JPH0540301A - Camera and color print system - Google Patents

Abstract

PURPOSE:To reproduce the hue of a subject, which is observed through a finder, faithfully on a color print photograph. CONSTITUTION:Light from the subject passes through a photographic lens 3 along an optical axis 3a and is reflected by a mirror 10 and imaged on focus glass 15. The subject image formed on the focus glass 15 is observed through a lens 16, a pentagonal prism 17, a filter disk 20, and a finder ocular 21. When the mirror 10 is rotated to a position shown in a figure by an alternate long and short dash line at the time of photography, the light passing through the photographic lens 3 is imaged on a color film 13. At this time, an LED 34 writes data on the rotation position of the filter disk 20 on the color film 13. The subject imaged on the focus glass can be observed while changed in hue by rotating the color disk. Further, the kind of the filter inserted into the finder optical axis is recorded on the color film, so this can be referred to at the time of printing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera and a color print system for obtaining a color print photograph in which an object is reproduced in a desired color.

[0002]

2. Description of the Related Art A color print photograph is produced by printing a negative image imprinted on a color film on photographic paper.
Since the camera faithfully reflects the color of the subject on the color film, the colors of the negative images are different when the color temperature of the illumination light is different even for the same subject. Therefore, if the negative image is printed on the printing paper without color correction, the color tone of the color print photograph is not intended by the photographer. For this reason, a negative image is tested for each frame when printing is performed, and the color tone of the color print photograph is corrected to make it desirable for the photographer. By the way, there is a problem in that the negative test is troublesome and requires skill. In order to solve this problem, the color temperature of the illumination light at the time of shooting is measured, the result is recorded in a color film, and this is read out at the time of printing, so that the camera and its The camera system is described in JP-A 1-280730, 1-280731, 1-280732, and 1-280733.

[0003]

However, the color temperature measured by the above-mentioned conventional camera is such that the color balance of the photographing area, for example, the back of the main subject is a red brick fence, and the area ratio of the brick fence to the photographing area is large. Is larger than the color temperature of the illumination light. If color correction is performed based on the measurement result and a negative image is printed on a printing paper, there is a problem that the color of the main subject does not have the hue intended by the photographer. The present invention provides a camera and a color print system that faithfully reproduce the color tone of a subject confirmed by a finder in a color print photograph.

[0004]

In order to achieve the above object, the present invention is directed to a camera according to claim 1 in which a color filter for correcting the color of an object observed by a finder, and the color filter is placed on the optical axis of the finder. A switching means for putting in and out and a writing means for detecting the kind of the color filter inserted on the optical axis of the finder and writing this on the recording medium are provided. In addition, the writing means, during flash photography,
The writing is blocked. In the camera according to the third aspect, a color filter is inserted also on the photographing optical axis in correspondence with the color filter for correcting the color of the object observed by the finder. It should be noted that the color filter on the photographing optical axis is retracted during stroboscopic photography. Further, in the viewfinder of the camera, as a reference when selecting a color filter, a color plate displaying a standard color is provided separately from the subject image.

According to a sixth aspect of the present invention, in a color printing system, a color film having a red-sensitive, green-sensitive and blue-sensitive photosensitive material layer photographed by the above-mentioned camera is developed, and a color filter at the time of photographing recorded for each frame. The color of the negative image is corrected with reference to the type of No. 1 and printed on a color print material that forms cyan, magenta, and yellow dyes so that the color reproduction index is 70% or more and the Bizecky index is 10 or less. There is.

[0006]

FIG. 4 shows the first embodiment of the camera of the present invention. On the front surface of the camera 2, a taking lens 3 and a strobe light emitting section 4 are provided. Further, on the upper surface of the camera 2, there are provided a release button 5, a color correction button 6, which will be described later in detail, and a finder section 8 having a finder eyepiece frame 7 formed behind it. In addition, the reference numeral 3a is a taking lens 3
It shows the optical axis of.

FIG. 2 shows a photographing optical system and a finder optical system of the camera. Behind the taking lens 3, a mirror 10 tilted by 45 degrees with respect to the optical axis 3a is provided. The light passing through the taking lens 3 is mirror 10
Is reflected in the finder optical axis 12 direction. Further, since the mirror 10 is rotated to the position shown by the alternate long and short dash line in the drawing and retracts from the photographing optical axis 11, the light passing through the photographing lens 3 at this time is the color arranged on the photographing optical axis 11. An image is formed on the film 13.

