JPH0740121B2 - Color photo printing device - Google Patents

Description

The present invention relates to a color photographic printing apparatus, and in particular, a color film having different characteristics is printed under one printing exposure condition (printing condition).
The present invention relates to a color photoprinting device of an additive type capable of being printed by.

[Conventional technology and problems]

In a color photographic printing apparatus, it is important that the spectral sensitivity distribution of the photometric system and the spectral sensitivity distribution of the exposure system be exactly matched. Conventionally, because the spectral sensitivity distributions of the two do not match, it is necessary to determine and store the printing conditions for only the type of negative film, and manage these printing conditions so that they are always appropriate. This effort is very large, and in many cases printing conditions are not properly set, and a large number of poor quality prints are often produced. In order to match the spectral sensitivity distributions of the photometric system and the exposure system, the total photosensitivity of the light receiving device for the effective light transmission of the original document has been conventionally combined with a light transmission measuring circuit of the original document and a filter matching the photosensitive wavelength of the photosensitive paper. , Which is the same as or approximately equal to the spectral sensitivity of the photosensitive paper used by, is a copier (Japanese Patent Publication No. 45-49115) and uses CdS for the photoelectric converter to approximate the spectral sensitivity of color paper by combining it with a filter. Color print color correction measuring device in which the difference between the printing density by the color paper and the measurement density of the photometric system is within 0.02 in optical density, blue and green of the color paper in the optical path between the light source and the light receiver, An auto color printer that transmits light with a wavelength of high sensitivity in each photosensitive area between the red photosensitive layers and inserts a filter that cuts light with a wavelength of low sensitivity between each photosensitive area is used. Proposal It is. In these conventional techniques, a filter is actively used to try to match the spectral sensitivity distributions of the photometric system and the exposure system. In the above copying machine and color print color correction measuring device, a filter that matches the spectral sensitivity distribution of the photosensitive paper is provided in the light receiver for measuring the transmission density of the entire screen. Further, in an auto color printer, a trimming filter that simultaneously changes the photosensitive paper and the photoreceiver filter is applied to match the spectral sensitivity distributions. This method only cuts the short wave or the long wave of the spectral sensitivity of color paper, and the matching of the spectral sensitivity distribution with the light receiver is still insufficient. Further, in these conventional techniques, only an attempt is made to match the spectral sensitivity distributions, and even if a sufficient match is obtained, there are abnormally many color areas, and it is practical without the color conversion of the color collection. It is difficult. Further, in Japanese Patent Laid-Open No. 59-220761, the first
The photometric system with the light source of the second light source and the exposure system with the second light source are made to have the same spectral sensitivity distribution, and the film is run by using the three line sensors to scan the film screen, and at least the neutral gray color of the screen is obtained. A method for determining a copying light amount is disclosed, which is adapted to copy an area at least in neutral gray.

However, since the spectral sensitivity of the photometric system is adjusted so as to match the spectral sensitivity distribution of the copying light-sensitive material in consideration of the optical factor of the amount of copying light, the spectral characteristics of the photometric filter become complicated and expensive. Further, it is necessary to manufacture the characteristics of the photometric filter with high accuracy and reproducibility. Furthermore, the optical system is large in order to match the resists of three colors, and the adjustment is troublesome. In addition, it is very inconvenient to scan any one or several frames in a film of one or one piece (a film obtained by cutting one film into predetermined frames) by scanning the film screen by running the film. There is also a drawback. Further, since the conventional method does not consider the difference in shape of the characteristic curve, which is different for each film type, it is difficult to print high quality from the negative of underexposure to the negative of overexposure.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and provides an additive type color photographic printing apparatus capable of printing various films with high quality under the same printing condition under one standard printing condition. With the goal.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a color glass and a dielectric multilayer film in which a transmission wavelength band is included in each of the red, green, and blue photosensitive layers of a color paper. A light source section for separating the white light into red, green, and blue light by the color separation filters of red, green, and blue, and irradiating the color filter, and a red light emitted from the light source section and transmitted through the color film. , A photometer having a spectral sensitivity distribution with a half-value width equal to or greater than the half-value width of the spectral transmittance distribution of the color separation filter for photometrically measuring green, green, and blue light, preset reference printing conditions, and the photometer And a control unit that controls the exposure amount based on the photometric value measured in step 1.

