JPS6380242A - Photograph printing machine - Google Patents

Abstract

PURPOSE:To constitute the titled machine so that even a beginner can obtain a print of a high quality and a high acceptance rate, by giving a correction quantity to a fundamental exposure quantity which has been derived by an average density photometry, by selecting a density correcting key or an exclusive key, or its combination. CONSTITUTION:A correction quantity is derived by a prescribed operational expression in accordance with each key input. That is to say, a minus density key, a density key '0', and a plus density key are used for a classification group for decreasing an exposure quantity, a classification group for changing no exposure quantity, and a classification group for increasing the exposure quantity, respectively. A correction by a density correcting key 31, and a correction by the density correcting key 31 or an exclusive key, based on a classification of a negative film can be utilized selectively, therefore, even a non-expert or a beginner can obtain a high print acceptance rate by an operation of an automatic deciding part, and also, an expert can also obtain a print of a high quality and a high acceptance rate by an operation of the automatic deciding part.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a photographic printing machine that can efficiently and easily determine the amount of printing exposure.

(Technical background and problems to be solved) The determination of the printing exposure amount of color film is usually done by LATD.
(average transmission density of the entire screen). However, in reality, only about 70% of the exposure amount determination using LATD is satisfactory, and an operator can measure the negative at the stage before the LATD measuring tip (before exposure at the preliminary inspection device or the exposure front face of the printer). Observe the film and determine the L.
Correction exposure amount (or exposure correction amount, etc.) for ATD exposure point, usually density key, color key, function key,
(based on a color correction key, etc.), and the two are added to perform exposure. FIG. 1 shows an example of the relationship between the density correction key and the corresponding exposure amount. Normally, the exposure amount is set to change by 20 zeros by changing one density correction key. However, this method requires long experience and
The disadvantages are that it takes several years to become skilled, the print quality obtained tends to vary between individuals or due to fatigue, and there are significant restrictions on working conditions such as at night. Also,
There are disadvantages such as losing the experience after long training when changing jobs or resigning, and the reality is that a way out of this method is being sought.

As a solution to this problem, an automatic judgment method has been proposed in which the film screen is divided into small pixels and photoelectrically scanned, and the exposure amount is determined by analyzing the resulting density values and combining the data. However, with such fully automatic correction, it is not possible to obtain sufficiently satisfactory quality for all prints. Also, JP-A-51-1503
In Publication No. 36, the density area and overexposure/underexposure are identified and their classification information is manually stored. Based on this classification information, the lowest density of a part of the shadow is determined when the average density is high, and the high density area is determined when the average density is low. The exposure amount is determined by finding the maximum density of each light area. That is, by specifying the density area by visual judgment, when the average density is high, it is assumed that there is a subject in a part of the shadow, and the exposure amount is determined at the lowest density. However, when the average density is high, it cannot necessarily be said that there is a subject in a part of the shadow, and even if there is a subject in a part of the shadow, determining the exposure amount based on the lowest density will result in a big error. .

This is because the minimum density is often equal to the fog density of the image and is a small value that is relevant to the subject matter. In addition, in the inspection device disclosed in Japanese Patent Application Laid-open No. 52-62428, the circuit is switched by pressing a button to rotate the film image in the reverse position or vertical position by 90 degrees or 180 degrees and return to the normal position by visual judgment. That's what I do. but,
This method does not determine the feature amount in relation to the subject matter, but merely rotates the object to bring it to the correct position.

Furthermore, the density correction amount based on the scanning data is predicted and visually judged, and the automatic judgment result is corrected (Japanese Patent Laid-Open No. 48-98821, Japanese Patent Laid-open No. 52-62429, etc.).
is already known, but it has the disadvantage that it requires two judgments: one to judge whether correction is necessary or not, and one to judge the amount of correction.It also has the disadvantage that it requires skill and does not increase the pass rate or processing capacity. be. In particular, it is extremely difficult to predict the results of complicated automatic determination operations. In order to improve the correction amount determination, scene type information (e.g. strobe, open scene, snow, etc.) is visually determined for scenes that are not suitable for automatic determination, and the automatic determination results are corrected by a predetermined amount depending on the scene type. It is possible to do so.

