,839.044, JP-A-47-3742, No. 50-112038, No. 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.

The above-mentioned dye-forming couplers, ultraviolet absorbers, and other hydrophobic compounds are usually mixed with high-boiling organic solvents (e.g., phthalates, phosphates, phenol derivatives, alkylamides, and/or chloroalkanes), and optionally with low-boiling compounds. It is used by dissolving it in combination with a water-soluble organic solvent and/or by 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 can contain various photographic additives. For example, color image stabilizers, color stain preventive agents, optical brighteners, antistatic agents, hardeners, surfactants, plasticizers, wetting agents, etc. described in Risachi Disclosure Magazine No. 17643 may be used as appropriate. A giant monkey.

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 hopper 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 (rR
C base paper), baryta paper, plastic film containing white pigment, etc., especially those with a thickness of 100 to 15
0 μI RCW paper is preferred.

Examples of the light source used for exposure in the present invention include natural light, a tungsten electric lamp, a fluorescent lamp, a mercury lamp, and a /\logen electric lamp.

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 the reproducibility of halftone dots, especially the reproducibility of small dots and large dots. is preferably 76° or more.

Methods of obtaining parallel light from the light source as described above include a method of measuring distance using a point light source, a single cam board, a self-hock lens, a fiber array, and the like. Among these, honeycomb boards, cell-hock lenses, fiber arrays, etc. are effective. Although the original does not necessarily need to be in close contact with the photosensitive material, it is preferable that the document be crimped or brought into close contact with the photosensitive material. Particularly preferably, parallel light is used for vacuum contact.

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

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.

〔Example〕

The present invention will be explained in detail below with reference to Examples, but the present invention is not limited to the Examples.

Example-1 As a support, on a paper support whose front surface was coated with polyethylene containing titanium oxide and whose back surface was coated with polyethylene,
An emulsion layer and a cook layer having the structures shown in Table 1 were coated to prepare a negative color photosensitive material.

In the table, the amount added is shown in g/l112. However, as a coating aid on the emulsion layer side, a surfactant (S-1),
(S-2) and (H-1) as a hardening agent.

(H-2) was used.

Each spectrally sensitized silver halide emulsion has a coefficient of variation of 0.1
By using the monodispersed emulsion No. 9 and varying the amount of sodium thiosulfate, temperature, and time during chemical ripening, samples with the photographic tones of the legs shown in Table 2 were obtained.

C5Hly sFh+(t) Al-2 D　OP dioctyl phthalate D　N　P+Dinonyl phthalate DIDP diisodecyl phthalate P V P: Polyvinylpyrrolidone I-1 CH C2H.

CH, C00CH2CHC, H.

CHCOOCH2CHC,H.

So, Na, C, H.

OJa ShiU H-2C((H2SO2CH-CH2)1 The sample obtained as above was subjected to the following treatment.

(N method) The area ratio is changed from 0% to 100% at 150 lines/inch as the original. Using a transparent black and white dot image, the original is vacuum-adhered to the photosensitive material, and the space between the light source and the original is By inserting a honeycomb board into the frame, the angle of the exposure light was adjusted and exposure was performed in separate colors.

A halogen lamp was used as a light source, and Koda Nklanten filters No. 47B (blue), No. 61 (green), and No. 29 (red) were used as color separation filters.

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.

In addition, in order to approximate the hue of newsprint using a color correction filter, we combined yellow, magenta, and cyan color correction filters with an ND filter to adjust the amount of light.
Full exposure was performed after image exposure without color plate film.

The exposure was carried out under both conditions: 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 2 minutes 38°C bleach fixing
45 seconds 33°C stabilization 1 minute 30 seconds 3
Drying at 3℃ for 1 minute 70℃ Color developer composition After oxidation, adjust the pH to -10.15.

Bleach-fix solution composition Iron diamine tetraacetate (I [[) 4.5 g 2.0 g 25.0 g 0.1 g 0.2 g 2.0 g 10.0 m12 Sodium salt 60.0 g Ammonium thiosulfate 100.0 g
Sodium bisulfite 20.0g Add water to make IQ, and adjust to pH - 7.0 using sulfuric acid.