[Action]

The light source part of the present invention comprises a light source and a color separation filter provided with colored glass and a dielectric multilayer film, and the light transmitted through the color separation filter is the short-wave side of the red, green, and blue spectral sensitivity distribution of color paper. The red, green, and blue lights are effectively lower in both sensitivity on the long-wave side and the spectral sensitivity distribution of the color paper. The filter composed of colored glass has the characteristic that the spectral transmission characteristics shift to the long-wave side due to the temperature change during photometry and exposure, and the filter formed by coating the dielectric multilayer film has the same temperature change as above. Due to this, the spectral transmittance is shifted to the short wave side. Therefore, by providing the color separation filter with the colored glass and the dielectric multilayer film as in the embodiment of the present invention, the shift of the spectral characteristics to the long-wave side and the short-wave side due to the temperature change is offset, and the thermally stable spectral sensitivity distribution is obtained. The characteristics can be obtained, and the color separation filter can be used near the light source. By adopting a color-added printing method using this filter and a photometer having a wide spectral sensitivity distribution, the spectral sensitivity characteristics of the photometric system and the exposure system can be matched with high precision that has never been achieved.

The photometer simultaneously or sequentially measures red, green, and blue light emitted from the light source unit and transmitted through a color film such as a negative film. It is preferable that the photometric value measured by the photometer is removed from the subject dependency (for example, color area) of the negative film by the photometric value selecting means that selects it according to a preset standard. Then, the control means controls the exposure amount based on the preset standard print condition and the photometric value measured by the photometer. This reference print condition is set for a film type having specific characteristics, and is determined as a preferable exposure control method in the present invention from the film characteristics of this reference film type and the photometric value measured by the photometer. The exposure amount is controlled by comparing the film characteristics of the film type and correcting the reference printing conditions for each film type.

The color separation filter comprises a first member coated with a dielectric multilayer film forming a transmission wavelength band, and a second member closely attached to the coating surface of the first member. The sensitivity on the short-wave side and the long-wave side of the spectral sensitivity distribution of 1 may be effectively reduced. In this way, by adhering the second member to the coating surface of the first member, on which the dielectric multilayer film is coated, by adhesion or the like, it is possible to stabilize the dielectric multilayer film even in the vicinity of the light source section. It is possible to obtain the characteristics.

As the first member, a colored glass filter, a surface on which the second member is not adhered, that is, a surface on which the dielectric multilayer film forming the transmission wavelength band is not coated, is coated with a dielectric multilayer film that does not participate in the transmission wavelength band. Multi-layer coat filters can be used. Further, as the second member, a colored glass filter or a multi-layer coat filter coated with a dielectric multi-layer film which is not involved in the transmission wavelength band can be used. In order to bring the first member and the second member into close contact, a heat-resistant adhesive is used to adhere the entire surface of each member, only the peripheral portion is adhered, or a resin or heat-resistant rubber is used for sealing. Good.

Further, instead of the filter configured as described above, a filter using reflected light such as a dichroic mirror may be used. Although a filter will be described below, a mirror may be used and the present invention includes it.

Further, the first member or the second member can be configured by a long-wave transmission color glass filter having an absorption band on the short-wave side from the short-wave transmission wavelength end of the dielectric multilayer film forming the transmission wavelength band. In this way, by setting the transmission wavelength end of the colored glass filter on the short-wave side (for example, about 8 nm or more) of the transmission wavelength band formed by the dielectric other layer film, the transmission wavelength band can be changed to the transmission wavelength band even if heat changes. Colored glass filters can be used so that they are not involved. Colored glass filters have extremely high absorption characteristics, and if used in combination with a multilayer coating filter that allows sharp spectral characteristics and arbitrary wavelength selection, the wavelength band that the multilayer coating filter should reflect (absorb) is narrow. It is possible to make a filter easily, and it is possible to make a filter with low cost and high reliability.

〔The invention's effect〕

As described above, according to the present invention, a color separation filter composed of a colored glass and a dielectric multilayer film configured so that the change in the spectral characteristics is stable against temperature rise is used, and has sharp color separation characteristics. By using the color-added light source unit and the photometer having a broad spectral sensitivity distribution, the spectral sensitivity distributions of the photometric system and the exposure system can be easily matched to each other with a high degree of accuracy.
As a result, various films having different characteristics can be printed under one standard printing condition. Further, the exposure / photometry device can be applied to color photographic printing devices which are small in size, low in cost, and have various processing capabilities.

