JPH0786655B2 - Method of adjusting the imaging device for the simulator - Google Patents

Description

The present invention relates to a method for adjusting an image pickup device for a simulator, and more particularly, to a CRT which is the same image as a finished print processed by printing on photographic paper by a color automatic photoprinting device. The present invention relates to a method of adjusting an image pickup device used for a simulator displayed on the screen.

[Prior Art] Conventionally, the integrated transmission density (LATD) of the entire image of a color negative film is measured to correct the density, and slope control is performed so that the density and color balance of all the finished prints are negative (light exposure). Under, proper exposure,
There is known an automatic color photographic printing apparatus that prints and develops the same image regardless of overexposure. This automatic photoprinter is equipped with a light source, dimming filter, mirror box,
An optical system including a negative carrier and a black shutter is arranged in this order. The color negative film is placed on the negative carrier, the light source is turned on, the brush shutter is opened, and the image of the color negative film is formed on the photographic paper for printing. The printed printing paper is developed in a developing process so that the print is automatically finished. In this automatic photographic printing apparatus, the light rays that have passed through the negative film are red light (R), green light (G), and blue light (B) by the light receiving element.
The primary colors are separated, and the density is controlled using LATD based on Evans' theorem, and the color balance is controlled by performing slope control so that the slopes match in the three primary colors. Therefore, according to this automatic photographic printing apparatus, all of the normal finished prints have the same density and color balance.

However, even if the main subject of the color negative film has an appropriate density, if the background density is high or low,
Since the exposure amount is controlled under the influence of the density of the background, a density area is generated. In addition, when the color balance of the main subject and the color balance of the background are different, for example, when the color of the main subject and the color of the background have a complementary color relationship, a color hue area occurs. Therefore, the finished state of the print may be deteriorated even if the density correction or the slope control is performed. In this way, when the finished state of the print is deteriorated, it is necessary to perform print development again.

For this reason, conventionally, as disclosed in Japanese Patent Laid-Open No. 53-46731, a color video image is produced so that a negative film image is picked up by a TV camera and the desired density and color balance are obtained while displaying the image on a TV screen. So-called photographic proofing devices are used which condition the signal and use this color video signal for printing in automatic photographic printing machines. Also, as shown in Japanese Examined Patent Publication No. 42-25220, there is also one in which an image of a negative film printed on photographic paper is displayed on a TV screen and an automatic exposure device and a bright and contrast adjusting resistor of the TV are linked. is there. In this way, the frequency of the re-baking development process is reduced.

[Problems to be solved by the invention]

However, in the method using the inspection device, since the light source of the inspection device and the light source of the automatic photographic printing device are separate bodies, the light source of the light source is There is a problem that the same image as the image displayed on the TV screen cannot be printed due to changes or the like. In addition, in the case where the automatic exposure device and the brightness and contrast adjustment resistance of the TV are linked together, the TV color development characteristics and the color development characteristics of the photographic paper are different,
There is a problem that only the TV signal is controlled so that a proper image is displayed on the screen, and the same image as printed is not displayed on the TV screen.

For this reason, the applicant has previously proposed a simulator capable of displaying the same image as the finished print. However, when the negative size changes, the mirror box of the automatic photoprinter is replaced and the magnification of the optical system also changes, so
The amount of light to the simulator changes. Therefore, the brightness sensitivity of the simulator must be changed accordingly. In the previously proposed simulator, the aperture or gain of the camera is manually switched every time the negative size changes, which is troublesome.

The present invention has been made to solve the above problems, and it is possible to display the same image as a finished print and to automatically adjust the sensitivity of brightness according to the negative size in accordance with the change in the negative size. It is an object of the present invention to provide a method of adjusting an imaging device for a simulator capable of performing the above.