However, in automatic judgment, strobe negatives generally tend to have insufficient density, but since there are many normal and too dark strobe negatives, there is the possibility of over-correction. Furthermore, the above-mentioned scene type information has drawbacks such as individual differences in scene definitions and the need to assume a large number of scenes. For example, even though we call it a strobe scene, it is better to think of completely different types of scenes when the background is a white wall, when the background is furniture, when the background is dark, and when the background is close-up. The reason for this is that no information about the subject matter is included.

Here, as a result of investigating the deviation from the optimal corrected exposure amount between a large number of experts and non-experts, we found that even among experts there is considerable variation in patterns and between individuals. About 98% of the judgments are based on the optimal corrected exposure amount (Ot), and the variation is within ±50%, whereas for unskilled people, the variation is up to about ±70%. In addition, in FIG. 2, characteristic I indicates an expert, and characteristic 1 indicates an expert for those requiring an increase in the exposure amount for the LATD exposure point.
1 indicates an unskilled person. In addition, both skilled and unskilled people tend to fall short of the optimal corrected exposure amount.
There is a tendency that the shortage is larger for non-experts, and that increasing the corrected exposure amount is more likely to cause variation than decreasing it.

As described above, the conventional automatic judgment method by inputting visual judgment information is based on the premise that the automatic judgment section will make the judgment automatically, and the only way to do so is to input the correction amount for the automatic judgment as an auxiliary in case of inconvenience. Therefore, its effectiveness is limited. In addition, the visual judgment information is the pattern of the negative film and does not include the density information of the main part or has only a small amount of that information, so the effect of the visual judgment information is small.
There is a drawback that the improvement in yield obtained is also small. As described above, it can be said that the fully automatic determination and the assistance of the fully automatic determination and the visual determination information have not yet reached the level of quickly producing high-quality, low-priced prints at present. In addition, in small photo labs, it is more important to have a method that allows even slow or unskilled workers to consistently produce prints of high quality and a high pass rate. Proposals for methods are requested. Furthermore, in the case of a scene where, for example, a small person in front of a shrine or temple is illuminated by a spotlight, it was necessary to have the feature of being able to make detailed exposure decisions by correcting the density correction key.

(Objective of the Invention) As described above, the object of the present invention is to enable even unskilled or beginners to obtain a high print pass rate by operating the automatic judgment section, and to enable even experienced persons to obtain a high print pass rate by operating the automatic judgment section.
The goal is to enable printing with higher quality and higher pass rates than ever before. Another object of the present invention is to provide a photoprinting machine that reduces fatigue during visual judgment work and improves throughput.

(Means for Solving the Problems) The present invention relates to a photoprinting machine, and the above-mentioned objects of the present invention include a photometric section for photometrically measuring a negative film, and an average density and a maximum density according to the photometric values of this photometric section. , a characteristic value detection means for determining a characteristic value such as a minimum density, an exposure amount determining means for determining a basic exposure amount based on the average density, and an input key means for inputting a judgment result regarding the density by visual judgment of the negative film. a correction ffi conversion means for calculating an exposure correction amount according to input information from the input key means; and a correction ffi conversion means for calculating an exposure correction amount by selecting one of the exposure calculation formulas according to the input information and substituting the characteristic value. a selection means for selecting whether to use the correction amount conversion means or the correction amount determination means; and printing exposure by applying the exposure correction amount selected by the selection means to the basic exposure amount. This is achieved by providing a printing exposure amount determining means for determining the printing exposure amount, and an exposure control section for controlling the exposure according to the printing exposure amount.

(Function of the Invention) In the present invention, a correction amount is given to the basic exposure amount obtained by average density photometry such as LATD using a density correction key, a dedicated key, or a combination thereof and a selection switch. The correction amount is calculated using a predetermined calculation formula in accordance with each key input. Since the key input is made according to the classification of the negative film based on the visual judgment of the negative film, even beginners can print with high quality and a high pass rate.

