JPH07104565B2 - Automatic photo printing machine simulator - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simulator of an automatic photographic printing apparatus, and more particularly to a color negative film having the same image as a finished print printed and processed on photographic paper by the color automatic photographic printing apparatus. The present invention relates to a simulator of an automatic photo printing apparatus obtained from CRT and displayed on a CRT.

[Conventional technology]

Conventionally, the integrated transmission density (LATD) of the entire image of a color negative film is measured to correct the density and perform slope control, so that the density and color balance of all finished prints are negative shades (exposure under, proper exposure,
There is known an automatic color photographic printing apparatus which prints and develops the same image regardless of overexposure. This automatic photographic printing apparatus is configured by sequentially arranging an optical system including a light source, a light control filter, a mirror box, a negative carrier, and a black shutter. 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 photographic paper is configured so that the print is automatically finished by being developed by a developing process. 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 finished prints have the same density and color balance unless the developing process is changed.

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, even if density correction or slope control is performed, the finished state of the print may deteriorate. 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 obtained 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 the 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. Further, as shown in Japanese 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
It has been attempted to reduce the frequency of reprinting development processing.

[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 simulator of the automatic photoprinting device are separate bodies, it is possible to use the information obtained by the inspection device to perform the printing development with the automatic photoprinting device. There is a problem that the same image as the image displayed on the TV screen cannot be printed due to changes in the light source. In addition, in the case where the automatic exposure machine and the brightness and contrast adjustment resistance of the TV are linked, an appropriate image is simply displayed on the TV screen despite the difference in the color development characteristics of the TV and the photographic paper. So that
There is a problem that it only controls the TV signal, and the same image as printed is not displayed on the TV screen.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a simulator of an automatic photographic printing apparatus capable of accurately and automatically displaying the same image as a finished print.

[Means for solving problems]

In order to achieve the above object, the present invention provides an image pickup device for picking up a negative image recorded on a color negative film illuminated by a light source system controlled by an automatic exposure control function of an automatic photoprinting device, and the negative image. A simulator of an automatic photoprinting apparatus including an inversion circuit that inverts a signal obtained by the image pickup device so as to obtain a corresponding positive image, and a CRT that displays a positive image based on the signal obtained by the inversion circuit. And connecting a first conversion circuit to an input side of the inverting circuit and a second conversion circuit to an output side of the inverting circuit.
And the integrated density of the negative image as seen by the spectral sensitivity of the image pickup device and the integrated density of the negative image as seen by the spectral sensitivity of the printing paper by the first and second conversion circuits. The difference is corrected, and the tristimulus value due to the emission spectral characteristic of the phosphor of the CRT is made equal to the tristimulus value due to the absorption characteristic of the dye of the print.

In the above case, the transmission density signal obtained by the image pickup device is converted by the first conversion circuit, and the integrated density of the negative image seen by the spectral sensitivity of the image pickup device and the negative image seen by the spectral sensitivity of the printing paper. The difference from the integrated concentration of
It is preferable that the transmission density signal inverted by the inversion circuit is converted by the conversion circuit so that the tristimulus value by the emission spectral characteristic of the phosphor of the CRT becomes equal to the tristimulus value by the absorption characteristic of the dye of the printing paper. .

[Action]

According to the present invention, a negative image recorded on a color negative film illuminated by a light source system controlled by the automatic exposure control function of the automatic photoprinting apparatus is imaged by the image pickup apparatus. A transmission density signal is obtained by logarithmically converting the signal of the negative image. Since the first converting circuit is connected to the input side of the inverting circuit and the second converting circuit is connected to the output side, the inverting circuit inverts the transmission density signal converted by the first converting circuit. A positive image should be obtained for the negative image. Then, since the integrated density of the negative image as seen by the spectral sensitivity of the image pickup device and the integrated density of the negative image as seen by the spectral sensitivity of the printing paper are equal, the spectral sensitivity of the image pickup device is determined by the first conversion circuit and the second conversion circuit. The difference between the integrated density of the negative image and the integrated density of the negative image based on the spectral sensitivity of the photographic paper is corrected, and the tristimulus value due to the emission spectral characteristics of the CRT phosphor depends on the absorption characteristics of the dye on the photographic paper. Converted to be equal to the tristimulus value. As a result, the color of the imaging device and the color of the printing paper are made equal, and the color of the CRT screen and the color of the printing paper are made equal. The first conversion circuit converts the transmission density signal to correct the difference between the integrated density of the negative image as seen by the spectral sensitivity of the image pickup device and the integrated density of the negative image as seen by the spectral sensitivity of the printing paper. The conversion circuit can make the tristimulus value due to the emission spectral characteristic of the CRT phosphor equal to the tristimulus value due to the absorption characteristic of the dye of the printing paper. As the first conversion circuit and the second conversion circuit, it is possible to use a 3 × 3 matrix circuit in which a third-order square matrix component is set and which multiplies an input signal. Since the density and color balance are adjusted by the above automatic photo printing device, the image in which the color matches the color of the finished print will be displayed on the CRT without adjusting the color balance and density by the simulator. The same image as the finished print can be displayed on the CRT.