According to the present invention, the sensitivity of color paper is reduced to 70% or less, but the above-mentioned effects are sufficient to compensate for this drawback.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.
As shown in FIG. 1, a mirror box 18, a dichroic mirror 11 and a lamp house 10 provided with a halogen lamp are sequentially arranged below a negative film 20 loaded in a negative carrier and conveyed to a printing unit. . In addition, a lamp house 13 having the same configuration as the lamp house 10 is arranged near the lamp house 10. Dichroic mirror
A rotary disk 14 and an infrared cut filter 12 rotated by a motor 16 are sequentially inserted between the lamp housing 11 and the lamp house 10. Further, between the dichroic mirror 11 and the lamp house 13, there is an R as a red light decomposition filter.
A (red) filter 17 and an infrared cut filter 12 are inserted. The dichroic mirror 11 has characteristics defined so as to reflect R light and transmit G (green) light and B (blue) light.

As shown in FIG. 2, the rotary disk 14 is provided with a color separation filter composed of a G filter 15 and a B filter 19 near its circumference. Above G filter 15, B filter
As shown in FIG. 3 (1), the 17 and R filters 19 include white glass 23 and R, on which a dielectric multilayer film 25 is coated,
The G and B color glasses 21 are arranged in parallel with each other. Here, since the infrared cut filter 12 is always present on the lamp house 10 side and the R filter 17 is present on the lamp house 13 side, there is a risk of thermal instability immediately after each lamp house 10 is turned on. . Further, since the G filter 15 and the B filter 19 are sequentially arranged on the lamp house 10 by rotating the rotary disk 14, when these filters are inserted between the mirror box 18 and the lamp house 10, they are thermally heated. May become unstable. Fig. 4 (1)
Shows the characteristics with respect to the passage of time when the R filter is composed of only colored glass and is placed near the light source as shown in FIG. 1 and the lamp is turned on. The temperature reaches about 150 ° C within a few seconds and the relative transmittance fluctuates. Originally, a color glass filter is known to have a wavelength shift of 0.15 nm / ° C for an R filter, 0.10 nm / ° C for a G filter, and 0.08 nm / ° C for a B filter. Is not preferable.
It is known that the dielectric multilayer film shifts the spectral curve to the long wavelength side under heating, and conversely shifts to the short wavelength side under vacuum. Therefore, under the high temperature as in this embodiment, neither the colored glass filter alone nor the dielectric multilayer film alone can be used. However, in the present embodiment, a colored glass filter whose spectral transmission characteristic shifts to the long wave side due to temperature variation and a filter coated with a dielectric multilayer film whose spectral transmission characteristic shifts to the short wave side due to temperature variation are shown in FIG. By configuring as in 3), thermal fluctuation is prevented as shown in FIG. 4 (2). FIG. 4 (3) shows that a colored glass filter (R-64 filter manufactured by Hoya Glass Co., Ltd.) 21 and a dielectric multilayer film 25 form a short wavelength R, and the infrared cut filter 12 is thermally stable.
It shows that a long wavelength is formed.

The G filter 15, B filter 17 and R filter
19 may be formed by coating a dielectric multilayer film 25 on the surface of the colored glass 21 as shown in FIG. 3 (2). As shown in FIG. 3 (3), white plate glass may be formed by adhesion. The dielectric multilayer film 25 may be sealed between the 23 and the colored glass 21. For this adhesion, it is necessary to use a heat resistant adhesive.

As shown in FIG. 1, above the negative film 20,
A lens 22, a black shutter 24, and a color paper 26 are arranged in order, and are irradiated from the lamp house 10 through the infrared cut filter 12, the filter on the rotating disk 14, and the dichroic mirror 11, and also the lamp house 13.
Irradiated from the infrared cut filter 12 and R filter
The light rays incident on the mirror box 18 via the 17 and the dichroic mirror 11 are further transmitted through the negative film 20, and are imaged on the color paper 26 by the lens 22. Therefore, the R light and the B light or the R light and the G light are simultaneously applied to the film to perform photometry and exposure. This embodiment shows that at least two or more colors can be applied to an apparatus capable of simultaneous photometry and exposure.