(Embodiment of the invention) FIG. 3 shows an example of the configuration of a photoprinting machine according to the invention.
A negative film l is mounted in a predetermined print section and is irradiated by a light source 3 through a mirror box 2, and the transmitted light passes through a lens system 4 and a shutter 5 and is imaged on photographic paper 6. . Further, a filter for color dimming is arranged between the mirror box 2 and the light source 3, and the sight of the light source 3 is detected by the sensor 3^, and the LATD, maximum degree, minimum degree, etc. of the negative film 1 are detected. The characteristic values such as density are determined by R (red) and G of the i111 part light arranged around the lens system 4.
(garlic) and B (blue) by scanning with three color sensors, and the light amount signal EM and photometric data C5 are respectively input to the control unit IO. Furthermore, the photographic paper 6 is wound around a reel 6A, the printed photographic paper 6 is wound onto a take-up reel 6B via a drive section 20, and the shutter 5 is wound around a shutter control section 21. The exposure is controlled by the lens system 4, the focus of the lens system 4 is adjusted for image formation by the focus adjustment section 22, the filter 7 is controlled via the filter control section 23, and the light source 3 is controlled via the light amount control section 24. 20 to 24 are controlled by a control unit IO. A keyboard 30 is connected to the control unit IO, and as shown in FIG. 4, the keyboard 30 includes a density correction key 31 that is operated to visually judge the negative film 1 and adjust the print density, and a density correction key 31 that will be described later. Two control methods,
That is, a selection switch 32 is provided for selecting either normal density correction (hereinafter referred to as normal correction) or classification correction. The configuration of the portion of the control unit 10 related to exposure control is as shown in FIG.

-4”,..., “-1”, “0”, “+1”,・
..., "°+9") D, and the selection signal SL from the selection switch 32 is input, and the photometry data C from the photometry section 8 is input.
S is input to the characteristic value detection section 15, and the detected characteristic value C
V is input to the exposure amount determining section 13 and the exposure calculation formula determining section 14. The characteristic value CV is the known screen average density, maximum density,
fx small concentration, etc. When normal correction is selected with the selection switch 32, the density key information is directly outputted from the control method selection section 11 and inputted to the conversion section 12, and the correction amount CM converted by the conversion section 12 is sent to the exposure amount determination section. 13 and the determined exposure amount EXI is input to the exposure control section 16 together with the characteristic value CV. When classification correction is selected with the selection switch 32, the input density key information OK is converted to classification information 0 to 8, and input to the exposure calculation formula determining unit 14;
A plurality of exposure calculation formulas prepared in advance are selected, and the exposure iEX2 is calculated together with the characteristic value CV and input to the exposure control section 16. The exposure control section 16 controls the light amount control section 24 and/or the shutter control section 21 and/or the filter control section 23 according to the input exposure amount EXI or EX2, and controls the light amount of the light source 3, the opening time of the shutter 5, and the color dimming filter filter. The opening amount is controlled. Note that the selection switch 32 may be operated manually or automatically. The density key information is the density correction key 3 as described above.
1, or a dedicated key for correction, that is, for selecting one of the exposure calculation formulas, may be provided separately. In addition, the density key information is displayed on the keyboard 30.
Instead of being input using a correction key information recording medium (for example, paper tape, magnetic tape, etc.), the information may be input using an information reading device. In this case, the method selection information can be recorded as the large blade tip information of the paper tape, for example.

In such a configuration, the operation when normal correction is selected by the selection switch 32 will be described first.

In this case, the photometric data CS obtained by the scanning of the photometric section 8 is input to the characteristic value detection section 15, and the characteristic value CV necessary for determining and correcting the exposure amount is calculated, and the exposure amount determining section 13 and the exposure calculation formula It is input to the determining section 14. Then, the operator visually determines the negative film 1 and sets it as correction exposure information in 15 steps (in this example, 15
(The number of steps is arbitrary) Density correction key 3
Input the density key information in step 1. The density key information DK input in this way passes through the control method selection section 11 and is inputted to the conversion section 12, and, for example, is sent to the commercial operator as 0K.
It is corrected and converted to 1 cu using the conversion formula (1). Here, the density key information OK is a value from °-5' to °°+9'', a positive value indicates an increase in exposure, a negative value indicates a decrease in exposure, and 0'' indicates a main part. This shows a standard negative in which the background is of similar density. Further, the constant represents the degree of change in exposure amount; for example, if the change is 20%, it is set to '1.20°. The correction fficM obtained by the above equation (1) in the conversion unit 12 is input to the exposure amount determination unit 13, and is calculated as, for example, EX1= EF-CM ・・--- River・−(2
) to find the final exposure 1EXt. The exposure amount EXI thus determined is input to the exposure control section 16, and the light source 3 and/or shutter 5 are controlled to print the negative film 1.