[Means for solving problems]

To achieve the above object, a first invention is to form a light source system for illuminating a color negative film with a light beam, and to form a negative image recorded on the color negative film on a photographic paper arranged on the light transmitting side of the color negative film. Optical system to
In an automatic photoprinting apparatus equipped with an automatic exposure control function for dimming the light source system so that the finished prints have the same tint and density, the light is adjusted by the automatic exposure control function of the automatic photoprinting apparatus. A negative image recorded on the color negative film illuminated by the light source system,
Negative size in adjusting the image pickup device of the simulator, which captures an image by using an image pickup device that decomposes the received light rays into three primary colors and outputs as an electric signal corresponding to the three primary colors, and converts the output of the image pickup device to display as a positive image , The gain of the adjusted electrical signal is adjusted by adjusting the gain of the electrical signal so that the output of the imaging device corresponds to the density of the reference negative by using the corresponding reference negative. Is stored for each negative size, and the gain is adjusted based on the stored content each time the negative size of the color negative film is changed.

A second invention is a light source system for illuminating a color negative film with a light beam, and an optical system for forming a negative image recorded on the color negative film on a photographic paper arranged on the light beam transmitting side of the color negative film. In an automatic photoprinting apparatus equipped with an automatic exposure control function for dimming the light source system so that the finished prints have the same tint and density, the light is adjusted by the automatic exposure control function of the automatic photoprinting apparatus. The negative image recorded on the color negative film illuminated by the light source system is imaged by using an imaging device that includes a diaphragm mechanism, decomposes the received light beam into three primary colors, and outputs the electrical signals corresponding to the three primary colors. When adjusting the image pickup device of the simulator that converts the output of the image pickup device and displays it as a positive image, it corresponds to each different negative size. By imaging a reference negative by adjusting the throttle mechanism or gain of the electrical signal as the image pickup device output using the quasi-negatives corresponding to the density of the reference negative,
The adjusted position of the diaphragm mechanism or the gain of the electric signal is stored for each negative size, and the diaphragm mechanism or the gain is adjusted based on the stored content each time the negative size of the color negative film is changed. .

[Action]

The automatic photographic printing apparatus used in the present invention is a light source system for illuminating light rays on a color negative film, and an optical system for forming a negative image recorded on the color negative film on a photographic paper arranged on the light ray transmitting side of the color negative film. The system and an automatic exposure control function for adjusting the light source system so that the finished prints have the same tint and density.

The simulator of the first invention uses an image pickup device which does not have a diaphragm mechanism and which separates a received light beam into three primary colors and outputs it as an electric signal corresponding to the three primary colors. The negative image recorded on the color negative film illuminated by the illuminated light source system is imaged, and the output of this imaging device is converted and displayed as a positive image. The output of this image pickup device corresponds to a reference negative created by developing an unexposed film (a so-called blank negative) or a negative in which a yellow-green subject is photographed around a portion corresponding to a negative in which a gray subject is photographed. A plurality of reference negatives having different negative sizes such as a reference negative (so-called eyeball negative) having a portion are output for each negative size so that the brightness becomes a target value and the output of the imaging device corresponds to the color of the reference negative. Is adjusted by adjusting the gain of the electric signal for each negative size. In this way, the brightness reference can be determined by adjusting the brightness by adjusting the gain of the electric signal. For example, when the bare negative is used as the reference negative, all the levels of the electrical signal corresponding to the three primary colors are white level (or 90% of the white level).
%) Is adjusted. Since this transparent negative has the highest light transmittance among all the negatives, the amount of light received by the image pickup device is the largest, and the point of maximum received light is brought close to the saturation point of the image sensor. The dynamic range of the image pickup device can be widely used. Further, for example, when a normal eyeball negative is used as a reference negative, the eyeball negative is imaged by using an image pickup device, and each electric signal is adjusted so as to correspond to each density of the eyeball negative. In this way, the reference level of the camera output can be determined so as to match the gray level by adjusting the output of the image pickup apparatus so as to correspond to each of the density of the negative eye.