A two-dimensional image sensor 28 as a photometer is arranged in a position inclined with respect to the optical axis of the image forming optical system and at a position where the image density of the negative film 20 can be measured. The two-dimensional image sensor 28 is a storage photoelectric conversion element such as CCD or MOS, an optical system for forming an image of the negative film 20 on the photoelectric conversion element, and a photoelectric conversion element output to process and output as image information. And a signal processing circuit for doing so. This signal processing circuit converts the output of the photoelectric conversion element into a digital signal, and then performs the logarithmic conversion of the reciprocal of the output to output it as a density signal.
As described above, 2 of R light and B light or R light and G light
Since the colored light is emitted simultaneously, the two-dimensional image sensor has a color separation filter so that two colors of light transmitted through the film can be measured simultaneously. The characteristic of this color separation filter has a wider spectral transmittance characteristic than the color separation filter in the light source section, and can be measured essentially without affecting the spectral distribution characteristics of the R, G and B lights. It is desirable that it has a characteristic. That is, a broad spectral sensitivity distribution or a block type spectral sensitivity distribution is preferable. In addition to the two-dimensional image sensor, or as a photometer, instead of the two-dimensional image sensor, a photoelectric sensor capable of averaged photometry of the filter screen, each of which is provided with a color separation filter having the above-mentioned characteristics of transmitting R, B, and G lights, is provided. You may comprise by a conversion element.

The characteristics of the infrared cut filter 12 are as shown by the one-dot chain line in FIG. 5 (3), and the relative spectral transmittances of the B, G, and R three-color photolysis filters are shown by the solid line in FIG. 5 (3). Like The relative sensitivity distribution obtained by applying the photometric color separation filter to the two-dimensional image sensor 28 is shown by the solid line in FIG. 5 (2), and the spectral energy distributions of the R, G, and B lights are the photometric decomposition filters. Since it is more sharp than the transmittance distribution of the above, the effective spectral sensitivity distribution of the two-dimensional image sensor 28 in the addition method is as shown by the broken line in FIG. 5 (2). The relative spectral sensitivity distribution of color paper is as shown by the solid line in FIG. 5 (1), and the spectral sensitivity distribution of color paper in the color addition method is as shown by the broken line in FIG. 5 (1). Thus, the photometric separation filter having a sufficiently wide spectral transmittance distribution and the sufficiently sharp exposure color separation filter make it possible to easily match the spectral sensitivity distributions of the color paper and the photometer. According to the apparatus of the present invention, the difference between the printing density of color paper and the measurement density of the photometric system can be made to be 0.01 for R, G, and B in optical density. In the subtractive color printer using this color separation filter as the color separation filter of the photometer, the density difference corresponding to the above becomes 0.14 at maximum, and the effectiveness of the present invention is recognized.

The two-dimensional image sensor 28 is a two-dimensional image sensor.
It is connected to a photometric value memory 30 which stores the density signal output from the sensor 28. The photometric value memory 30 is connected to the film type density storage memory 32 and the photometric value selecting means 38.
The film type concentration storage memory 32 has a film type classification means.
34 is connected, and the film type density accumulation memory 32 is connected to the photometric value selecting means 38 and the exposure amount correction value determining means 42 via the film characteristic determining means 36. The photometric value selecting means 38 is connected to the exposure amount determining means 44 via the exposure control value calculating means 40, and the film characteristic determining means 36 is connected to the exposure amount determining means 44 via the exposure amount correction value determining means 42. . A print condition input means 46 is connected to the exposure amount determining means 44 via a print condition memory 48. The exposure amount determining means 44 controls the exposure amount by controlling the motor 16 to rotate the rotary disk 14 and controlling a shutter (not shown) arranged on the entire surface of the R filter 17.

The operation of this embodiment will be described below while explaining each of the blocks shown in FIG.

The film type classifying means 34 classifies the films for each film type as the same film type for negative films having some common manufacturers, color materials, γ value, base density, photosensitivity, and shape of characteristic curve. . This film type classification means
34 is a DX code reading device that reads a DX code that has been pre-exposed on the edge of the negative film, and detects the peak value of the transmission density with respect to the characteristic wavelength of the negative film. A device or the like for reading characteristics can be used. In addition, the film type classification means
34 may be composed of a keyboard, and the film types may be classified by the operator's judgment and manually input.

The print condition input means 46 and the print condition memory 48 are
The print conditions of R, G, and B of a reference film type, for example, Super HR100 (trade name, manufactured by Fuji Photo Film Co., Ltd.) are input and stored. At least one of the exposure amount, the exposure time, the filter amount, the light source brightness, the light source voltage, and the slope control value can be used as the printing condition.

