JP2000131727A - Film unit with lens and method for preparing printed picture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film unit with a lens adequate for photographing in a room and at night, and a method for preparing a printed picture. SOLUTION: As to this film unit with the lens; a stop value A by a diaphragm plate 41, the shutter speed T of a shutter device, and the ISO sensitivity S of a photographic film 26b are decided so as to satisfy the condition of the expressions of -6<=2 log2 (A)+log2 (1/T)-log2 (0.3.S)<=5. The guide number of a stroboscopic device 23 is decided to be 0.1 to 8. When the photographing is performed in such a dark place as the inside of the room, the printed picture in which a main object and a back ground are adequately described can be prepared. A straight line part is extended to the foot part of the characteristic curve of the film 26b and tone correction is performed by digital image processing, so that the printed picture having good tone reproduction can be prepared from an underexposed photographic film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film unit with a lens.

[0002]

2. Description of the Related Art Various types of lens-equipped film units have been sold in which an unexposed photographic film is loaded at the time of manufacture in a unit body incorporating a simple photographing mechanism such as a photographing lens, a shutter device, and a film winding device. Some film units with a built-in flash unit incorporate a flash unit to enable shooting in dark places such as at night or indoors.

In a film unit with a built-in strobe, a combination of a shutter speed, an aperture value, and a film sensitivity is set so as to correspond to the brightness in the daytime. It is designed so that flash photography that is appropriate for a main subject at a shooting distance of about 4 m is performed.

[0004]

However, when flash photography is performed indoors or outdoors at night using a conventional film unit with a built-in flash with a lens, the main subject such as a person is overexposed, while the background is overexposed. Is often underexposed and a satisfactory print photograph cannot be obtained in many cases. This is because the combination of shutter speed, aperture value, and film sensitivity is determined based on daylight shooting,
This is because the strobe light amount is determined based on a main subject located at a shooting distance of about 1 to 3 m.

[0005] In addition, it is very likely that flash photography is performed indoors. However, when flash photography is performed indoors, the illumination light of a fluorescent lamp is often mixed in a photography screen. However, since the color temperature of the illumination light from the fluorescent lamp is different from that of the strobe light, when printing is performed based on the color temperature of the strobe light, the green color is superimposed on the part illuminated by the fluorescent lamp. Conversely, when printing is performed based on the color temperature of the fluorescent lamp, there is also a disadvantage in terms of color reproducibility that the skin color of the person becomes an inappropriate color.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it has been found that, when photographing indoors or outdoors in a dark place, the exposure can be satisfied not only for the main subject but also for the background irrespective of whether or not a strobe is used. It is an object of the present invention to provide a film unit with a lens capable of photographing at a level, and when obtaining a print photograph from a negative photographed with the film unit with a lens, a print excellent in gradation and color reproducibility. The purpose is to provide a photo creation method.

[0007]

The above objects of the present invention can be attained by achieving the following objects 1 to 5. 1: The background is exposed to the photographic film at a certain exposure level 2: The main subject is exposed at an appropriate exposure level 3: The blur and camera shake due to insufficient depth of field are at a level where there is no problem. 4: When the main subject is a person, the skin color is appropriately expressed on the printed photograph. 5: There are few failures in shooting due to underexposure.

For this reason, the lens-fitted film unit of the present invention satisfies the following conditional expressions, conditions and the like corresponding to each item. In order to achieve item 5, a method for achieving this can be employed in one or both of the film unit with lens and the print making stage.

First, to achieve item 1, the present inventors investigated the photographing environment of a general user using a film unit with a lens. As a result, the illuminance of the background indoors and at night was 75 lux or more in most cases. I found it. Then, when photographing is actually performed using the film unit with a lens under such a photographing environment, it is confirmed how satisfactory the system photograph of the film unit with the lens can be to obtain a satisfactory print photograph. For this purpose, six types of samples having different system sensitivities were prepared, and 20 representative images were taken of a representative indoor scene.

[0010] The system sensitivity is a film unit with a lens having a built-in photo film of ISO sensitivity S. When a photograph is taken at a shutter speed T (sec) and an aperture value A, the optimum exposure amount for the photo film is determined. Represents a value that can be given and is defined by the following equation. 2 log ₂ (A) + log ₂ (1 / T)-log ₂ (0.3 · S)

For the six types of samples, the system sensitivity can be changed by changing the shutter speed T.
The O sensitivity S and the aperture value A are “800” and “F5.
6 "is constant. After photographing, film development and print processing were performed by a standard process to evaluate whether or not the main subject and the background were properly represented on the printed photograph. The results shown in Table 1 below were obtained. .

[0012]

[Table 1]

From the results of this evaluation, the system sensitivity is "-
It has been found that the main subject and the background can be appropriately photographed within the range from “6” to “5”.
Also, if the system sensitivity is in the range from “−2” to “4”, appropriate shooting can be performed in most scenes, and if the system sensitivity is in the range from “1” to “3”, almost all scenes can be shot. It can be seen that appropriate shooting is possible.

Accordingly, the aperture value A of the lens-equipped film unit and the shutter speed T (sec) of the shutter device are set so as to satisfy the following conditional expression, and more preferably, to satisfy the conditional expression. ,
Item 1 can be achieved by combining the ISO sensitivity S of the photographic film. −6 ≦ 2 log ₂ (A) + log ₂ (T) −log ₂ (0.3 · S) ≦ 5 -2 ≦ 2 log ₂ (A) + log ₂ (1 / T) −log ₂ (0.3 · S) ≦ 4 ... 1 ≦ 2 log ₂ (A) + log ₂ (1 / T) −log ₂ (0.3 · S) ≦ 3 ...

It is also desirable to mount an exposure adjustment mechanism for adjusting the exposure manually or automatically by adjusting the aperture value A, shutter speed T and the like. In this case, it is preferable to provide a shooting mode in which the system sensitivity is out of the conditional expression. That is, since the above conditional expression is derived on the premise of shooting indoors and at night, it is not always possible to obtain appropriate exposure conditions in a bright environment such as outdoors during the day. It is desirable to provide an exposure amount adjusting mechanism in consideration of performing photographing in an environment.

The simplest method for realizing the adjustment of the exposure amount is that one or both of the aperture value A and the shutter speed T are changed according to the operation of the operation member for selecting whether or not to use the flash. It is to be switched.
Then, at the time of strobe light emission, the above-mentioned conditional expression is satisfied, and when the strobe light emission is not performed, the aperture value is increased to close the aperture to increase the shutter speed.

Regarding item 2, it is desirable that the film unit with a lens be provided with a strobe device so that strobe photography can be performed. Also, when a strobe device is provided, the strobe light amount, that is, the guide number needs to be an appropriate size.