〔The invention's effect〕

As described above, according to the present invention, the negative image of the color negative film illuminated by the light beam after being controlled by the automatic exposure function of the automatic photographic printing apparatus is picked up and displayed on the CRT and the color development characteristics of the photographic paper are also displayed. CRT by the signal matched with
Since a positive image is displayed on the CRT, the same image as the finished print can be displayed on the CRT, which allows you to visually see the same image as the finished print that was developed before the development process. Therefore, it is possible to find the inadequacy of printing and developing. Also, because the image of the finished print and the image of the CRT are made to match on the input side and the output side of the reversing circuit, accurate simulation is performed. The effect that can be obtained is obtained.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.
This embodiment is a combination of a simulator (hereinafter referred to as a printer) of an automatic color photoprinting device and a device (hereinafter referred to as a simulator) for displaying an image photographed on a color negative film in the same state as when it is printed by the printer. is there.

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 color negative film 18 which is converted into uniform diffused light by the mirror box 16 and held in the negative carrier is irradiated with the diffused light. To adjust the light source voltage above,
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 constant light intensity (standard exposure time) is reached so that a voltage of approximately 90% of the rated voltage is supplied. Adjust. 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 composed of a plate camera and an image information detecting device 32 having a two-dimensional image sensor for detecting image density information of three primary colors of R, G and 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, since the γ of TV is about 2.2, the γ correction circuit of γ = 0.45 is provided in the TV camera so that γ = 1 as a whole. Since γ 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 347 that constitutes the simulator 34, and the print
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.

The gain control circuit 33, as shown in FIG.
1, operational amplifier 332, flip-flop 333 and resistor 334
To 336, a reference voltage (0.7 V corresponding to a white level) is input to one input terminal of the operational amplifier 332 via the resistor 336. In order to adjust the gain of the camera 30 by the gain control circuit 33, a reference negative (a so-called blank negative) on which an unphotographed film has been developed is imaged by the camera 30 to adjust the iris, and the three primary colors of R, G and B are adjusted. This is done by outputting an analog signal from the D / A converter 54 to the camera output and stopping the gain adjustment when the signal is output from the flip-flop 333. Accordingly, the white level of the camera can be adjusted in the case of a clear negative (when the transmitted light of the negative is maximum), so that the brightness standard can be determined easily and accurately. When adjusting the iris and the gain as described above, R, G, B
After adjusting the iris so that the level of any one of the three primary color signals (for example, the G signal of the intermediate wavelength) becomes the white level, the levels of the remaining signals (for example, the R and B signals) become the white level. The iris and the gain can be easily adjusted by adjusting the gain so that

Also, the iris position and the color balance position of the camera after the gain is adjusted as described above are stored as digital values, and the negative size (the light amount changes because the magnification is different)
If each channel is converted into a channel, the sensitivity of brightness can be automatically switched by switching the channel each time the negative size is changed. By doing so, even if the negative size is changed, the iris position and the color balance position of the camera can be automatically changed in accordance with the negative size only by changing 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, so it is preferable to adjust the negative of the standard gray in the state of the light source that finishes the standard gray print.

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 includes an offset correction circuit 601, a logarithmic conversion circuit 602 for converting the 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 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) as seen by the spectral sensitivity of the camera and the density as seen by the spectral sensitivity of the printing paper. 3 × 3 matrix (third-order square matrix) circuit 342 as the conversion circuit of 1, N / P inversion circuit 343 that inverts the negative / positive (N / P) and converts it into the analysis density of the printing paper, the analysis density of the printing paper To the concentration of the main absorption of dye on photographic paper 3 ×
3 matrix circuit 344, antilogarithmic conversion circuit 345, 3 × 3 matrix circuit 346 for converting to the emission brightness of the fluorescent body of CRT
And a CRT 347 that displays an image captured by the camera 30 by causing the fluorescent substance to color in accordance with the output of the 3 × 3 matrix circuit 346.
Are sequentially connected in series. The luminance signal conversion circuit 344, the antilogarithmic conversion circuit 345 and the 3 × 3 matrix circuit 346 act as a second conversion circuit.