The film type concentration storage memory 32 is a film type classification means.
The output value from the photometric value memory 30 is accumulated and stored for each film type classified by 34.
The technique described in Japanese Patent Publication No. 267749 can be used. That is, the average negative density is obtained and stored by accumulating the densities of each photometric point, each screen portion, or the entire screen to obtain an average value.

The film characteristic determining means 36 determines the characteristic of the film in accordance with the R, G, B densities obtained by the film type concentration accumulation memory 32. Hereinafter, an example in which the gradient (γ value) of the film characteristic curve is used as the film characteristic will be described. First, each R, G, obtained in the film type concentration accumulation memory 32 with respect to a reference value (for example, G concentration or average concentration of R, G, B (R + G + B) / 3, etc.)
The characteristic curve of the film is obtained for each of R, G, and B by obtaining the ratio of B concentration. FIG. 6 (1) shows a characteristic curve of R concentration with respect to G concentration, and FIG. 6 (2) shows a characteristic curve of R concentration with respect to (R + G + B) / 3 concentration.

To determine the film characteristics from these characteristic curves, for example, as shown in FIG. 7 (1), the underexposure portion gradient γ _u and the overexposure portion gradient γ _o can be used. Further, the average value of the gradients (γ1 + γ2 + γ3) / 3 as shown in FIG. 7 (2) or the gradients γ1 and γ2 shown in FIG. 7 (3) can be used. In the above, the method for automatically obtaining the film characteristics by using the film type density accumulation memory 32 and the film characteristic determining means 36 is explained, but both means are omitted and the film characteristics are stored in advance (film characteristic memory means). Oxide film type classifying means reads from memory means exposure amount correction value determining means
42 and the photometric value selection means 38 may be input.

The exposure amount correction value determining means 42 is for calculating an exposure amount correction value from the film characteristics of the reference film type and the film characteristics of the film type to be printed among the film characteristics determined by the film characteristic determining means 36. In the following, an example will be described in which the γ value determined by the film characteristic determination means 36 as the film characteristic and the film type slope control magnification K _ji that corrects the slope control value as the exposure correction value are obtained.

The slope control magnification K _ji for each film type is the γ value (γ _j0 ) of the reference film type and the γ value (γ value of each film type.
_ji ) and the following formula.

K _ji = f _j (γ _ji , γ _j0 ) ... (1) where j is one of R, G and B, i is a film type, and i = 0 is a reference film type. Also,
F in the equation (1) indicates a function. Therefore, γ in the above equation (1)
_ji indicates the gradient of the i film species, and γ _j0 indicates the gradient of the reference film species.

Slope control magnification γ _ji based on equation (1) above
To obtain, underexposure and overexposure are calculated separately. The slope control magnification is expressed by the following equations (2) and (3), for example.

K _ji = a (γ _ji / γ _j0 ) (2) where a is a constant of 0 to 2.0, preferably 0.3 to 1.0, and R
It depends on G and B.

K _ji = (1-b) + b (γ _ji / γ _j0 ) ... (3) where b is a constant of 0 to 2.0, preferably 0.3 to 1.0, R,
It depends on G and B.

Therefore, the slope control magnification K _ji can correct the slope control value of the reference film type for each film type as needed. In addition, the slope that determines the slope control magnification is shown in FIG.
The gradient of (3) can be used.

In the above, an example of _obtaining the correction value for correcting the slope control value has been explained, but the gradient γ _ji and the gradient γ _j0
The exposure correction amount d _j may be obtained from the difference between and. Further, although an example of obtaining the slope control value and the correction value of the exposure correction amount from the gradient has been described above, the slope control value or the correction value of the exposure correction amount may be obtained using the density ratio or the density difference.