The guide number is determined by the distance to the subject (photographing distance) to obtain an appropriate exposure with the strobe light, the aperture value A, the ISO sensitivity S of the photographic film, and the like. It will change, but if you satisfy the conditional expression of item 1 above, or if you satisfy the guide number, you can check the guide number including the sample that does not emit flash light in order to confirm the satisfactory print photo. Number G (ISO10
5) were prepared, and 20 representative images were taken of each representative indoor scene.

For each sample, the guide number G
Are different, and the ISO sensitivity S, the aperture value A, and the shutter speed T are “800”, “F5.6”, “1”, respectively.
/ 30 (sec) ", which satisfies the conditional expression corresponding to item 1. After photographing, film development and print processing are performed in a standard process, and whether the main subject using the strobe light as the light source is appropriately expressed on the printed photo, or whether the density ratio of the main subject to the background is appropriate When two points were evaluated at the same time, the results shown in the following Table 2 were obtained.

[0020]

[Table 2]

Based on the evaluation result, the film unit with the lens is provided with a guide number G (I
SO100 · m) is found to be in the range of “0.1” to “8”, preferably in the range of “0.1” to “6”, and more preferably in the range of “3” to “5”. In this case, satisfactory print photographs can be obtained in almost all scenes, which is more preferable. By doing so, it is possible to obtain an appropriate exposure for the main subject and increase the probability that the density ratio between the main subject and the background becomes appropriate on a printed photograph.

Therefore, the guide number is set to G (ISO
100 m), the strobe device of the film unit with the lens emits strobe light so as to satisfy the following conditional expression, and more preferably, to satisfy the conditional expression, and more preferably with the amount of light that satisfies the conditional expression. Item 2 can be achieved. 0.1 ≦ G ≦ 8 0.1 ≦ G ≦ 6 3 ≦ G ≦ 5

In achieving the object of item 2,
By adjusting the guide number G (ISO 100 · m) and the shutter speed T (sec), “log ₂ (G ² ) + log ₂
(1 / T) "are created, and the film units with various lenses are different.
For each of the representative indoor scenes, 20 pictures were taken. Then, evaluation was performed in the same manner as described above, and the results in Table 3 below were obtained. The ISO sensitivity S and aperture value A of each lens-equipped film unit are “80”.
0 "and" F5.6 ".

[0024]

[Table 3]

From this evaluation result, it is found that the relationship between the guide number G (ISO100 · m) of the strobe device and the shutter speed T should satisfy the following conditional expression, more preferably the following conditional expression. Was. By satisfying such a conditional expression, item 2 can be achieved, and in any environment, the main subject can be appropriately exposed to light, while the appropriate exposure can be performed on a printed photograph. The background can be reproduced in an appropriate density range. 7.0 ≦ log ₂ (G ² ) + log ₂ (1 / T) ≦ 12.0 ... 8.0 ≦ log ₂ (G ² ) + log ₂ (1 / T) ≦ 10.0 ...

The above conditional expression can be used regardless of whether or not the conditional expression corresponding to item 1 is satisfied. In addition, when the exposure amount adjusting mechanism increases the aperture value A to enable shooting during the daytime outdoors, it is desirable that the guide number can be increased accordingly. In this way, it is possible to create a good print photograph even when performing daytime synchro photography when performing backlighting outdoors in the daytime.

The blur caused by the insufficient depth of field of item 3 depends on the aperture value A. As the aperture value A increases, the depth of field can be increased, and a good focus can be obtained over a wide shooting distance. . In addition, camera shake can be reduced by increasing (shortening) the shutter speed T.
In order to realize these, under the conditional expression of item 1,
A large aperture value A and a high shutter speed T can be selected by increasing the value of “log ₂ (0.3 · S)” by using a high-sensitivity photographic film of a film unit with a lens. As a specific condition, the ISO sensitivity of the photographic film is preferably 640 or more, more preferably 1000 or more.

Regarding item 4, the biggest factor that hinders the expression of the skin color of the main subject person into an appropriate color on a printed photograph is that of a strobe device for a photographic film and a fluorescent lamp used for illumination in a room or the like. Between the light source colors (color temperatures). That is, the fluorescent lamp visually outputs white light, and the illuminated background is observed in the object color, but the spectral sensitivity between the human eye and the photographic film is different, and the type of the fluorescent lamp is different. Depending on the photographic film, the fluorescent light tends to be more sensitive to the green light-sensitive layer on the photographic film, while the strobe light is almost neutral. Was found to have a green tint in the color on the printed photograph.

When the color of the background becomes green as described above, when the printer processor performs automatic color correction to create a print photograph, the entire color of the printer processor is affected by the color of the background and becomes green. Magenta, which is a complementary color of, is enhanced so as to cancel green. Then, even for a person image illuminated with strobe light, the color of magenta is strengthened, and it is the most unfavorable for reproduction of skin color, that the skin color of the person's face is reddish like drunk drunk Become.

Of course, if a print photograph is created by manually performing color correction so as not to be affected by the tint of the background, the flesh color of a person can be properly reproduced. The color remains green. The green color is also referred to as “Ugly green” and is unsightly and unpleasant, and causes deterioration in the quality of a printed photograph.

The present inventors have conducted intensive studies in consideration of the above points, and as a result, have found that a CIE 1976 L ^* a ^* b ^* space (hereinafter referred to as CIE) corresponding to the light source color of a fluorescent lamp obtained by the following method.
Chromaticity Index a in LAB)
It was found that if the film unit with the lens is configured such that ^* and b ^* satisfy the following condition (1), the skin color can be reproduced in an appropriate color on a printed photograph. It was also found that the condition (2) may be satisfied.

Condition (1) “0 ≦ √ ((a ^* ) ² + (b ^* ) ² ) ≦ 5.0” Condition (2) “0 ≦ √ ((a ^* ) ² + (b ^* ) ² ) ≦ 15.0 and 0 ° ≦ Y ≦ 100.0 ° ”or“ 0 ≦ √ ((a ^* ) ² + (b ^* ) ² ) ≦ 15.0 and 210 ° ≦ Y ≦ 360.0 ° ” However, when a ^* = 0 and b ^* = 0, Y = 0 ° When a ^* ≠ 0 and b ^* ≠ 0, Y = tan ⁻¹ (b ^* /
a ^* ), and when a ^* ≧ 0 and b ^* ≧ 0, 0 ° ≦ tan ⁻¹ (b ^* /
a ^* ) ≦ 90 ° When a ^* ≦ 0 and b ^* ≧ 0, 90 ° ≦ tan ⁻¹ (b ^* / a
^* ) ≦ 180 ° 180 ° ≦ tan ⁻¹ when a ^* ≦ 0 and b ^* ≦ 0 (b ^* /
a ^* ) ≦ 270 ° When a ^* ≧ 0 and b ^* ≧ 0, 270 ° ≦ tan ⁻¹ (b ^* /
a ^* ) ≦ 360 °.