The gain of the electric signal adjusted as described above is stored in a non-volatile memory or the like for each negative size. Then, when the negative size of the color negative film to be printed and developed is changed, the stored contents are read according to the negative size of this color negative film, so that it is optimal for the negative size of the color negative film to be printed and developed. The gain of the electrical signal is adjusted. In the case of adjusting the gain of the electric signal as described above, if the light source state of the automatic photoprinting apparatus deviates from the standard state, it is necessary to electrically correct the misaligned state, so that a standard gray color is formed. It is preferred that the negatives be adjusted in a light source condition that produces a standard gray print.

A second aspect of the invention uses an image pickup device having a diaphragm mechanism to adjust the image pickup device as in the first aspect of the invention. Since the image pickup apparatus of the present invention is provided with the diaphragm mechanism, when the diaphragm is selected according to preference and not used for adjustment,
It can be adjusted by adjusting the gain of the electric signal as in the first invention, and when the diaphragm mechanism is used for adjustment, only the diaphragm mechanism is adjusted as in the first invention, or The adjustment of the diaphragm mechanism and the adjustment of the gain of the electric signal are combined to adjust the brightness by the diaphragm and the density by the gain.

〔The invention's effect〕

As described above, according to the present invention, the position of the diaphragm mechanism or the gain of the electric signal is stored in advance for each negative size, and when the color negative film to be printed on the printing paper is changed, each print is printed. The position of the diaphragm mechanism or the electric signal based on the stored contents so as to correspond to the reference negative corresponding to each negative size of the negative image illuminated by the light source system in which the tint and the density according to the characteristics of Since the gain of the photographic paper is adjusted, the output standard of the image pickup device can be easily set even if the characteristics of the photographic paper are different or the negative size of the color negative film to be printed is changed. The effect that it is possible to easily match the image to be printed with the image of the finished print can be obtained.

[Description of mode]

The present invention can adopt the following aspects in adjusting the imaging device.

In the first aspect, an image capture device that does not include a diaphragm mechanism is used to capture an image of a transparent negative image, the gain of an electrical signal output from the image capture device is adjusted, the brightness is adjusted, and all the output of the image capture device is adjusted. The adjustment is made so that the value corresponds to the white level.

In the second aspect, an eyeball negative is imaged by using an imaging device that does not include a diaphragm mechanism, the gain of an electric signal output from the imaging device is adjusted, the brightness is adjusted, and all the outputs of the imaging device are eyeballs. The adjustment is made so that a predetermined level is obtained that is the same as the negative print finish.

In the third aspect, an image pickup device having an aperture mechanism is used to image a bare negative image, the gain of an electric signal output from the image pickup device is adjusted to adjust the brightness, and all the output of the image pickup device is white. It is adjusted so that the value corresponds to the level.

According to a fourth aspect, an eyeball negative is imaged by using an imaging device having a diaphragm mechanism, the gain of an electric signal output from the imaging device is adjusted to adjust the brightness, and at the same time, all of the imaging device outputs are eyeball negatives. The print level is adjusted so that the print finish is the same.

In a fifth aspect, an image capture device having an aperture mechanism is used to capture an image of a transparent negative image, the aperture mechanism is adjusted to adjust the brightness, and all the outputs of the image capture device have values corresponding to the white level. To adjust to.

In a sixth aspect, the eyeball negative is imaged by using an imaging device having a diaphragm mechanism, the diaphragm mechanism is adjusted to adjust the brightness, and all the outputs of the imaging device are the same as the print finish of the eyeball negative. It is to adjust to the level.

In a seventh aspect, an image pickup device having an aperture mechanism is used to capture an image of a transparent negative image, the aperture mechanism is adjusted to adjust the brightness, and the output of the image pickup device is set to a value corresponding to a white level. In addition, the gain of the electric signal output from the image pickup device is adjusted.

In the eighth aspect, an image of an eyeball negative is imaged by using an imaging device having an aperture mechanism, the brightness is adjusted by adjusting the aperture mechanism, and at the same time, all the outputs of the imaging device are the same as the print finish of the eyeball negative. The gain of the electric signal output from the image pickup device is adjusted so that the level becomes a level.