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.

Also, the integration density of the color negative film image viewed by the spectral sensitivity of the printing paper B _'p, G' _P, is converted into analytical density of the negative using the 3 × 3 the matrix B ^-1 as R _'P as: 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 equal, we use the diagonal matrix α with the diagonal component as the proportionality constant, and the following (3)
It is represented by a formula.

Therefore, using the above equations (1) to (3), (B ′ _P ,
G _'P, R' _P) and _{(B 'TV, G' TV} , R 'TV) When determining the relationship between the following equation (4) is obtained, whereby seen in the spectral sensitivity of the TV density and printing paper It is possible to correct the difference from the density as seen by the spectral sensitivity of.

The 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 spectral sensitivity characteristics of the camera for samples such as reference negatives. It is set in the × 3 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 , y ₁ ) is a point where N / P inversion is not performed (hereinafter referred to as a spot point), and x and y represent the concentration area in xy coordinates. The coordinate value, a, is a constant and normally a negative value is selected.

Since a camera and a CRT display a black level to a white level at 0 to 0.7 V, the black level 0 becomes −∞ when the logarithm of the video signal is taken, and for example, the black level cannot be accurately inverted to the white level. Sometimes. Therefore, upon N / P inversion, it is preferable to perform N / P inversion with a point near 23% of the white level of the camera output V _in (0.63 at the density excluding the negative base portion) as a pivot point.

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 expressed by the above formula (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 imaged by a camera, and after N / P inversion by the circuit in 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 of a standard gray signal that is an electrical image of a negative image colored in standard gray is created. 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. A gray level can be set, which enables accurate simulation including the conditions such as developing conditions (fatigue of developing solution, temperature change of developing solution).

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 the print uses an absorber (dye), the amount of dye and brightness are not proportional, but the amount of dye and the logarithm of brightness are proportional, and if the amount of dye is further changed, the chromaticity point changes. To do. Therefore, in this embodiment, 3 ×
3 matrix circuit 344, inverse logarithmic conversion circuit 345 and 3 ×
By using the 3 matrix circuit 346, the color development characteristics of the print dye and the color development characteristics of the CRT illuminant are matched. Since the print dye is an unstable primary color (C, Y, M) whose chromaticity point changes according to the change of the dye amount as described above, the primary color will be considered in the similar manner to the sub-absorption block dye. .

The wavelength of the light reflected from the print is divided into three, 380 to λ ₁
When nm is the G region, λ _{1 to} λ ₂ nm is the B region, and λ _{2 to} 780 nm is the R region, the spectral transmittances T _R , T _G , and T _B in consideration of sub-absorption in the R, G, and B regions are respectively It is expressed by the following formula.

T _R = T _{C R} × TM _R × TY _R … (9) T _G = TC _G × TM _G × TY _G … (10) T _B = TC _B × TM _B × TY _B … (11) However, (9) ~ T in each term on the right side of the equation (11) indicates the transmittance, C, M, and Y indicate the complementary colors of R, G, and B, respectively, and the suffixes _R , _G , and _B indicate the respective wavelength-divided regions. Show.

When the above-mentioned (9), (10), and (11) are displayed in the respective concentrations, the following formula is obtained.

_{D R = DC R + DM R} + DY R ... (12) D G = DC G + DM G + DY G ... (13) D B = DC B + DM B + DY B ... (14) (12) - (14) of the sub Main absorption (DC _R , DM _G , DY
_When expressed as a function of _B , the following equations (15) to (17) are obtained.

D _R = DC _R + DM _R (DM _G ) + DY _R (DY _B ) ... (15) D _G = DC _G (DC _R ) + DM _G + DY _G (DY _B ) ... (16) D _B = DC _B (DC _R ) + DM _B (DM _G ) + DY _B (17) Assuming that the above equations (15) to (17) follow Beer's law, display them in 3 × 3 matrix as shown in the following equation (18). You can

Here, since the output inverted by the N / P inversion circuit 343 shows the analysis density corresponding to the dye amount of the print, the matrix shown in the following equation (19) is set in the 3 × 3 matrix circuit 344. By setting, it is possible to convert to an approximate integrated concentration of only main absorption.