As the chromaticity indices a ^* and b ^* in the above conditions (1) and (2), those obtained by the following procedures (a) to (e) are applied. (A): Using a strobe device as a light source, appropriately exposing a gray reflecting plate (hereinafter referred to as a standard reflecting plate) having a reflectance of 18% to a photographic film. (B): F6 type fluorescent lamp specified in JIS Z 8719 Exposure of a standard reflector to a photographic film using the light source as a light source (c):
A chromaticity index a ^* in CIELAB obtained when a color print is made on a color photographic paper using the photographic film obtained in (a) and the tint of the standard reflector is measured on the print photograph thus prepared ^. , B
^Find print conditions where ^* becomes "a ^* = 0, b ^* = 0". (D): Under the print conditions found in (c), use the photographic film obtained in (b) to print on color photographic paper. Perform color printing to create a print photograph (e): On the print photograph created in (d), measure the tint of the standard reflector, and use this measurement for the chromaticity index a in CIELAB used in the above conditional expression. ^{* And} b ^* are obtained. However, when measuring the color in steps (c) and (d),
Standard light D65 is used as illumination light.

When the chromaticity indices a ^* and b ^* are obtained as described above, the chromaticity indices a ^* and b ^* are calculated based on the fluorescent light when the tint of the standard reflector imaged using the strobe device as a light source is taken as the origin. The color of the standard reflector imaged as a light source is represented as coordinates in CIELAB.

Therefore, “√ ((a ^* ) ² + (b ^* )”
² ) "is the difference between the tint of the standard reflector photographed with the fluorescent lamp as the light source and the standard reflector photographed with the light source of the strobe device as the light source, that is, the light source color and the fluorescent light of the strobe device on the photographic film. It represents the difference in the color of the light source color of the lamp. “Tan ⁻¹ (b ^* / a ^* )” (Y) is the direction of the difference in the tint of the standard reflector photographed using a fluorescent lamp as a light source with respect to the standard reflector photographed using a strobe device as a light source; That is, the direction in which the color of the light source color of the fluorescent lamp is different from the color of the light source of the strobe device on the photographic film is represented.

Condition (1) is defined so that the color of the light source of the strobe device and the color of the light source of the fluorescent lamp for the photographic film are close to each other. According to this, since the light source color of the strobe device and the light source color of the fluorescent lamp are close on the photographic film, the skin color of the person using the flash device as the light source and the background color using the fluorescent lamp as the light source are similar. It will take on. Therefore, when creating a print photo, even if the color is corrected so as to negate the tint of the background, the effect of this color correction on the skin color of a person is considerably small,
It becomes possible to appropriately reproduce skin color on a printed photograph.

In the condition (2), when there is a difference between the light source color of the strobe device and the light source color of the fluorescent lamp for the photographic film, the difference is within a certain range, and the difference of the color is specified. Stipulates that a difference in color direction is acceptable. This also makes it possible to appropriately print the flesh color on the printed photograph. As for the specific color direction, when the light primary color of the strobe device is printed as non-tinted gray (“a ^* = 0, b ^* = 0”), the light source color of the fluorescent lamp is changed. It is defined so as to be approximately in the range from red to yellow and in the range from blue to magenta, so as to avoid unsightly and unpleasant green color.

In order to satisfy these conditions (1) or (2), the spectral energy of the strobe light by the strobe device built in the film unit with the lens and the spectral sensitivity of the loaded photographic film are adjusted. Can be. The adjustment of the spectral energy of the strobe light can be performed by protecting the strobe discharge tube of the strobe device, providing a dye filter on a protector or the like that diffuses the strobe light, or coloring the protector. Also,
The spectral sensitivity of the photographic film is adjusted by adjusting the spectral sensitivities of the blue, green and red photosensitive emulsion layers and proposed by the present applicant in Japanese Patent Application No. 10-111196. This can be achieved by adjusting the layering effect by providing a new photosensitive emulsion layer in addition to the emulsion layer on the photographic film.

With respect to item 5, if the exposure amount of the subject on the photographic film is small, the density region of the photographic film to be printed on the print photograph falls into the low density region, that is, the foot portion of the characteristic curve. At the foot, since the density with respect to the exposure amount is compressed, the gradation is not reproduced on the printed photograph. That is, a failure in photographing due to underexposure occurs.

Therefore, in order to reduce photographing failure due to underexposure, the linear portion of the characteristic curve capable of correctly reproducing the density (gradation) may be sufficiently long, that is, the latitude may be sufficiently wide. For this purpose, for example, in addition to widening the latitude of the photographic film itself by making it softer, digital image processing is performed when creating a print photograph with a printer processor, and the linear portion of the characteristic curve of the photographic film has a low density. In this case, it is possible to substantially increase the latitude of the photographic film by correcting the gradation of the image read from the photographic film corresponding to the foot of the characteristic curve so as to extend the area.

In order to reduce photographing failure due to underexposure as a film unit with a lens, it is necessary to use a photographic film having a longer latitude as described above or to incorporate an exposure amount adjusting mechanism in the film unit with a lens. is there. Also in the film unit with a lens of the present invention, it is desirable to use a photographic film with a wide latitude to reduce photographing failure due to underexposure. In order for the film unit with the lens to have an exposure amount adjusting mechanism, for example, a Japanese Utility Model No. 01-1
As disclosed in Japanese Patent No. 30118, the strobe switch and the aperture switch may be linked, or the shutter speed may be switched with a switch independent of the strobe switch or the like.

A method of widening the latitude of a photographic film itself or performing a digital image processing at the time of printing to substantially widen the latitude of the photographic film is as follows.
This is useful not only for reducing imaging failure due to underexposure but also for reducing imaging failure due to overexposure.

[0043]

FIG. 2 shows the appearance of a film unit with a lens embodying the present invention. This film unit with a lens is composed of a unit main body 2 and a label 3 that partially covers the unit main body 2. A photo film cartridge of the type is pre-loaded. This lens-equipped film unit makes it difficult to describe the main subject illuminated by the strobe light and the background with little effect of the strobe light, even when shooting in a relatively dark place such as outdoors or indoors at night. It is designed to create beautiful print photos that are not. In the following description, the film unit with a lens will be referred to as a film unit with an indoor lens for convenience of explanation.

On the front surface of the unit main body 2, there are provided a photographing lens 4, an object side window 6 of a finder 5, a strobe light emitting section 7 for irradiating a strobe light toward a subject, and an operation lever 8 for a strobe. Further, on the upper surface of the unit main body 2, there are provided a shutter button 10, a counter window 11 for displaying the number of remaining photographable frames, and an opening 13 from which a display light guide 12 for displaying the completion of flash charging is projected. Further, on the back of the unit main body 2, a hoisting knob 14 that is rotated for each frame is exposed,
An eyepiece-side window (not shown) of the finder 5 is provided at a position facing the objective-side window 6. The label 3 has its back surface coated with an adhesive and affixed to the central portion of the unit main body 2, and exposes the photographing lens 4, finder 5, counter window 11, and the like to the outside through openings provided in each portion.