A focus glass 15 on which the light reflected by the mirror 10 forms an image is arranged on the finder optical axis 12. A lens 16 and a pentaprism 17 are provided above the focus glass 15. Behind the pentaprism 17, a filter disc 20 for performing color correction of the finder optical system is provided. The light that has passed through the filter disc 20 is observed through the finder eyepiece lens 21 held by the finder eyepiece frame 7. This filter disc 2
A color plate 22 showing a standard color such as flesh color or gray is provided between 0 and the viewfinder eyepiece lens 21.
This color plate 22 is a viewfinder field frame 23 indicated by a broken line in FIG.
Observed below. The color plate 22 has a color temperature of, for example, 5500 degrees K so that the color plate 22 can always be observed with a constant hue.
It is illuminated with the illumination light. Further, reference numeral 24 denotes a target mark written on the focus glass 15.

FIG. 1 shows a main part of the camera of the present invention. The filter disc 20 is divided into four regions as shown. The filter disc 20 is made of transparent optical glass, and three regions of the filter disc 20 are coated with different thin films.
a to 20c. For example, the filter 20a has a color temperature of 28
The light of 00 degree K is converted into the light of color temperature 5500 degree K by the filter 2
0b converts light having a color temperature of 3300 degrees K into light having a color temperature of 5500 degrees K, and the filter 20c converts light having a color temperature of 6500 degrees K into light having a color temperature of 5500 degrees K. That is, when an object illuminated with a tungsten bulb is observed through the filter 20a, it looks as if it were illuminated with daylight of 5500K. Also filter 20
When a subject illuminated by a fluorescent lamp is observed through b, it can be observed as if it were illuminated by daylight of 5500 degrees K. Furthermore, when a subject such as a beach or a ski resort is observed through the filter 20c, it can be observed as if it was illuminated by daylight of 5500 degrees K.

When the filter disk 20 is rotated by 90 degrees in the direction of the arrow by the motor 25, one of the transparent glass and the filters 20a to 20c is inserted on the finder optical axis 12. The motor 25 is controlled by a microcomputer 27 that controls the sequence of the camera 2 via a motor drive unit 26. A detection piece 28 to which an aluminum foil is attached is integrally formed in a region corresponding to the filter 20b. The detection piece 28 is a reflection type position sensor 2
Detected at 9. The position sensor 29 is connected to the microcomputer 27, and the microcomputer 27 can confirm the origin position of the filter disc 20 facing the position sensor 29 by the detection piece 28 based on the detection signal from the position sensor 29. In this embodiment, 360 degrees is divided into 90 degrees, for example, "1" when a transparent glass is inserted on the finder optical axis 12, "2" when the filter 20a is inserted, and the filter 20b is inserted. The microcomputer 27 is made to grasp the rotational position of the motor 25 by the numbers "1" to "4" such as "3" when the filter is inserted and "4" when the filter 20c is inserted.

A signal generator 32 that outputs a release signal to the microcomputer 27 when the release button 5 is pressed, a signal generator 33 that outputs a switching signal when the color correction button 6 is pressed, and the 7-segment LED 34 emits light. A light emission control unit 35 and the like for controlling the are connected. In addition,
The flash 27 is connected to the microcomputer 27 via a flash switch 36.

Here, the sequence control performed by the microcomputer 27 will be briefly described. When the microcomputer 27 is powered on, the motor 25 is driven via the motor drive unit 26.
To rotate the filter disc 20 to the origin position. After that, when the switching signal is output from the signal generator 33,
The microcomputer 27 receives the motor 25 via the motor drive unit 26.
Are rotated by 90 degrees in the direction of the arrow. When the release signal is output from the signal generator 32, the microcomputer 27 causes the number "1" to correspond to the rotational position of the filter disk 20.
“4” is sent to the light emission control unit 35, the LED 34 is caused to emit light, and any one of the numbers “1” to “4” is printed on the upper portion of the color film 13. In this embodiment, the type of the filter used at the time of photographing is optically recorded in the color film 13, but the film may be magnetically recorded by providing a magnetic layer. Although the type of the filter is recorded in the color film 13 in the above embodiment, it may be written in a memory provided in the cartridge or a memory cartridge mounted in the camera.