Stabilizing liquid 5-chloro-2-methyl-4-inchazolin-3-one 1.0 g Ethylene glycol 1.0 g 1-hydroxyethylidene-1.1-diphosphonic acid 2.0 g Ethylenediaminetetraacetic acid 1.0 g Ammonium hydroxide ( 20% aqueous solution) 3.0g ammonium sulfite 3.0g optical brightener (
4.4'-diaminostilbendisulfonic acid derivative)
Add 1.5g of water to obtain IQ, and adjust to pH -7.0 with sulfuric acid or potassium hydroxide.

The following evaluations were performed on the rabbit processed 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 to evaluate halftone reproducibility.

×: Color images with crushed flash points and poor dot reproduction compared to printed matter. Δ and × are images that do not reach the target.

Dt=Density of halftone part (value when fog density is 0) DS2 Density of dark part (value when fog density is fO) Dot gain amount - D (%) - DO (%) Do: w halftone dot area (2) Reproducibility of large spot areas The reproducibility of 1-10% (flame spot areas) of the manuscript was visually evaluated.

Small dot reproducibility: The reproducibility of 90 to 99% (small dots) of the manuscript was visually evaluated.

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

○...Color image with halftone image quality similar to that of the printed matter △...A color image agent that is out of balance with respect to the printed matter, and an aqueous solution of silver nitrate and a mixed aqueous solution of sodium chloride and potassium bromide (molar ratio 1:l) was added at the same time to prepare a cubic core/shell type emulsion (EM-1) consisting of a silver bromide core and silver chlorobromide/L having an average grain size of 0.45 μm.

RD-1, RD- suitable for each photosensitive layer of the above emulsion
After spectral sensitization by adding sensitizing dyes 2, CD-1, and BD-1, each of the layers shown in Table 4 below was applied to the surface of a support whose both sides were laminated with polyethylene. The 9th layer and the back layer were coated with the composition shown in Table 4, and the silver halide color copying example-2 was set in the image exposure device Konica Consensus ■ (manufactured by Konica Corporation). Blue light, green light, red light,
After multiple exposure of blue, green, and red, the separated negative plate is removed, and a combination of color correction filter and ND filter is used to adjust the amount of light to the density of newsprint, and the fully exposed photosensitive material is developed. A full-color image was then obtained. When the small point reproducibility and flash point reproducibility of this image were visually evaluated with a magnifying glass, the reproducibility of the dots was clear.
Furthermore, the color tone of the base was similar to that of newsprint, and the reproduction of the image was similar to that of newspaper printing.

-If the image is not fully exposed, the whiteness of the base will be emphasized,
There was no approximation to newspaper printing.

Example 3 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 obtain cubic silver bromide particles with an average particle size of 0.3μ. An emulsion consisting of This milk table addition amount is based on silver conversion.

CD CH2C00H (cHt)ssoxe In addition, a surfactant (S-1) is used as a coating aid on the emulsion layer side.
, (S-2) and (H-1) (H-2) as hardeners.
It was used.

Each spectrally sensitized silver halide emulsion has a coefficient of variation of 0.1
By using the monodispersed emulsion No. 9 and varying the amount of sodium thiosulfate, temperature, and time during chemical ripening, samples with the photographic gradations of the legs shown in Table 5 were obtained.

C-1 C-1 0-P c, H++(n) CsH1+(n) 5T-4 0 ■ g H H V-2 T-3 (Exposure method) Color separation exposure was performed in the same manner as in Example-1.

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

In addition, after each color exposure, a color correction filter and an ND filter for adjusting the light amount are combined to determine the maximum density of each color (
The entire surface was exposed so that the solid density was 1.7 to 1.8.

A comparison was made with one in which the entire surface was not exposed.