The strobe light emitting section 7 includes a strobe discharge tube (not shown), a protector 7a for protecting the strobe discharge tube and diffusing strobe light, and the like. The strobe light emitting section 7a can provide strobe light with a predetermined spectral energy by attaching a dye filter to the front of the protector 7a or coloring the protector 7a itself.

The operation lever 8 turns the strobe device ON / O.
When the flash switch 15 (see FIG. 1) for FF is linked to the ON position where the switch is slid upward, the flash switch 15 is turned on to perform charging and allow flash emission. After the charging is completed, if the shutter release button 10 is pressed to perform shooting while the operation lever 8 is in the ON position, flash light is emitted from the flash emission unit 7 toward the subject in synchronization with the shooting. . Also, slide the operation lever 8 downward to
When the switch is set to the F position, the strobe switch 15 is turned off, charging is stopped, and strobe light emission is prohibited.

The display light guide 12 is connected to the operation lever 8.
The unit is slid to a projecting position protruding from the upper surface of the unit main body 2 and a storage position stored in the unit main body 2 in conjunction with the vertical slide of the unit. This display light guide 1
When the LED 2 is in the protruding position, its lower end faces the LED for charging completion display of the strobe device, and the LE for charging completion display.
D light is guided to the outside of the unit body 2. The charging completion display LED is turned on when charging is completed. This allows the display light guide 12 to indicate that the charging is completed.

FIG. 1 is an exploded view of the unit body 2. The unit main body 2 includes a main body base 20, an exposure unit 21, a strobe device 23, a front cover 24, and a rear cover 25. At both ends of the main body base 20, a cartridge room 2 is provided.
0a and the film roll chamber 20b are formed integrally. At the manufacturing stage, the photo film cartridge 26 is stored in the cartridge chamber 20a and the film roll chamber 20b, respectively.
Cartridge 26a and a film roll formed by rolling the photographic film 26b drawn out of the cartridge 26a. An aperture 20c for defining an exposure screen size on the photographic film 26b is formed in a central portion of the main body base 20.

The label 27 is provided on the surface of the cartridge 26a.
Is attached to the label 27, and the photo film 2 is attached to the label 27.
A code display 27a which encodes and displays film information such as a type, a film sensitivity, the number of photographable frames, etc., corresponding to the emulsion of 6b and the product to be destined, an ID number assigned to each cartridge, and the like. Bar code 27b and the like.

The IX240 type photographic film 26b is
A transparent magnetic recording layer is formed on the base surface side opposite to the emulsion surface, and a magnetic data track is set on this magnetic recording layer for recording various data. On the magnetic data track provided at the leading end of the photographic film 26b, the above-mentioned film information, ID number, etc. are magnetically recorded at the manufacturing stage. Further, in the non-photographing area at the leading end of the photographic film 26b, numbers and barcodes representing film information, ID numbers, and the like are side-printed at the manufacturing stage, and become apparent by development processing. At the time of development processing and print processing, film information is read from a magnetic data track of the photographic film 26b or a bar code that has been revealed, and processing based on the obtained information is performed.

The photographic film cartridge 26 constructed as described above is generally sold on the market or loaded in a normal lens-equipped film unit or the like. At the time of manufacture, film information specific to the film unit with a lens that requires a room is given. The photographic film 26b loaded in the film unit with the indoor lens has an ISO sensitivity (film sensitivity) specified at the time of design. The photographic film 26b loaded in the film unit with a lens for indoor use includes:
Negative color type.

The exposure unit 21 comprises a photographic mechanism such as a photographic lens 4 and a shutter device, and a finder 5 in a dark box 28 for shielding the optical path of the photographic lens 4 in a light-tight manner, similarly to a conventional film unit with a lens. This is a unit formed by assembling an objective lens and an eyepiece. The exposure unit 21 includes an aperture 20 c of the main body base 20.
Assembled in front of

A winding knob 14 is disposed above the cartridge chamber 20a, and the end of a winding shaft integrally provided on the lower surface thereof is adapted to engage with the spool of the cartridge 26a. Thus, when the winding knob 14 is rotated in the direction of the arrow in the drawing, the photographed portion of the photographic film 26b is wound into the cartridge 26a by the rotation of the spool.

The strobe device 23 includes a trigger switch 3 in addition to the above-described strobe light emitting unit 7 and strobe switch 15.
0, a main capacitor 31, a battery (AA battery) 32 serving as a power source, a circuit element for charging and discharging, etc.
3 and unitized. The strobe switch 15 is turned on / off in conjunction with the operation of the operation lever 8 as described above. The main capacitor 31 is charged when the strobe switch 15 is turned on.

The trigger switch 30 is composed of two contact pieces arranged vertically, and the two contact pieces come into contact with each other at the moment when the shutter blades are fully opened, and are turned ON. When the strobe switch 15 is turned on, the trigger switch 30
Is turned on, the electric charge charged in the main capacitor 31 is discharged in the strobe discharge tube. Thus, the strobe light is emitted from the strobe light emitting unit 7 toward the subject.

The front cover 24 has a shutter button 10 integrally formed on the upper surface thereof. In addition, an opening for exposing the photographing lens 4, the strobe light emitting section 7, and the like is provided on the front surface of the front cover 24, and the operation lever 8 is provided.
Is assembled. The front cover 24 is attached to the front surface of the main body 20 to which the exposure unit 21 and the flash unit 23 are attached. The rear cover 25 optically covers the rear side of the main body base 20 in which the photo film cartridge 26 is stored. Thereafter, the bottom cover 25 is attached to the bottom of the cover 25.
a, 25b are formed, and these bottom lids 25a, 2b are formed.
5b closes the bottoms of the cartridge chamber 20a and the film roll chamber 20b in a light-tight manner. Cartridge chamber 2
By opening the bottom cover 25a of the cartridge 0a, the cartridge 26a containing the photographed photo film 26b can be taken out.

FIG. 3 shows the exposure unit 21. Dark box 28
And the shutter cover 35 attached to this front
The shutter blade 36 is rotatably supported between them. The shutter blade 36 is urged by a spring 37 to a closed position where the shutter opening 38 is closed.
The shutter opening 38 is provided at the center of the front surface of the dark box 28, that is, on the photographing optical axis 4 a of the photographing lens 4.

An opening 39 is formed in the center of the front surface of the shutter cover 35, and a lens barrel 40 is formed so as to surround the periphery of the opening 39. The lens barrel 40 has an aperture plate 41 having a circular aperture aperture 41a as an aperture.
And the photographing lens 4 are fitted in order, and these are held by assembling the lens holder 43 to the lens barrel 40.