Next, the operation when classification correction is selected by the selection switch 32 will be described.

In this case, as in the above-mentioned normal correction, first, the negative film 1 is divided into many small areas and scanned to obtain the characteristic value Cv, and the density is determined in order to classify the negative film 1 by visual judgment by the operator. Operate the correction key 31. In this case, the density key information input during the normal correction described above may be used as is. In other words, the density key information input for density correction is used as is for classifying the negative film l. The density correction key information is converted into a classification signal OK8 according to a predetermined correspondence relationship. For example, as shown in FIG. 5(A), the "-5" key of the density correction key information DK
-1" key to DKAI, "ON key to DMA2, °
゛◆1"◆1" key 3, "+2" key or more key DKA4
Convert to In this way, the density correction key information DK is converted into another code and used as the classification signal OK^. Also,
The density correction key information DK may be used as it is as the classification signal DKA.

The classification of negative film l may be based on information visually determined or by including the characteristic value Cv obtained by scanning.
After this classification, one of the calculation formulas for determining the exposure amount preset in the exposure calculation formula determination unit 14 is selected using the classification signal 0 and A outputted from the control method selection unit 11. The exposure amount is determined using the characteristic value CV using the calculated formula.

In addition, in order to perform high-speed processing with a high pass rate even for unskilled people, the classification of negative film l must be at least 6 types (preferably 4 types or less) with an exposure change rate of at least 60% or more (preferably 10096 or more). It is better to classify In addition, for the calculation of the exposure calculation formula determining section 14, for example,
A known arithmetic expression such as that shown in Japanese Patent Application Laid-open No. 131 or JP-A-52-23936 may be used, and the coefficients and Some of the characteristic values may be used differently. That is, the images are roughly classified based on the density key information through visual judgment, and the final exposure amount EX2 is determined by calculating an accurate exposure amount using the scanning characteristic value Cv.

Even if the arithmetic expression selected by the classification signal DKA is an arithmetic expression that includes the above-mentioned basic exposure amount like the above-mentioned known arithmetic expression,
Alternatively, an exposure amount correction formula for one basic exposure formula may be used.

FIG. 5 (8) shows density key information D input by visual judgment.
This shows the relationship between the classification by K and the selection of the set calculation formula.Four types of calculation formulas (formula a to formula d) are stored in the determination unit 14, and the value according to the density key information is Accordingly, the classification signal DKA (DKAI to DKA4) is outputted, and the exposure amount calculation formula determining unit 14 uses the classification signal 0KAI to DK84.
Each of the arithmetic expressions a to d is selected. Therefore, when the density key information DK determined by visual judgment for the negative film 1 is -1'', the classification signal 0KAI is output from the control method selection section 11, and formula a is used to calculate the exposure amount. The characteristic value Cv obtained by the scanning of the photometer 8 is substituted, and the negative film 1 is printed with the obtained exposure amount.When the density key information DK determined by visual judgment is "-2'°, It can be used to reduce the constant exposure amount based on the calculation result.

FIG. 5 ([1)] is an example showing the key input relationship between normal correction and classification correction using the conventional density correction key.

Normally, for negative films that require proper key input of the "-1" key or less (correction amount ≤ -3H) for key correction, the classification signal will be 0 even if you press any key below the "-1" key for classification correction.
KAI is output, and an appropriate exposure correction amount or exposure amount is determined by the arithmetic expression a. “−2°° key” with normal correction
For negative films that require an appropriate key input among the “+2” keys (-504k<correction amount≦+50t), for classification correction, you only need to press the “0°°” key, and 2 is output to the classification signal. An arithmetic expression is selected and an appropriate exposure correction amount or exposure amount is determined. In this case, in the conventional normal correction, it was necessary to select one of the five correction keys, but in the classification correction, this is not necessary. Other key inputs for classification correction are similarly shown in FIG. 5(B).