Then, the position of the diaphragm mechanism and the gain of the electric signal adjusted as described above are stored for each negative size and adjusted as described above.

〔Example〕

Hereinafter, a simulator to which the present invention is applicable will be described in detail with reference to the drawings.

As shown in Fig. 1, a light source composed of a halogen lamp
A reflecting mirror 12 composed of a cold mirror is arranged on the back side of 10. The light source 10 is supplied with a voltage of approximately 90% of the rated voltage from a power supply device (not shown) in order to prolong the life of the light source 10 and obtain a predetermined color temperature. Light source 10
On the light-irradiating side of the, two (1/4) circular fan-shaped filter plates formed by a logarithmic curve are combined and arranged in a pair on the left and right respectively, Y (yellow), M (magenta). A dimming filter 14 composed of three complementary color filters of C and C and a mirror box 16 equipped with a scattering plate are arranged in order, and the light beam emitted from the light source 10 has a color balance and a quantity of light in the dimming filter 14. After the adjustment, the mirror box 16 converts the diffused light into a uniform diffused light, and the color negative film 18 held by the negative carrier is irradiated with the diffused light. To adjust the light source voltage, set each complementary color filter of the dimming filter to the mechanical center, measure the light intensity with an illuminometer, and adjust it so that the light intensity is constant (standard exposure time). Adjust so that 90% voltage is supplied. An optical system 20 and a black shutter 22 are arranged in this order on the transmitted light exit side of the color negative film 18, and the black shutter 22 is opened to form an image on the photographic paper 24 with the light passing through the color negative film 18 to expose the photographic paper. Is configured. The exposed photographic printing paper 24 is processed into a print 27 after being processed in a developing process 25.

A drive circuit 26 is connected to the dimming filter 14, and the drive circuit 26 moves each of the complementary color filters in a direction perpendicular to the optical axis so that the color balance and the amount of light can be adjusted. A drive circuit 29 is connected to the black shutter 22.

R near the optical system 20 side of the color negative film 18
Outputting R, G, B signals with three filters that respectively transmit (red) light, G (green) light and B (blue) light 3
A camera 30 constituted by a plate camera and an image information detection device 32 having a two-dimensional image sensor for detecting image density information of the three primary colors R, G, B are arranged. This two-dimensional image sensor is composed of a CCD (charge coupled device). The camera 30 may be a CCD single plate camera.

Here, in a normal TV system, the γ of the TV is set to about 2.2, so a γ correction circuit of γ = 0.45 is provided in the TV camera so that γ = 1 as a whole. Since γ of paper is about γ = 2.0, in the present embodiment, the γ correction circuit is not provided in the camera 30 and γ in the simulator is set to about 1.

The camera 30 has a simulator 34 through a gain control circuit 33.
The image information detecting device 32 is also connected to the slope control circuit 62 via the δ / γ correction circuit 38 and the print system density calculation circuit 40. The print system density calculation circuit 40 and the slope control circuit 62 correct the color balance and density described above. In addition, the chromaticity meter 42 is arranged so as to face the screen of the CRT 345 that constitutes the simulator 34, and prints
A chromaticity meter 44 is arranged so as to face the screen of 27.
The chromaticity meters 42 and 44 are connected to the I / O port 46 which constitutes a computer. Computer is I / O port 4 above
6, CPU 48, read-on memory (ROM) 50, random access memory (RAM) 52, digital-analog (D / A) converter 54, analog-digital (A / D) converter 56, 58 and connecting them It is configured to include a bus 60 such as a data bus and a control bus, and has a gain control circuit 33, a simulator 34, a δ / γ correction circuit 38, and a print system density calculation circuit.
The slope control circuit 62 connected to 40 and the drive circuit 26 are connected to the drive circuit 29.