The kicking lever 44 is moved rightward in the figure in conjunction with the shutter release by pressing the shutter button 10. The upper end 36a of the shutter blade 36 is kicked by the kick lever 44, and the shutter blade 36 is rotated clockwise against the bias of the spring 37. Thereafter, the shutter blade 36 is rotated counterclockwise by the spring 37. The one-way swing of the shutter blade 36 opens and closes the shutter opening 38.
During the opening and closing of the shutter opening 38, the photographing light transmitted through the photographing lens 4 enters the dark box 28 through the aperture opening 41a and the shutter opening 38, and exposes the photographic film 26b. When the shutter blade 36 fully opens the shutter opening 38, the pressing device 36b presses the strobe device 2.
The third trigger 30 is turned on.

The shutter speed T of the shutter device comprising the shutter blade 36 and the kick lever 44 and the like,
The aperture diameter of the aperture 41a, ie, the aperture value A, the amount of strobe light emitted from the strobe light emitting unit 7, ie, the guide number G of the strobe device 23, and the photographic film 26
The ISO sensitivity S of b is fixed to a fixed value specified at the time of design so as to satisfy the conditional expressions of the respective items described above. However, it is possible to reduce failures in outdoor shooting in the daytime and shooting due to underexposure. In view of the above, it is preferable that the shutter speed T, the aperture value A, and the guide number G can be changed.

FIG. 4 shows an example of a digital printer processor (hereinafter referred to as a digital printer) for producing a print photograph from a photograph film. This digital printer is capable of producing gradations even from a photographic film 26b photographed so as to be slightly underexposed by the above-mentioned film unit with an indoor lens, which satisfies the conditional expressions and conditions corresponding to each item described later. The control program of the conventional digital printer is partially modified or added so that a print photograph with extremely good reproduction can be created.

This digital printer is roughly divided into an input unit 50 and an output unit 51. The input unit 50 includes a magnetic head 52 for reading data of a magnetic data track of the photo film 26b, a photo sensor 53 for optically reading a side-printed bar code or the like, and a photo film 26b.
Scanner 54 for reading an image from each shooting frame
It comprises a converter 55, an image memory 56, an image processing circuit 57, a transport mechanism (not shown) for transporting the developed photographic film 26b from the cartridge 26a to the scanner 54, and a controller 58 for controlling these.

While the photographic film 26b is being transported, the magnetic head 52 reads film information and the like from each magnetic data track of the photographic film 26b. The result of this reading is
It is sent to the controller 58. Further, while the photo film 26b is being conveyed, the photo sensor 53 reads the exposed bar code. The reading result of the photo sensor 53 is also sent to the controller 58. The results of reading by the magnetic heads 52 and the photo sensors 53 are decoded by the controller 58 and used for controlling image processing.

The scanner 54 is composed of a film carrier, an illuminating device for illuminating a photographing frame set on the film carrier, a CCD for reading the image of the photographing frame, a lens for forming an image of the photographing frame on the CCD, and the like. ing. Each time the photographic film 26b is transported by one frame, the scanner 54 images the image of the photographic frame by three-color separation, red, green and blue photometry using a CCD and captures the image. The obtained photoelectric signal is an A / D converter 55 Send to

The A / D converter 55 converts the image picked up by the CCD into red, green, and blue image data by digitally converting the photoelectric signal of each color. The three color image data is written to the image memory 56. When one frame of image data is written into the image memory 56, the image processing circuit 57 reads out the image data and performs predetermined image processing under the control of the controller 58.

At the time of this image processing, the photographic film 26b, which has been detected from the film information read by the magnetic head 52 as being of a type used for the above film unit with an indoor lens, is subjected to digital image processing. Performs normal image processing for creating a conventional print photograph, and also performs gradation correction based on the characteristic curve of the photograph film 26b. The gradation correction is performed such that the substantially straight line portion of the characteristic curve is extended to the foot of the characteristic curve corresponding to the low-density region, so that the gradation of the image read from the photographic film 26b is converted.

More specifically, based on the characteristic curve of the photographic film 26b, the image data in the low density region where the exposure amount is insufficient is subjected to gradation conversion processing, so that the exposure amount (even in the low density region portion) is obtained. In practice, the image data is corrected so that the rate of increase in density becomes substantially constant with the increase in the logarithm of the exposure amount. By this gradation correction, the linear portion of the characteristic curve is virtually expanded to the low-density region where the exposure is underexposed, that is, the latitude is lengthened, and the exposure is extremely excellent even in a shooting frame where the exposure amount is slightly insufficient. Create a printed photo that has been reproduced.

Similarly, the photographic film 26b is set so that the portion of the curved characteristic curve in the high density region, that is, the shoulder portion is an extension of the linear portion of the original characteristic curve of the photographic film 26b.
The gradation of the image read from is corrected. As a result, the linear portion of the characteristic curve is virtually expanded to a high-density region where overexposure occurs, and the gradation is extremely excellent even from a photographed frame obtained by photographing in an environment where the exposure amount is slightly increased. Create a reproduced print photo. It should be noted that the characteristic curve data serving as the basis of the gradation correction is written and registered in advance in an EEPROM or the like built in the image processing circuit 57.

The output unit 51 includes an image memory 60 in which the processed image data from the image processing circuit 57 is written,
Laser unit 6 that outputs blue and green laser beams
1. a driver 62 for controlling the output of the laser unit 61 based on the processed image data in the image memory 60;
It comprises a well-known polygon mirror 63, an Fθ lens 64, a transport mechanism (not shown) for transporting a long color photographic paper 65, and the like.

The output section 51 outputs the color photographic paper 65.
Is conveyed in the longitudinal direction thereof, and is processed by the image processing circuit 57 on the color photographic paper 65 by the main scanning of the laser light by the polygon mirror 63 rotating at a high speed and the sub-scanning by the conveyance of the color photographic paper 65. The exposed color image is exposed. The exposed color photographic paper 65 is cut into one image after development processing to be a print photograph.

Next, the operation of the above configuration will be briefly described. In the photographic film 26b loaded in the film unit with an indoor lens, film information indicating the type used for the film unit with an indoor lens in the manufacturing stage is magnetically recorded on a magnetic data track.
The photographic film 26b on which the film information is recorded is loaded into the main body 20 together with the cartridge 26a. Then, the exposure unit 21, the strobe device 23, the front cover 24, and the rear cover 25 are assembled to the main body 20 to complete the unit main body 2. After the inspection, the label 3 is attached to the unit main body 2, and the film with the indoor lens is attached. The unit is completed. The completed indoor lens-fitted film unit is shipped and used for photographing by the user.

When taking a picture, first, the winding knob 14
Is rotated to wind up the photo film 26b by one frame. Then, a shutter charge is performed in conjunction with the winding. Further, the photographer operates the operation lever 8 as necessary to select whether or not to use strobe light.

For example, when performing flash emission, the operation lever 8 is slid upward to the ON position. Then, the strobe switch 15 is turned on to start charging, and the strobe light emission is allowed. After confirming that the charging is completed, the display light guide 12 illuminates, the shutter button 10 is pressed.