FIG. 5(C) shows the classification signals DKAI to D in classification correction.
When ^4 is input from the density correction key to the 0 classification numbers 0KAI to D, which show KA4 and the resulting changes in exposure amount, the characteristics of the classification correction are clear when compared with the normal correction shown in Figure 1. . In other words, in normal correction, one exposure change amount is determined for one density key information, but in classification correction, the exposure change amount changes for one density key information depending on the characteristics of the negative film to be printed, and each An appropriate amount of exposure change is determined for negative film. The difference in slope between the -dotted chain line DOL and the solid line for each classification correction in FIG. suggests that it will not. Therefore, by appropriately selecting and using a plurality of exposure calculation formulas, it becomes possible to obtain an unprecedentedly high pass rate.

Next, an example of the pass rate when the above method is actually used is as follows.

Pass rate) Subject group assumed to have "correction amount ≦ ~ -3096" ... 95.1% i - a formula % formula t" subject group assumed ... 93.8k - b formula %
Subject group assumed to be 'formula % t'...90.3! ni → C formula (i
v) Subject group assumed to be "r+llo zero correction amount"...95.7! → d formula % formula % Here, the pass rate judged by an expert was 91.4%F, so this method has a higher pass rate and higher quality than the conventional visual judgment of 100%. It can be seen that the following can be obtained. If each negative film is visually judged accurately as shown in FIG. 5(B), it is possible to obtain an even higher pass rate. Moreover, since the determination process is easy,
Work efficiency can be increased and individual differences can be reduced.

In the evaluation of this invention, if the rate of change in exposure can be classified at intervals of 6096, it should be possible to obtain a pass rate of 1QOk (with the optimum value ±3096 as the pass range) without any calculations, but even an expert would be able to It can only be determined with such precision. Classification with a narrow rate of change (for example, 6096 intervals) includes classification errors and is unlikely to lead to an increase in the pass rate, and has the drawback of decreasing the pass rate for non-skilled users. Therefore, scenes corresponding to the exposure correction area covering a change rate of 6 or more (preferably 1001 or more) are classified into the same category, and then the appropriate correction exposure amount for LATD is calculated by a calculation formula, or the final exposure is directly performed. The amount can be determined using an arithmetic expression. In addition, although the above explanation has been based on the corrected exposure amount for ease of explanation, there are also scenes in which the exposure amount is reduced for the subject group (i), scenes in which the subject group (ii) does not require correction, The subject group (iii) may be classified as a scene in which the amount of correction is increased, and the subject group (1v) may be classified as a scene in which the amount of exposure is greatly increased.

Conventionally, the exposure correction amount is determined immediately based on the subject and background of the subject by visual judgment, which causes individual differences and difficulty in judgment as described above. However, since this invention uses visual judgment only for classification, it does not require that much accuracy.
A high print success rate can be obtained. By using the classification information corresponding to the exposure correction amount, it is possible to collect scenes with similar subject densities, which means that the phenomenon of the correction exposure amount mainly exists on the shadow side.
The accuracy of the arithmetic expression of the automatic determination section can be dramatically improved. Furthermore, scanning data may be used for classification in addition to visual judgment information, and in that case, the characteristic values are:
Contrast information can include position information for one screen (e.g. density at the center of the screen), skin information for one screen, color information, main part or unnecessary part information, and when using contrast information and skin information, for example, as shown in Fig. 6. The burial will be as shown. That is, the above formula a is divided into formulas 81 and 82 depending on the presence or absence of contrast, and the above formula is divided into formula b1 and formula b2 depending on the presence or absence of skin, and it is determined that formula a is selected in step Sl. At times, the presence or absence of contrast is determined (step S4), and when there is contrast, the at formula is used, and when there is no contrast, the 82 formula is used. Similarly, after determining that the b formula is selected in step S2, it is determined whether there is skin or not (step S3), and if there is skin, using the b1 formula,
If there is no skin, use the b2 formula. and,
In step S5, the selection of the 0 formula and the d formula is determined.