As shown in FIG. 3, the .delta. And .gamma. Correction circuit 38 converts the R signal output from the image information detecting device 32 into a density signal and corrects .delta. And .gamma. And a signal processing circuit 64 for converting the B signal into a density signal and performing δ, γ correction. Since these signal processing circuits 60, 62, 64 have the same configuration, only the signal processing circuit 60 will be described. The signal processing circuit 60 is composed of an offset correction circuit 601, a logarithmic conversion circuit 602 for converting into a density signal, a δ correction circuit 603 and a γ correction circuit 604. Offset correction circuit 6
01 is composed of an operational amplifier OP3, resistors R6 and R7, and a variable power source B1. The δ correction circuit 603 includes an operational amplifier OP4, resistors R6 and R7, and a variable power source B2. And
The R, G and B signals are corrected by δ and γ and output.

The gain control circuit 33, as shown in FIG.
1, operational amplifier 332, flip-flop 333 and resistor 334
˜336, one input terminal of the operational amplifier 332 is connected to the reference voltage (corresponding to the white level) via the resistor 336.
0.7V) is input.

In order to adjust the gain of the camera 30 by the gain control circuit 33, a plurality of reference negatives (so-called blank negatives) having different negative sizes developed from the unphotographed film are set in the negative carrier and the gain is adjusted for each negative size to adjust the brightness. To be the reference value. The reason why the gain is adjusted in this way is that the mirror box is converted by the change in the negative size and the magnification of the optical system is also changed, so that the amount of light received by the camera 30 changes. Next, the blank negatives are picked up by the camera 30 for each negative size, and analog signals are output from the D / A converter 54 to the camera outputs of the three primary colors of R, G, B, and the gain of the amplifier 331 is changed for each negative size. Control. Since the output of the amplifier 331 is input to the operational amplifier 332,
The operational amplifier 332 compares the reference voltage with the output of the amplifier 331 and outputs a signal via the flip-flop 333 when the output of the amplifier 331 matches the reference voltage. Then, when the signal is output from the flip-flop 333, the adjustment of the gain is stopped so that the camera output is adjusted to the white level. As a result, the color balance can be adjusted by matching the white level of the camera in the case of a clear negative (when the amount of light transmitted through the negative is maximum), so that the brightness standard can be determined easily and accurately. . When the gain is adjusted as described above, the gain is adjusted so that the level of any one of the R, G, and B primary color signals (for example, the G signal of the intermediate wavelength) becomes the white level. After that, if the gain is adjusted so that the levels of the remaining signals (for example, the R and B signals) become the white level, the adjustment can be easily performed.

Further, in order to adjust the color balance by adjusting the camera output using the normal eyeball negatives having different negative sizes, the gain is controlled for each negative size as described above so that the reference light amount is obtained. As described above, the gain is controlled for each negative size so that the camera outputs of the three primary colors G, B, and B have predetermined values. Here, assuming that the normal eyeball negative made with the 35 mm width film has an ideal spectral characteristic, the R, G, and B densities excluding the base portion of the negative are R = 0.26, G = 0.31, and B = 0.59, respectively. Therefore, if the negative base density is set to 90% of the white level (0.7V) of the camera for the three primary colors, the camera output of each of R, G, and B will be
The gain is controlled so that R = 0.35V, G = 0.31V, and B = 0.16V. This allows each output of the camera to correspond to a negative density. Also, when using a normal eyeball negative, if one of the three primary color signals is adjusted to a predetermined level in the same manner as described above, the gain is controlled so that the remaining signals have a predetermined level. The gain can be easily controlled.

In addition, the gain after the color balance and the brightness are adjusted as described above is converted into a channel by a digital value for each negative size and stored, and the gain is automatically switched by switching the channel each time the negative size is changed. . By doing so, even if the negative size of the color negative film to be printed on the printing paper is changed, the gain of the camera can be switched and the brightness and color balance can be switched only by switching the channel. In the above case, if the light source is deviated from the standard state, it is necessary to electrically correct the deviated amount. Therefore, it is preferable to adjust in the light source state in which the standard gray negative finishes the standard gray print.