When the shutter button 10 is pressed, the shutter device is operated, and the shutter blade 36 is opened and closed. At this time, when the shutter blade 36 is fully opened, the synchro switch 30 is turned on, and the strobe light is emitted. While the shutter blades 36 are open, the photographing light transmitted through the photographing lens 4 reaches the photographic film 26b via the aperture opening 41a, the shutter opening 38, and the aperture 20c, and the photographic film 26b is exposed. At this time, for example, when an image is taken indoors, a subject (main subject) located at a shooting distance of about 3 m has an illumination effect of strobe light, and is exposed using the strobe device 23 as a light source. The subject (background) farther than that has no illumination effect of the strobe light, and is exposed to the photographic film 26b using indoor lighting, for example, a fluorescent lamp as a light source.

In this way, shooting is performed for each shooting,
After the photographing of all the photographing frames is completed, the user rotates the winding knob 14 continuously to store all the photographic films 26b in the cartridge 26a. Then, the film unit with the lens is submitted to a developing laboratory or a DPE store.

At a developing station or the like, the photographed film cartridge 26 having been photographed is taken out of the unit body 2. The taken out photo film cartridge 26 is separated from the photo film 26b by pulling out the photo film 26b from the cartridge 26a. Then, the photographic film 26b is subjected to a predetermined developing device and developed, and then stored again in the cartridge 26a, and then set together with the cartridge 26a in the digital printer. When the cartridge 26a is set, the digital printer pulls out the developed photographic film 26b and conveys the leading end thereof toward the scanner 54.

During the transport, the film information and the like are read by the magnetic head 52 and the photo sensor 53 from the magnetic data track provided on the leading end side of the photographic film 26b or the bar code that has been revealed, and are decoded by the controller 58. The controller 58 controls the image processing circuit 57 based on the decoded film information.

As shown in FIG. 5, the controller 58 checks the type of the currently set photographic film from the film information read from the magnetic data track, and sends the photographic film type to the film unit with an indoor lens. It is determined whether or not it is used.
Since the photo film 26b in this case is for a film unit with an indoor lens, the controller 58 is used.
Switches the control so that gradation correction is performed on the photographic film 26b that has started the processing, in addition to the normal image processing such as color correction.

When the first photographing frame is set on the film carrier of the scanner 54, the CCD is activated.
Thereby, the image of the first photographed frame is read,
The data is written to the image memory 56 as image data of three colors via the A / D converter 55. Thereafter, the image processing circuit 57
Reads image data from the image memory 56,
The controller 58 gives an instruction based on the result of reading the film information to the image processing circuit 57.

In response to this instruction, the image processing circuit 57 first performs gradation correction on the image data of the first photographed frame. The image processing circuit 57 stores in advance the data of the red, green and blue characteristic curves of the photographic film 26b, and the image processing circuit 57 performs processing on the photographic film 26b for the low density area based on the data. The value of the image data of each color in the low-density region is corrected so that the foot portion of the characteristic curve becomes a straight line extending from the straight line portion.

FIG. 6 shows the red (R),
As shown in an example of the characteristic curves of green (G) and blue (B), the density of the foot of the characteristic curve of each color continuously changes with the change of the exposure amount, but the increase rate is not constant. It is represented by a curve in which the rate of increase gradually increases with an increase in the amount of exposure. Then, the image processing circuit 57 performs the gradation correction process on the image data in the low-density region so that the curve of the foot portion becomes a straight line extending from the straight line portion as indicated by a dashed line. . Accordingly, in a case where the image is taken in an environment where the exposure amount is slightly insufficient, the color photographic paper 65
Even when printing is performed by shifting the density area to be exposed to the low density side so as to include the density area of the foot, the tone portion of the image corresponding to the foot is well reproduced in a printed photograph.

Similarly, by correcting the value of the image data of each color in the high-density region, the color photographic paper 65 may be used in a case where the photographing is performed in an environment where the exposure amount is slightly increased.
Even when the density region to be exposed is shifted to the high density side so as to include the density region of the shoulder portion, the gradation portion corresponding to the shoulder portion can be reproduced well on the printed photograph.

After performing the gradation correction as described above, the image processing circuit 57 performs the normal processing on the image data, and then outputs the processed image data of three colors. Is written to the image memory 60. At the time of this normal processing, the image processing circuit 57 performs, based on the image data,
Which density range of the image on the photo film 26b is to be appropriately reproduced on the print photo, and the type and degree of color correction are determined, and image processing is performed based on this.

When the processed image data is written into the image memory 60, the laser unit 61 is driven by the driver 62 based on the image data. Thus, the color image of the first photographed frame is recorded on the color photographic paper 65 as a latent image. In the same manner, the image of each photographed frame is read by the scanner 54, subjected to image processing by the image processing circuit 56, and then recorded on the color photographic paper 65 as a latent image.

The portion of the color photographic paper 65 exposed as described above is sent to a color development processing step, where development, fixing, drying, etc. are performed, and then the image is cut for each image, and a digital printer is used. Is printed out as a print photo. The obtained print photo is given to the user together with the photo film 26b.

[0086]

DESCRIPTION OF THE PREFERRED EMBODIMENTS "First Embodiment"
Table 4 below shows the specifications of the film unit with a screw. What
Table 4 and each table of the following second to third examples and comparative examples
Inside, the system sensitivity was “2 log_Two
(A) + log_Two(T) -log_Two(0.3 · S) ”
And a^*, B^*Illuminates the fluorescent light according to the above procedure
Expose the standard reflector as
Chromaticity of measured standard reflectors in CIELAB
It is a Knackness index. Also, this chromaticness finger
Number a ^*, B^*When measuring the
Print photo creation using commercially available color photographic paper
are doing.

[0087]

[Table 4]

The photographic film 26b is provided in Japanese Patent Application No. 10-11 / 1990.
As described in Japanese Patent No. 1196, a layer having a fourth photosensitive emulsion layer having sensitivity to light near 520 nm was provided between a green photosensitive emulsion layer and a red photosensitive emulsion layer. This photo film 26
The measured spectral sensitivity of b is as shown in the graph of FIG.

Further, the strobe device 23 is connected to the protector 7
The spectral energy was adjusted by providing a dye filter in front of a. The spectral energy is as shown in the graph of FIG.

As can be seen from Table 4, the film unit with an indoor lens of the first embodiment satisfies the conditional expression of item 1, the conditional expression of item 2, and the conditional expression of item 2. Further, since the ISO sensitivity is “800”, the condition of ISO 640 or more of item 3 is satisfied. Further, the condition (2) of item 4 is satisfied.

In the first embodiment, the depiction of a main subject using strobe light as a light source and the depiction of a background using indoor illumination as a light source are extremely excellent in printed photographs, and the indoor photography is performed. It was suitable for. Further, although the aperture value A is relatively small, the range where the focus is matched is a level that can be sufficiently satisfied in indoor photographing. Furthermore, the photographic film 26b has an excellent light source,
If the light source color of fluorescent light is faithfully reproduced, but the primary color of the strobe light is set to slightly yellow, the fluorescent light and the object illuminated by it are exposed simultaneously as the background of the main subject. However, the main subject can reproduce extremely good colors.