The photometric value selection unit 38 selects a photometric value used for the exposure control density value calculation. The photometric value corresponding to a specific color area, for example, a color area including a neutral color (gray) neighboring color and a skin color is measured. Select from memory. A method for extracting data corresponding to the specific color area will be described below. First,
Average negative film density R ₀ , G ₀ , B ₀ , D ₀ = (R ₀ + G ₀ +
The curve shown in FIG. 8 is created for each of R ₀ , G ₀ and B ₀ using B ₀ ) / 3. Further, in order to extract the data of the area close to the specific color area, the offset amount d ₁₁ , d
₁₂ , d ₂₁ , d ₂₂ , d ₃₁ , and d ₃₂ are defined for each of underexposure, normal exposure, and overexposure, and regions shown by broken lines in FIG. 8 are defined. Then, the average value D = (R + G + B) / 3 of the photometric values R, G, B is obtained, and it is determined whether or not the photometric value R for the average value D is included in the broken line in FIG. Similarly, it is determined whether the photometric values G and B are included in the area within the broken line in FIG. Photometric values R, G, B
All three colors are selected and used for exposure control density value calculation only when they are included in the areas defined as shown in FIG. 8 with respect to the average negative film densities R ₀ , G ₀ and B ₀ . . Note that, among the photometric values R, G, B, the photometric values not included in the above area are not used for the exposure control density value calculation. Further, the above-described offset amount d ₁₁ to d ₃₂ is changed by the film species or gradient _{R 0 / D 0, G 0} / D 0, B 0 / D 0 is preferable.

The measurement value may be selected as follows. That is, the characteristic curves described with reference to FIG. 8 for the average negative film densities R ₀ , G ₀ and B ₀ are determined as shown in FIG. -27352, convert it to D ₀ by the method as shown in Japanese Patent Publication No.
Find G'and B '. By this conversion, the photometric values having the same color balance as the average negative film have the same R ', G',
It is converted into the density of B '. And this R ', G', B '
Is determined on the chromaticity diagram for the exposure control density value calculation. In addition, the selection of the photometric value is made in JP-A-61-19814.
It also includes selective weighting of photometric values as in JP-A No. 4 and JP-A No. 61-223731.

The exposure control value calculating means 40 calculates the density value for exposure control using the photometric value selected by the photometric value selecting means 38, and is disclosed in JP-A 61-198144 and 61-22.
By the method as disclosed in Japanese Patent No. 3731 and Japanese Patent Laid-Open No. 61-232442, the photometric values are classified, and the density value for exposure control is calculated from the density value obtained based on the classified photometric values. That is,
As shown in FIG. 10, in step 100, the density value for each pixel is normalized by setting the point corresponding to the specific color area as the origin. In the next step 102, the normalized density values R ', G', B'are used to generate R'-G ', G'-.
Calculate B '. In the next step 104, a color area as shown in FIG. 11 is determined for each measurement point from the color coordinate table. Then, the color of the closed region on the color coordinates including the near neutral color and the flesh color, or the color of the closed region on the color coordinates including the near neutral color and the flesh color (for example, 0 in FIG. 11).
The measurement points belonging to the regions of (neutral color), 1 and 3 (skin color) are selected (the above is performed by the photometric value selection means). Add the density values of the selected measurement points before normalization,
The average value of each of R, G, and B is obtained, and this average value is used as the exposure control density value. Since this exposure control density value does not include a density value that causes a color area, it can be used for determining the exposure amount without lowering the degree of color correction (lowward collection).

The exposure amount determining means 44 is calculated by the print condition of the reference film type stored in the print condition memory 48, the exposure control density value calculated by the exposure control value calculating means 40, and the exposure amount correction value determining means 42. The exposure amount is determined by using the exposure amount correction value. When the slope control magnification is used as the exposure amount correction value, the exposure amount is calculated according to the following formula.

logE _ji = C _j · K _ji · S _j0 · (D _ji −D _j0N ) ＋ F _j ＋ d _ji (4) However, E _ji : exposure amount F _j : color paper, constant d _ji determined by automatic color photoprinting device : Exposure correction amount based on the image content D _j0N : Exposure control density value of the reference image of the reference film type (F ₀ ) D _ji : i Exposure control density value of the film type C _j : Color collection coefficient (≈1.0) j : One of R, G, B i: Film type (however, i = 0 is the reference film type) S _j0 : Slope control coefficient (= 0.5 to 2.0) K _ji : Slope control magnification (= 0.5 to 2.0) Specifically, the above equation (4) becomes the following equation (5).

In the above description, an example in which the exposure amount is calculated by using the correction value calculated by the exposure amount correction value determining means has been described, but this exposure amount correction value determining means is omitted and the film characteristic determining means is replaced by the direct exposure control value. The exposure control density value may be calculated by directly connecting to the calculation means and using the film characteristic difference. That is, the R concentration of i film type Fi
Since Di has the relationship shown in FIG. 12 with respect to the concentration of the reference film type F ₀ , when the concentration Di is smaller than the average concentration D _N , it is converted as shown in the following equation (6).