The above-mentioned simulator 34 is a logarithmic converter 341 connected to the output terminal of the gain control circuit 33, and corrects the difference between the density (integrated density) seen by the spectral sensitivity of the camera and the density seen by the spectral sensitivity of the print. 3-matrix (third-order square matrix) circuit 34
2. N / P inversion circuit 343 that inverts negative / positive (N / P) and converts it to the analysis density of photographic paper. Luminance signal conversion that converts the analysis density of photographic paper into the emission brightness of each color of the CRT phosphor. A circuit 344 and a CRT 345 that displays an image captured by the camera 30 by coloring the fluorescent body according to the outputs of the circuit 344 and the luminance signal conversion circuit 344 are sequentially connected in series.

Correction of received light spectral characteristics Here, a value obtained by logarithmically converting each of the B, G, and R signals output from the camera 30 by the logarithmic conversion circuit 341, that is, the integrated density of the color negative film image as seen by the spectral sensitivity of the camera is B ′.
_When 3 × 3 matrix A ⁻¹ (where −1 indicates an inverse matrix) is used as _TV , G ′ _TV , and R ′ _TV , conversion to the negative analysis density is given by the following equation.

Further, the following expression when Karane viewed in spectral sensitivity of the photographic paper to convert the integral density of the film image B _{'P, G' P,} the analytical densities of the negative by using a 3 × 3 the matrix B ^-1 as _{R 'P} become.

Negative analytical concentration (B _TV , G in equations (1) and (2) above
_{Since TV} , R _TV ) and (B _P , G _P , R _P ) are proportional, they are expressed by the following equation (3) using a diagonal matrix α whose diagonal component is a proportional constant.

Therefore, using the above equations (1) to (3), (B _P , G _P , R ′
_P ) and (B ′ _TV , G ′ _TV , R ′ _TV ) are obtained, the following equation (4) is obtained. With this, the density measured by the spectral sensitivity of TV is the density measured by the spectral sensitivity of photographic paper. Is converted to.

However, Is.

The respective components of the above matrixes B, α, and A are obtained in advance in consideration of the color-developing characteristics of the color negative film, the spectral sensitivity characteristics of the printing paper, and the sensitivity characteristics of the camera for samples such as reference negatives, and the matrix shown below is 3 ×. 3 is set in the matrix circuit 342.

The negative / positive inversion N / P inversion circuit 343 is a circuit for converting γ into −γ and converts and outputs the output of the 3 × 3 matrix circuit 342 according to the following straight line.

y−y ₁ = a (x−x ₁ ) ... (6) where x ₁ and y ₁ are the coordinate values of the point where N / P inversion is not performed (hereinafter referred to as the “Pipot point”), and x and y are the density regions in xy coordinates. The coordinate value when expressed, a is a constant, and usually a negative value is selected.

As the above-mentioned point, a point at which the concentration should not change even if N / P inversion is selected is selected. On the camera and CRT, the black level to the white level are displayed at 0 to 0.7V, but when the black level is logarithmically converted, it becomes −∞, and the black level cannot be accurately inverted to the white level. Therefore, when reversing N / P, N / P is set to around 23% of the white level of the camera output V _in (0.63 in density excluding the negative base), and N / P is set as the point.
P inversion is preferred.

The fourth figure, the relationship between the camera output V _in the N / P inverting circuit 343 outputs V _out when the N / P reverse the 23% white level of the camera output V _in the Pipotsuto point is shown. Since the white level of the camera is 0.7V, 23% of the white level is 0.161V. Here, when the output of the 3 × 3 matrix circuit 342 is expressed as y = 3.2518 + logV _in (7), the coordinates corresponding to 23% of the white level are (0.161,
2.47). Then, when the curve represented by the above equation (7) is converted according to the straight line y−2.47 = a (x−2.47) (8) passing through (2.47, 2.47),
The curve shown in FIG. 4 was obtained, and it means that N / P inversion was performed. As can be seen from FIG. 4, the value of 23% of the white level of the camera output does not change even after the N / P inversion.