(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 -1 lux for 10 seconds (3) Color development at 38°C for 2 minutes (4) Bleach-fixing
35°C 60 seconds (5) Stabilization treatment 25-30°C
1 minute 30 seconds (6) Drying 75-80°C
1 minute processing solution composition (color developer) Benzyl alcohol 15mQCez
(So+)+ Ethylene glycol Potassium sulfite Potassium bromide Sodium chloride Potassium carbonate T-4 Hydroxyl/lamine sulfate Polyphosphoric acid (TPPS) N-Ethyl-N-β-hydroxyethylene diamine sulfate Optical brightener (44゛- Diaminostilbendisulfonic acid derivative) Add potassium hydroxide diethylene glycol water to bring the total volume to lI2 (Bleach-fix solution) Ethylenediaminetetraacetic acid ferric ammonium dihydrate Ethylenediaminetetraacetic acid 1.0g 2.0g 5mff Adjust to pH 10,20 .

0.015g m12 2.5g 0.8g 0.2g 25.0g O,1g 5, Og g p-phenymu 5.0g 0g g Ammonium thiosulfate (70% solution) 100m
4 Ammonium sulfite (40% solution) 27.
5a+ff Adjust the pH to 7.1 with potassium carbonate or glacial acetic acid, and add water to bring the total volume to 1a.

(Stabilizing liquid) 5-chloro-2-methyl-4-inchazolin-3-one 1.0 g Ethylene glycol 10 g 1-hydroxyethylidene-1,1-diphosphonic acid 2.5 g Bismuth chloride 0.28 Magnesium chloride 0.1 g Ammonium hydroxide (28% aqueous solution) 2.0g Sodium nitrilotriacetate 1.0g Add water to bring the total volume to 1
I2 and pH 7.0 with ammonium hydroxide or sulfuric acid.
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 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 Sensitive material 6 was placed in the exposure device in the same manner as in Example 2, and exposed to blue light among the four color separation positive plates with the plate on the bottom and the Y plate on top. Remove the M plate, place the M plate on top of the plate and expose it to green light, then remove the M plate, overlap the 0 plate, expose it to red light, remove the plate, and apply color correction and ND filter. In combination, the entire surface was exposed so that the maximum density (solid density) of each color was 1.7 to 1.8. In addition, a sample that was not entirely exposed to light was used as a comparative material. When this photosensitive material was developed, a full-color image was obtained. Visual evaluation of the dot reproducibility and flash reproducibility of this image using a magnifying glass revealed that the dots were clearly reproduced and the color tone was similar to that of the printed matter. - No full surface exposure l: The maximum density of each color in the comparative material was 2.0 to 2.2, and the color tone was dark and did not resemble the printed matter.

As is clear from the results shown in Table 3 and Table 6 Example 2.4, when the photosensitive material according to the present invention was used and the exposure according to the present invention was carried out, an extremely excellent mesh was obtained. An image with good point reproducibility and color tone can be obtained.

〔Effect of the invention〕

As described above, a color photosensitive material in which at least one of the leg photographic gradations of yellow, magenta, and cyan images is 1.7 or more, and the balance of the leg photographic gradations is each within ±7%. By combining parallel light exposure with full-surface exposure via a color correction filter, this image forming method obtains color images from film originals with excellent sharpness and halftone reproducibility and color tone that are very similar to those of printed matter. An image with the following values is obtained.

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

[Brief explanation of drawings]

FIG. 1 illustrates a method for determining the leg photographic gradation of a photographic light-sensitive material. D represents the reflection density, (logE is the exposure amount expressed logarithmically. F represents the fog value, A is the point on the characteristic curve that takes the value of D or F + 0.25, and a is the point on the characteristic curve that takes the value of D or F + 0.25. represents the 1ogE value at the time.Similarly, B is D
is the point that takes the value of F+0.75, and b is the corresponding l
og represents the E value.

Claims (1)

[Claims] A silver halide color photographic light-sensitive material having photographic constituent layers including a silver halide emulsion layer forming a yellow image, a silver halide emulsion layer forming a magenta image, and a silver halide emulsion layer forming a cyan image on a support. In a color image forming method for obtaining a color image by exposing and developing a color image, the exposure light is parallel light, and at least one of the leg photographic gradations of the yellow image, magenta image, and cyan image is 1.7. A method for forming a color image, which is characterized in that the color photographic light-sensitive material having the above structure and the balance of photographic gradations of the legs is within ±7% is exposed entirely to light through a color correction filter.