D ′ _i = D _N −K (γ _j0 / γ _ji ) (D _N −D _i ) ... (6) where j = R, γ _j0 is the gradient of the reference film species, γ _ji is the gradient of the i film species, K is a constant (may be changed depending on the film type).

Then, the value Di 'converted by the equation (6) is used as the exposure control density value of the i film type Fi. In general, the above equation (6) can be expressed as the following equation (7).

D ′ _ji = g _j (γ _ji , γ _j0 , D _ij ) (7) As described above, when Di <D _N , the characteristic curve of the i film type is corrected by the above equation (6), The characteristic curve of the reference film type and the characteristic curve of the i film type are substantially parallel to each other, so that the i film type can be printed according to the printing conditions of the reference film type. In the above, R and B are corrected centering on G, but (R +
You may make it correct on the basis of G + B) / 3.

As described above, according to the present embodiment, it is possible to print various films satisfactorily by correcting the print conditions of the reference film type according to the film characteristics, and therefore, it is only necessary to determine the print conditions of the reference film type to determine the print conditions of the various film types. Printing from underexposure to overexposure can be performed with high quality. Also, since various films are printed based on the print conditions of the standard film type, even if various characteristics of the negative developing machine, the negative film, the automatic color photographic printing device, etc. are changed, one printing condition is set. That is, since it is sufficient to manage only the print conditions of the reference film type, proper management can be easily performed. In addition, since appropriate conditions are automatically corrected for each film type, appropriate prints can be produced for various films. The above has mainly described the configuration and operation of the means necessary to realize fully automatic exposure based on scanning photometry. However, the effect of the present invention is not lost even if the subject dependency in the image is visually determined and the correction is performed manually, even if it is not fully automatic. In this case, not all of the means shown in FIG. 1 are necessarily required, but they should be selected by automation and required accuracy.

In the above, the mixing method of the simultaneous color addition method and the sequential color addition method in which the two colors are measured and exposed simultaneously has been described. However, the present invention can be applied to a method of simultaneously performing photometry / exposure using three light sources of an R light source, a G light source, and a B light source as well as to a method of sequentially performing photometry / exposure using one light source. Further, although the two-dimensional image sensor is used as the sensor sensor for scanning photometry, the present invention is not limited to this.

In the present invention, a method of automatically determining a print condition correction amount or a corrected print condition for each film type based on the reference film type print condition and printing, and a print condition or reference for each film type A method of determining the modified print condition for the print condition based on the print may be selected. In this case, the modified print conditions may be stored in an IC card or an LSI card and read by the film type classification means. As described above, various combinations of the present invention and the conventional system are conceivable, but these are merely applications of the present invention.

[Brief description of drawings]

FIG. 1 is a schematic view showing a color-adding type automatic color photographic printing apparatus to which the present invention is applicable, FIG. 2 is a plan view of the rotary disk of FIG. 1, and FIG. 3 is a schematic view of the filter of FIG. 4 (1), (2), and (3) are diagrams showing the characteristics of the R filter, and FIGS. 5 (1), (2), and (3) are color papers in the addition method and a two-dimensional image sensor. Showing the spectral sensitivity distribution, etc., FIGS. 6 (1) and 6 (2) are diagrams showing examples of characteristic curves, and FIGS. 7 (1), (2) and (3) are for explaining film characteristics. Fig. 8 is a diagram showing the area for selecting photometric values, Fig. 9 is a diagram of curves for converting photometric values, and Fig. 10
The figure shows the flow chart for obtaining the density value for exposure control.
FIG. 11 is a diagram showing a color region, and FIG. 12 is a diagram showing R characteristic curves of two film types. 14 …… Rotating disk, 21 …… Colored glass, 23 …… White glass, 25 …… Dielectric multilayer film.

Claims (1)

[Claims] 1. White light by a red, green, and blue color separation filter provided with a colored glass and a dielectric multi-layer film in which a transmission wavelength band is included in each light-sensitive wavelength region of the red, green, and blue light-sensitive layers of color paper. From the red, green, and blue light to the color filter and irradiate the color filter, and the spectral transmittance of the color separation filter that measures the red, green, and blue light emitted from the light source and transmitted through the color film. A photometer having a spectral sensitivity distribution with a half-value width equal to or greater than the half-value width of the distribution, and control for controlling the exposure amount based on preset reference print conditions and the photometric value measured by the photometer And a color photographic printing apparatus including the means.