The microcomputer 27 has a strobe switch 36.
When is pressed, the motor 25 is rotated via the motor drive unit 26 to rotate the filter disc 20 to the origin position. After that, when the release signal is output from the signal generator 32, the microcomputer 27 drives the strobe light emitting unit 4 in synchronization with the opening of the shutter, but does not cause the LED 34 to emit light.

The operation of the camera configured as described above will be described. When the power of the camera 2 is turned on, the microcomputer 27 turns the filter disc 20 to the origin position via the motor 25, and inserts the transparent glass on the finder optical axis 12. When the subject is illuminated with, for example, a tungsten light bulb, the color tone of the subject observed in the viewfinder field frame 23 becomes reddish as a whole, so the color correction button 6 is pressed. As a result, when a switching signal is sent from the signal generator 33 to the microcomputer 27, the microcomputer 27
When the motor 25 is rotated 90 degrees and the filter disc 20 is rotated ¼ in the direction of the arrow, the filter 20a is inserted on the finder optical axis 12. The tint of the subject is reddish by the filter 20a, which is preferable. It should be noted that when selecting a preferable shade, for example, when the subject is a person, the skin color of the color plate 22 is referred to.

When the release button 5 is pressed in this state, the microcomputer 27 opens and closes a shutter (not shown) to perform exposure, and at the same time, causes the LED 34 to emit light via the light emission control section 35, and the number "" is displayed above the color film 13. 2 ”is imprinted. Further, when photographing at a ski resort or the like, the color correction button 6 is pressed to bring the filter 20c into the viewfinder optical axis 12.
Insert on top. As a result, the bluish tint is reduced, and the hue of the subject observed in the viewfinder frame 23 becomes favorable. When the release button 5 is pressed in this state, the number "4" is imprinted on the upper portion of the color film 13. As described above, in the camera of the present invention, it is possible to switch the filters to check the preferable color tone of the subject and shoot, and by recording the type of the used filter in the color film 13 for each frame to be printed. The examiner can be informed of the color temperature of the light that illuminates the subject.

By the way, when the color film 13 is a daylight type, the color tone of the color print photograph taken under the illumination light of the color temperature of 5500 degrees K is good, but the color of the other color temperature is not. Since the color tone of a color print photograph taken under illumination light is different from that intended by the photographer, when the color film 13 is printed by a conventional printing method, it is observed in the viewfinder frame 23 on the color print photograph. It is not possible to faithfully reproduce the shades that have been used.

The color print system of the present invention for faithfully reproducing the color tone observed in the finder field frame 23 in a color print photograph will be described below. The developed color film 13 is sent to the printer and set at the exposure position. The negative examiner sets the color temperature of the printing light by referring to the numbers printed on the upper part of each frame, and prints. For example, when the number is "1", the color temperature of the printing light is 5500 degrees K, when the number is "2", the color temperature of the printing light is higher than this, and when the number is "3", the color temperature of the printing light is the number "1". Between "2" and "2", and when the number is "4", the color temperature of the printing light is set to be lower than 5500 degrees K. The color film 13 is composed of a red-sensitive, green-sensitive, and blue-sensitive silver halide emulsion layer. The photographic paper is a photographic paper formed with cyan, magenta and yellow dyes, and has a color reproduction index of 7
Keep it at 0% and keep the Bizecky index below 10. By doing so, the color shade observed by the finder eyepiece lens 21 is reproduced in the color print photograph.

The comparison results of color reproducibility between the color printing system of the present invention and the conventional printing system are shown below. A person illuminated by a tungsten bulb having a color temperature of 2800 ° K was used as a subject, and a daylight type color film was used.

[0019]

[Table 1] The examiner is not notified of color temperature information at the time of photographing.

[0020]

[Table 2] Color temperature at the time of shooting 2800 degrees K ---> 5500
The inspector was informed in advance that a filter for converting to degrees K was used.

[0021]

[Table 3] Color temperature at the time of shooting 2800 degrees K ---> 3600
The inspector was informed in advance that a filter for converting to degrees K was used. the above

[Table 1],

[Table 2],

From Table 3, it can be seen that the satisfaction of the color reproducibility is improved when the examiner is given the color temperature information at the time of shooting regardless of whether he is skilled or unskilled.