In addition, in order to perform N / P inversion, the N / P inversion circuit is configured by the circuit shown in FIG. 5, and the pivot point is obtained as described below.
You may make it reverse N / P. The circuit shown in FIG. 5 includes operational amplifiers OP1 and OP2, a variable resistance R1 and a variable resistance that set reference voltages V _x and V _y (corresponding to the pivot point) of the operational amplifiers.
It is provided with an operating mechanism AC that changes the reference voltage by moving the contact of R1. A signal is input to the inverting input terminal of the operational amplifier OP1 via the resistor R2, and a variable resistor R3 for adjusting the gain is connected between the inverting input terminal and the output terminal of the operational amplifier OP1. Operational amplifier
The output terminal of OP1 is connected to the inverting input terminal of the operational amplifier OP2 via the resistor R4. A resistor R5 is connected between the inverting input terminal and the output terminal of the operational amplifier OP2. Variable resistor R1
Of the variable resistor R1 is connected to the non-inverting input terminals of the operational amplifiers OP1 and OP2, respectively.

A method for obtaining the spot points using the above circuit will be described. First, a color negative film that has developed a standard gray color is sandwiched between negative carriers and is imaged by a camera, and after N / P inversion by the circuit of FIG. 5, it is displayed on the CRT screen. Next, a standard gray signal is electrically created (it can be created by setting the white level of the CRT to 23%) and displayed on the CRT screen in close proximity to the negative image. Then, by operating the keyboard, the resistance value of the variable resistor R1 is continuously changed to change the reference voltages V _x and V _y, and an image with a standard gray signal that electrically creates a negative image with a standard gray color is produced. To match. As a result, the spot point is determined.

By using the above circuit, the gray level can be set according to the sense of the measurer, and the gray level can be set according to the sense of the measurer so that it matches the finished state of the print. It is possible to set a gray level, which enables accurate simulation including the conditions such as developing conditions (fatigue of developing solution, temperature change of developing solution, etc.).

Correction of color spectral characteristics Since the CRT displays an image with a light emitter, the brightness of the CRT is proportional to the voltage. However, since photographic paper uses an absorber (dye), the amount of dye is not proportional to the brightness, but the amount of dye is proportional to the logarithm of brightness, and if the amount of dye is further changed, the chromaticity point will change. Change. That is, the dye on photographic paper is
Unstable primary color (C,
Y, M).

Therefore, the brightness signal conversion circuit 344 converts the output D of the N / P inversion circuit 343 into the analysis brightness signal T according to the following equation and outputs it to the CRT 345.

T = F (log ⁻¹ (f (D))) (9) where f is a function for converting the output D into an integrated concentration, and F is a conversion of the integrated transmittance log ⁻¹ (D) into an analytical luminance signal. Is a function that does.

The functions F and f are determined by determining the output D and the analysis luminance signal T to optimal values in advance and performing optimization by the least square method or regression. As the functions F and f, a 3 × 3 matrix is generally used.

Then, the CRT is controlled by the luminance signal obtained by the luminance signal conversion circuit 344 as described above, and an image having a coloring characteristic that matches the coloring characteristic of the printing paper is displayed on the CRT.

In the above description, an example in which the gain of an electric signal is stored and switched for each negative size using a camera that does not have a diaphragm mechanism has been described. However, as described in the above aspect, a camera that has a diaphragm mechanism is used. The brightness and color balance may be adjusted for each negative size by adjusting the aperture mechanism or the gain of the electrical signal, and the position of the aperture mechanism or the gain of the electrical signal at this time may be stored in association with the negative size.

[Brief description of drawings]

1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a circuit diagram showing an example of a gain control circuit shown in FIG. 1, and FIG.
FIG. 4 is a circuit diagram showing an example of the δ and γ correction circuit in FIG.
FIG. 5 is a diagram for explaining the inversion, and FIG. 5 is another circuit diagram for performing the N / P inversion. 14 …… Light control filter, 27 …… Print, 34 …… Simulator.