The ON / O of the strobe switch 15 is added to the film unit with the indoor lens of the first embodiment.
By providing an adjustment switch that switches the aperture value, shutter speed, and guide number according to the FF as shown in Table 5 below, from the daylight outdoor backlight scene to a museum-like scene where strobe photography cannot be performed indoors like a museum , Shooting in a wide range of scenes became possible. Table 5
The units of the middle shutter speed and the guide number are “second” and “ISO100 · m”, respectively.

[0093]

[Table 5]

[Second Embodiment] The specifications of the film unit with an indoor lens in the second embodiment are shown in Table 6 below.

[0095]

[Table 6]

The photographic film 26b is different from the first embodiment in that it is prepared by a conventional method without a fourth photosensitive emulsion layer. The measured spectral sensitivity of this photographic film 26b is as shown in the graph of FIG. The spectral energy of the strobe light emitted from the strobe device 23 is as shown in the graph of FIG.

As can be seen from Table 6, the film unit with an indoor lens of the second embodiment satisfies the conditional expression of item 1 and the conditional expression of item 2 respectively. Further, since the ISO sensitivity is “3200”, the condition of the item 3 of ISO sensitivity of 1000 or more is satisfied. Further, both conditions (1) and (2) of item 4 are satisfied.

The second embodiment is an example in which an ultra-high sensitivity film of ISO 3200 is used as the photographic film 26b, and the spectral sensitivity of the photographic film 26b is set with the highest priority on the ISO sensitivity so that the overlap between the colors is minimized. Designed to be less. This ultra-sensitive photo film 26b
By using the above, it is possible to select an aperture value for obtaining a sufficient depth of field and a shutter speed with almost no occurrence of camera shake under any shooting conditions. In addition, the primary colors of the strobe light are optimized for good color reproduction under all shooting conditions, and even if the fluorescent lamp and the object illuminated with it are exposed simultaneously as a background, there is almost no problem. No color reproduction is possible.

[Third Embodiment] The specifications of the film unit with an indoor lens in the third embodiment are shown in Table 7 below.

[0100]

[Table 7]

As can be seen from Table 7, the film unit with an indoor lens according to the third embodiment satisfies the conditional expression of item 1 and the conditional expression of item 2. Further, since the ISO sensitivity is “2000”, the condition of the item 3 of ISO sensitivity of 1000 or more is satisfied. Further, the conditions (1) and (2) of item 4 are satisfied.

The photographic film 26b is provided with a fourth photosensitive emulsion layer in the same manner as in the first embodiment, but is slightly softer than a normal color negative type photographic film.
The latitude is widened by about 0.6 in logarithm of the exposure amount (log E). At the same time, the data of the characteristic curve of the photographic film 26b is registered in the digital printer, and the gradation is corrected.

As a result, under Ev (equivalent to ISO 100) photographing conditions of about 5.0 to 16.5, it was possible to produce a print photograph with good tone reproduction and color reproduction. That is, a good print photograph could be created by the gradation correction by the digital printer even under the photographing conditions of underexposure and overexposure.

A comparative experiment was conducted using the film unit with an indoor lens of the third embodiment and a conventional film unit with a lens. The specifications of the conventional film unit with a lens used as a comparative example are as shown in Table 8 below, and it is possible to perform shooting in Ev9 to Ev16.

[0105]

[Table 8]

In the comparative experiment, Ev2 was used by using the film units with lenses of the third embodiment and the comparative example.
2 for indoor and night (using strobe) with a brightness of ~ 9.5
After shooting 00 scenes and 50 daytime outdoor scenes with brightness of 8.5 to 15.7 Ev, and developing the photographic film 26b, create a color print photo with a digital printer that performs the above gradation correction. did. As a result, in the film unit with an indoor lens according to the third embodiment of the present invention, it is possible to obtain a print photograph in which the main subject and the background are reproduced at an appropriate density in any scene,
The color reproduction was also very good. On the other hand, in the conventional film unit with a lens used as a comparative example, a printed photograph created by photographing indoor and night scenes had a dark background with a conspicuous dark impression as a whole. In addition, there were some printed photographs in which the gradation of the person was lost and flying white.

Further, using the print photographs obtained from the film units with lenses as described above, print photographs of the same scene are presented, and it is determined which of the film units with lenses is preferable. Sensory evaluation was performed on 20 subjects as selected. The results are as shown in Table 9 below. The print photograph obtained from the film unit with an indoor lens according to the present invention obtained overwhelmingly higher support. From these results, it can be seen that the film unit with the lens and the print photo creating method of the present invention can provide a user with a preferable print photo.

[0108]

[Table 9]

[0109]

As described above, according to the film unit with the lens of the present invention, the shutter speed of the shutter device, the aperture value of the aperture, the ISO sensitivity of the photographic film, and the guide number of the strobe device are set to predetermined values, or Because the combination satisfies the specified conditions, even when shooting indoors or outdoors at night, print photographs with good tone reproducibility, color reproducibility, and good density ratio between the main subject and the background can be obtained. Can be created. Also, when a print photograph is created from a photographic film obtained from such a film unit with a lens, the gradation of the image corresponding to the foot of the characteristic curve is changed by the digital image processing so that the linear portion of the characteristic curve of the photographic film is changed. Since the correction is performed so as to be extended to the low density range, a print photograph with extremely good tone reproduction and color reproduction can be created even when photographing is performed under a brightness where the exposure amount is somewhat insufficient.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an exploded view of a film unit with a lens embodying the present invention.

FIG. 2 is an external view of a film unit with a lens.

FIG. 3 is an exploded perspective view showing an exposure unit.

FIG. 4 is a block diagram illustrating a configuration of a digital printer.

FIG. 5 is a flowchart illustrating a processing procedure of the digital printer.

FIG. 6 is a graph showing an example of a characteristic curve of a photographic film.

FIG. 7 is a graph showing the spectral sensitivity of the photographic film in the first embodiment.

FIG. 8 is a graph showing the spectral energy of strobe light in the first embodiment.

FIG. 9 is a graph showing the spectral sensitivity of the photographic film in the second embodiment.

FIG. 10 is a graph showing the spectral energy of strobe light in the second embodiment.