On the other hand, the tristimulus values X, Y, and Z can be expressed by the following equation (20) (only the stimulus value X is shown below).

Here, Eλ is the spectral radiant flux of the illumination light of the object, τλ is the spectral reflectance of the object, λ red light stimulus value, and λ is the green light stimulus value.

When the tristimulus values represented as above are matrix-displayed, the following equation (21) is obtained.

However, T _R , T _G , and T _B are integrated transmittances, and X, Y, and Z with a suffix are stimulus values of colors corresponding to the suffix.

Here, when the relationship between the luminance signal (T _R ′, T _G ′, T _B ′) of the CRT and the tristimulus values (X ′, Y ′, Z ′) is represented by a matrix as in the above equation, Becomes Therefore, Then, the following relation is obtained.

When the luminance signal of the CRT, that is, the target value is obtained from the above equation (23), the following relationship is obtained.

Therefore, by setting the matrix shown in the following equation in the above 3 × 3 matrix circuit 346, the emission brightness of the phosphor of each color of the CRT can be obtained, and the CRT can be obtained by the signal of this emission brightness.
The illuminator emits light.

Here, in equation (24) Is equal to the tristimulus value of photographic paper according to equation (21), so the chromaticity meter
Is obtained by measuring the chromaticity point of the finished print 27.

The component of the inverse matrix of the equation (24) is obtained by measuring the tristimulus value of the CRT with the chromaticity meter 42. That is, in the above equation (24), T _G ′ = T _B ′ = 0 and T _R ′ is set to a predetermined voltage to obtain X _R ′, Y _R ′ and Z _R ′.
Set T _R ′ = T _B ′ = 0 and set T _G ′ to a predetermined voltage.
Find X _G ′, Y _G ′, Z _G ′, and set T _R ′ = T _G ′ = 0
It can be determined by setting T _B ′ to a predetermined voltage and obtaining X _B ′, Y _B ′ and Z _B ′. As a result, the electric signal to be given to the CRT, that is, the target value can be determined from the equation (24).

Further, the matrix D of the equations (19) and (25),
The components of T are represented by representative values f ₃ and f ₄ , respectively, and when the input of the 3 × 3 matrix circuit 344 is the output of the 3 × 3 matrix circuit 346, there is a relation of the following equation (26).

= F ₄ [log ⁻¹ (f ₃ ())] (26) Here, is the output of the N / P inversion circuit, and is calculated as described above by multiplying the print density by −γ. Further, T is (T _R ′, T _G ′, T _B ′) obtained above. Therefore, since the input and output of the equation (26) are determined, the respective components of the 3 × 3 matrix circuits 344 and 347 can be obtained by performing optimization by the least square method or regression.

As described above, according to the present embodiment, the negative-positive reversal is performed after the light receiving spectral characteristic is corrected, and then the color developing spectral characteristic is corrected.

[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 (3)

[Claims] 1. An image pickup device for picking up a negative image recorded on a color negative film illuminated by a light source system controlled by an automatic exposure control function of an automatic photoprinting device, and a positive image corresponding to the negative image are obtained. And an inversion circuit that inverts the signal obtained by the image pickup device and a CRT that displays a positive image based on the signal obtained by the inversion circuit.
And a first conversion circuit connected to the input side of the inverting circuit and a second conversion circuit connected to the output side of the inverting circuit. And the second conversion circuit correct the difference between the integrated density of the negative image as seen by the spectral sensitivity of the image pickup device and the integrated density of the negative image as seen by the spectral sensitivity of the photographic paper, and at the same time, the CRT A simulator for an automatic photographic printing apparatus, characterized in that the tristimulus values due to the emission spectral characteristics of the photoconductor are made equal to the tristimulus values due to the absorption characteristics of the dye in the print. 2. The first conversion circuit converts a transmission density signal obtained by the image pickup device and integrates a negative image as seen by the spectral sensitivity of the photographing device and a negative image as seen by the spectral sensitivity of photographic paper. Correcting the difference from the density, the second conversion circuit uses the inversion circuit so that the tristimulus value due to the emission spectral characteristic of the phosphor of the CRT becomes equal to the tristimulus value due to the absorption characteristic of the dye of the print. A simulator for an automatic photographic printing apparatus according to claim 1, which converts an inverted transmission density signal. 3. The claim (1) or (2), wherein the first conversion circuit and the second conversion circuit are constituted by a 3 × 3 matrix circuit having a third-order square matrix component as a parameter. ) The simulator of the automatic photographic printing apparatus described in the section.