FIG. 5 is an embodiment showing another camera of the present invention. In this camera 40, the above-mentioned filter disc 20 is provided between the taking lens 3 and the mirror 10.
The filter disc 20 is rotated by a motor 25 which is rotated by pressing the color correction button 6. Therefore, the light from the subject entering the mirror 10 has its color temperature converted by the filter disc 20 inserted on the optical axis 3a. After that, the light reflected by the mirror 10 is observed by the finder eyepiece lens 21. Since the mirror 10 is rotated at the time of photographing, the light passing through the filter disc 20 is imaged on the color film 13. In addition, the filter disc 2
0 converts the light passing through the taking lens 3 into a color temperature of 5500 degrees K. Therefore, if a daylight type is used for the color film 13, the hue of the subject can be best captured. Further, in this embodiment, when the strobe switch 36 is pressed, the motor 25 rotates the filter disc 20 and inserts a transparent glass region on the finder optical axis 12.

A daylight type color film 13 is loaded into the camera 40, a person illuminated by a tungsten light bulb of 2800 degrees K is photographed, and the color reproducibility of a color print photograph printed without correction is satisfied. The degrees are as follows. Satisfaction is 100% when using a filter that converts from 2800 K to 5500 K
Met. On the other hand, 2800 degrees K ---> 3600 degrees K
The degree of satisfaction is 90% when using a filter for converting to. For the subject, the photographer referring to the color plate 22 always selects a filter for converting from 2800 ° K to → 5500 ° K.

[0024]

As described above, in the camera according to the first aspect, the color filters of the subject observed by the finder can be adjusted by switching the color filters, and the type of color filter inserted on the optical axis of the finder can be changed. Can be recorded on the film. Further, in the color print system according to claim 6, since the color temperature of the illumination light at the time of shooting can be estimated from the color filter used at the time of shooting, the hue of the color print photograph should be intended by the photographer. You can Further, in the camera according to claim 3, since the color filter is inserted on the photographing optical axis in correspondence with the color filter inserted on the optical axis of the finder, the color print photograph is not corrected at the time of printing. The shade of can be the one intended by the photographer. In addition, the standard color that is compared with the color of the observed object is displayed in the viewfinder,
The color filter to be corrected can be selected more correctly.

[Brief description of drawings]

FIG. 1 is a block diagram showing a main part of a camera.

FIG. 2 is a schematic diagram showing a photographing optical system and a finder optical system of a camera.

FIG. 3 is a view showing a viewfinder field.

FIG. 4 is a perspective view showing an appearance of a camera.

FIG. 5 is a schematic diagram showing a photographing optical system and a finder optical system of another camera.

[Explanation of symbols]

 Camera 2 Strobe light emission unit 4 Color correction button 6 Finder optical axis 12 Color film 13 Filter disc 20 Filters 20a to 20c Finder eyepiece 21 Color plate 22 Motor 25 Microcomputer 27 Position sensor 29 LED 34

Claims (6)

[Claims] 1. A color filter for correcting the color of an object observed by a viewfinder, a switching means for putting the color filter in and out of the viewfinder optical axis, and a type of the color filter inserted in the viewfinder optical axis. And a writing means for writing the same on a recording medium. 2. The camera according to claim 1, wherein the writing means blocks writing during stroboscopic photography. 3. A switching means for moving a color filter for correcting the color of an object observed by the finder into and out of the finder optical axis, and a color filter corresponding to the switching means when the color filter is inserted in the photographic optical axis. A camera characterized by being inserted. 4. The camera according to claim 3, wherein a color filter is not inserted on the photographing optical axis at the time of stroboscopic photography. 5. The camera according to claim 1, wherein standard colors are displayed in the finder separately from the subject image. 6. A color film having a red-sensitive, green-sensitive and blue-sensitive photosensitive material layer photographed by the camera according to claim 1, developed, and photographed for each frame Correct the color of the negative image with reference to the type of color filter
In order to keep the color reproduction index at 70% or more and the Bizecky index at 10 or less, cyan, magenta,
A color printing system characterized by printing on a color printing material that forms a yellow dye.