Claims (6)

[Claims] 1. A light source system for illuminating a light beam on a color negative film, an optical system for forming a negative image recorded on the color negative film on a photographic paper arranged on the light beam transmitting side of the color negative film, and each finished print. In an automatic photoprinting apparatus having an automatic exposure control function for dimming the light source system so that the color tone and the density of the light source system are the same, and the light source is dimmed by the automatic exposure control function of the automatic photoprinting apparatus. The negative image recorded on the color negative film illuminated by the system is imaged using an imaging device that decomposes the received light beam into three primary colors and outputs as an electrical signal corresponding to the three primary colors, and converts the imaging device output. When adjusting the image pickup device of the simulator that displays a positive image as a positive image, each time the negative size is changed, a corresponding reference negative is used to set the image pickup device. The reference negative is imaged by adjusting the gain of the electric signal so that the output corresponds to the density of the reference negative, and the adjusted gain of the electric signal is stored for each negative size, and the negative size of the color negative film is changed. Each time the gain is adjusted, the gain is adjusted based on the stored contents. 2. An unexposed negative film produced by developing an unexposed film is used as the color negative film, the unexposed negative film is imaged by using the photographing device, the gain of the electric signal is adjusted, and the brightness is adjusted. A method for adjusting an image pickup device for a simulator according to claim 1, wherein the output of the image pickup device is adjusted to a value corresponding to a white level. 3. An eyeball negative having the portion corresponding to the negative that has photographed a gray object and a portion that corresponds to the negative that has photographed a yellow-green object as the reference negative, and the eyeball negative is obtained by using the image pickup device. An image is taken, the gain of the electric signal is adjusted, the brightness is adjusted, and all the outputs of the imaging device are adjusted to a predetermined level that is the same as the print finish of the eyeball negative. A method of adjusting an image pickup device for a simulator according to the item (1). 4. A light source system for illuminating a light beam on a color negative film, an optical system for forming a negative image recorded on the color negative film on a photographic paper arranged on the light beam transmitting side of the color negative film, and each finished print. In an automatic photoprinting apparatus having an automatic exposure control function for dimming the light source system so that the color tone and the density of the light source system are the same, and the light source is dimmed by the automatic exposure control function of the automatic photoprinting apparatus. The negative image recorded on the color negative film illuminated by the system is imaged by using an imaging device that has a diaphragm mechanism and decomposes the received light beam into three primary colors and outputs it as an electrical signal corresponding to the three primary colors. When adjusting the imaging device of the simulator that converts the device output and displays it as a positive image, for each negative size,
Using the corresponding reference negative, the gain of the aperture mechanism or the electric signal is adjusted so that the image pickup device output corresponds to the density of the reference negative, the reference negative is imaged, and the adjusted position of the aperture mechanism or A method for adjusting an image pickup device for a simulator, wherein the gain of an electric signal is stored for each negative size, and the diaphragm mechanism or the gain is adjusted based on the stored content each time the negative size of the color negative film is changed. 5. An unexposed negative film produced by developing an unexposed film is used as the color negative film, and the unexposed film negative image is taken by using the image pickup device, and the diaphragm mechanism or the gain of the electric signal is adjusted. The adjusting method for an image pickup device for a simulator according to claim (4), wherein the brightness is adjusted and all the outputs of the image pickup device are adjusted to values corresponding to the white level. 6. An eyeball negative using the image pickup device, wherein an eyeball negative having a portion corresponding to a negative photographed of a yellow-green subject around the portion corresponding to a negative photographed of a gray subject is used as the reference negative. Image, and adjusting the aperture mechanism or the gain of the electric signal to adjust the brightness and adjust all outputs of the imaging device to a predetermined level that is the same as the print finish of the eyeball negative. A method of adjusting an image pickup device for a simulator according to claim (4).