[Explanation of symbols]

 Reference Signs List 4 photographing lens 7 strobe light emitting unit 23 strobe device 26b photographic film 36 shutter blade 41 aperture plate 54 scanner 57 image processing circuit

Claims (12)

[Claims] 1. A film unit with a lens provided with a photographing mechanism having a photographing lens, a shutter device, and an aperture, and in which an unexposed photographic film is loaded in advance, wherein the shutter speed of the shutter device is T seconds, the shutter speed of the aperture is When the aperture value is A and the ISO sensitivity of the photographic film is S, −6 ≦ 2 log ₂ (A) + log ₂ (1 / T) −log ₂ (0.3 ·
S) A film unit with a lens, characterized in that photographing is enabled by an ISO sensitivity, a shutter speed and an aperture value satisfying a conditional expression of ≦ 5. 2. A film unit with a lens provided with a photographing mechanism having a photographing lens, a shutter device, and an aperture, in which an unexposed photographic film is loaded in advance. When the aperture value is A and the ISO sensitivity of the photographic film is S, -2 ≦ 2 log ₂ (A) + log ₂ (1 / T) -log ₂ (0.3 ·
S) A film unit with a lens, characterized in that photographing is enabled by an ISO sensitivity, a shutter speed and an aperture value satisfying a conditional expression of ≦ 4. 3. A strobe device for irradiating a subject with strobe light, the strobe device being capable of emitting light with a guide number of 0.1 to 8 (ISO 100 · m). The film unit with a lens according to claim 1. 4. A strobe device for irradiating a subject with strobe light, wherein the strobe device is capable of emitting light with a light amount in a guide number range of 0.1 to 6 (ISO 100 · m). The film unit with a lens according to claim 1. 5. A strobe device for irradiating a subject with strobe light, wherein when a guide number of the strobe device is G (ISO100 · m), 7.0 ≦ log ₂ (G ² ) + log ₂ ( The lens-equipped film unit according to claim 1, wherein the following conditional expression is satisfied: 1 / T) ≦ 12.0. 6. The guide number of the strobe device is G
The lens with the lens according to claim 3 or 4, wherein when (ISO100 · m), a conditional expression of 7.0 ≦ log ₂ (G ² ) + log ₂ (1 / T) ≦ 12.0 is satisfied. Film unit. 7. A lens-equipped film unit, comprising: a photographing mechanism having a photographing lens and a shutter device; and a strobe device for irradiating a subject with strobe light, wherein an unexposed photographic film is loaded in advance. When the shutter speed of the shutter device is T seconds and the guide number of the strobe device is G (ISO100 · m), the condition of 7.0 ≦ log ₂ (G ² ) + log ₂ (1 / T) ≦ 12.0 is satisfied. A film unit with a lens that satisfies the formula. 8. The photographic film has an ISO sensitivity of 64.
The film unit with a lens according to any one of claims 1 to 7, wherein the number is 0 or more. 9. The photographic film has an ISO sensitivity of 10
The film unit with a lens according to any one of claims 1 to 7, wherein the number is not less than 00. 10. Irradiating strobe light toward a subject
It has a strobe device, and uses this strobe device as a light source
Appropriately expose a gray reflector with an emissivity of 18% to the above photo film.
Glow on the print photo created from this photo film
The color of the gray reflector is measured under illumination with standard light D65.
CIE 1976 L ^*a^*b^*Color space
Chromaticity index a in^*, B^*Is each
A print condition of “0” was obtained, and JIS Z 8719
The F6 type fluorescent lamp specified in
-Exposure of the reflector to the photographic film properly
Photographs created from ILM under the above printing conditions
The color of the gray reflector above is illuminated with standard light D65
CIE 1976 L obtained when measured with ^*a^*
b^*Chromaticity index a in color space^*, B^*
Satisfies either of the following conditions (1) and (2):
Spectral energy of strobe light and spectral sensitivity of photographic film
3. The method according to claim 1, wherein
The described film unit with lens. Condition (1) “0 ≦ √ ((a^*)^Two+ (B^*)^Two) ≦ 5.0 ”Condition (2)“ 0 ≦ √ ((a^*)^Two+ (B^*)^Two) ≦ 15.0 and 0 ° ≦ Y ≦ 100.0 ° ”or“ 0 ≦ √ ((a^*)^Two+ (B^*)^Two) ≦ 15.0 and 210 ° ≦ Y ≦ 360.0 ° where a^*= 0 and b^*= 0 when Y = 0 ° a^*$ 0 and b^*When ≠ 0, Y = tan^-1(B^*/
a^*) And a^*≧ 0, b^*0 ° ≦ tan when ≧ 0^-1(B^*/
a^*) ≦ 90 ° a^*≤0, b^*90 ° ≦ tan when ≧ 0^-1(B^*/ A
^*) ≦ 180 ° a^*≤0, b^*180 ° ≦ tan when ≦ 0^-1(B^*/
a^*) ≦ 270 ° a^*≧ 0, b^*270 ° ≦ tan when ≧ 0^-1(B^*/
a^*) 360 ° 11. A gray reflector having a reflectance of 18% is appropriately exposed to the photographic film using the strobe device as a light source, and the color of the gray reflector on a printed photograph created from the photographic film is determined by standard light D65. When measured under illumination, the printing conditions under which the chromaticity indices a ^* and b ^* in the CIE 1976 L ^* a ^* b ^* color space are each “0” are obtained, and JIS Z 8719
Using the F6 type fluorescent lamp as a light source, the gray reflection plate is appropriately exposed to the photographic film, and the color of the gray reflection plate on a print photograph created under the printing conditions from the photographic film is changed to a standard. CIE 1976 L ^* a ^* obtained when measured under illumination with light D65
chromaticity index a ^* , b ^* in b ^* color space
Satisfies either of the following conditions (1) and (2):
10. The method according to claim 3, wherein the spectral energy of the strobe light and the spectral sensitivity of the photographic film are determined.
The film unit with a lens according to any one of the above. Condition (1) “0 ≦ √ ((a ^* ) ² + (b ^* ) ² ) ≦ 5.0” Condition (2) “0 ≦ √ ((a ^* ) ² + (b ^* ) ² ) ≦ 15. 0 and 0 ° ≦ Y ≦ 100.0 ° ”or“ 0 ≦ √ ((a ^* ) ² + (b ^* ) ² ) ≦ 15.0 and 210 ° ≦ Y ≦ 360.0 ° ”where a ^{When *} = 0 and b ^* = 0, Y = 0 ° When a ^* tan0 and b ^* ≠ 0, Y = tan ⁻¹ (b ^* /
a ^* ), and when a ^* ≧ 0 and b ^* ≧ 0, 0 ° ≦ tan ⁻¹ (b ^* /
a ^* ) ≦ 90 ° When a ^* ≦ 0 and b ^* ≧ 0, 90 ° ≦ tan ⁻¹ (b ^* / a
^* ) ≦ 180 ° 180 ° ≦ tan ⁻¹ when a ^* ≦ 0 and b ^* ≦ 0 (b ^* /
a ^* ) ≦ 270 ° When a ^* ≧ 0 and b ^* ≧ 0, 270 ° ≦ tan ⁻¹ (b ^* /
a ^* ) ≦ 360 ° 12. When a print photograph is created using a photographic film obtained from the film unit with a lens according to claim 1, the linear portion of the characteristic curve of the photographic film has a low density. A print image forming method for correcting the gradation of an image read from the photographic film corresponding to a foot portion of a characteristic curve by digital image processing so as to be extended to an area.