By the way, as mentioned above, regarding the exposure correction amount by visual judgment, the density key information O for the exposure amount by the basic exposure formula
K is used, but for experts the variation is almost +50
%, whereas for unskilled people the increase is around +70%. Therefore, it is better to prepare exposure calculation formulas with different accuracy of classification information and use them according to each person's level of proficiency. Experimental data for a negative with 2000 frames that passed within the optimum exposure value ±30% are described below.

Pass rate level A a) Group expected to have r correction amount ≦-30%...
・95.1%b)r-50%Correction amount≦+5θ%...93.8%C)r
Group expected to have +30% correction amount < +130%FJ...9o, 3%d)
Group assumed to have r + ll064<correction amount...95.7% Total 93.8% Level B a) Group assumed to have correction ffi<096j...
・92.0% b) r-60% - Group expected to have correction amount <+60J ...91.8% c) r
Group expected to have +20% correction amount < + 140 scoops...88.7%d) r
+ 100t<correction amount” group...
92.1% Total 91.5% Level C a) Group assumed to be r correction amount 0 leopard...92
．． 0% b)r-70% Correction amount <+70%"...89.6%c)r
+20% correction amount < + 140 group assumed to be leopard...88.7%d),
Group where r + IOn<correction amount” is assumed...
92.1% Total 89.8% The above level A is for experts, level B and level C
The criteria for beginners is defined by the corrected exposure amount, level A requires the definition of input groups and high discrimination accuracy between groups, and level B requires the definition of input groups and θ. This is a case where the high discrimination accuracy between groups is reduced. Level C is for beginners, with the accuracy of determining whether correction is required or not required further reduced. Here, the pass rate for experts using the conventional method is 91.496.
Level A can produce prints of higher quality than before, and beginners can achieve performance close to that of experts by using the calculation formula within the correction amount range of level C. . Furthermore, for experienced users, the correction exposure range is set to be the same as level A, and the number of levels is increased! By increasing the grade to 0, the pass rate reaches 95.2%F. According to actual print evaluation, this value is a pass rate close to 100*, and the effect of the present invention is remarkable. In this case, the operator can use the 10 to 15-level classification that is normally performed, and there is no problem with deterioration of processing ability or learning.

Further, in the above level ANC, the exposure correction amount is shown for ease of explanation, but in reality, the density correction key may be input based on the following criteria.

(1) Decrease the exposure compensation amount... Groups with backlight, snow, low contrast, etc. (2) Change the exposure compensation amount... Groups with no normal scenes (3) Increase the exposure compensation amount... Strobe , Group scenes with dark backgrounds (4) Increase the exposure compensation amount greatly... Groups with dark backgrounds, robots, fireworks, etc. For simple situations like this, the appropriate exposure amount can be determined just by classifying them according to the criteria. Become so. In the conventional normal correction method using the density correction key, it was not possible to determine the exposure correction amount using such a simple criterion.

Since the main parts of conventional characteristic values for calculation are not estimated,
Whereas the characteristic values were obtained from the entire screen, the correlation between the characteristic values and the concentration of the main part becomes higher by examining the density range where the main part exists in detail and selecting the characteristic value using visual judgment information. , it becomes possible to determine a better exposure amount. For example, when the main part is known to exist in the shadow side of the image (negative film where the exposure compensation amount needs to be reduced), information on the highlight side is mainly unnecessary, and in the case of a portrait by a window. The contrast is very large, the maximum density is high, and the central part has a higher density than the peripheral part, and the characteristic values are similar to those in which the main part is on the highlight side, so it is difficult to obtain a sufficiently appropriate calculation result. However, by using the coefficients and characteristic values of the calculation formula that takes into account the main density in advance as in this invention, it becomes possible to determine the appropriate exposure amount from the calculation formula, resulting in a high pass rate and high quality prints. becomes possible.

In addition, in the case of classification correction described above, an arithmetic expression is selected using the classification signal DMA, and the final exposure i is determined using the detected characteristic value CV.
EX2 is calculated, but the exposure correction amount (EX
2) may be obtained.

In addition, in the above, there are four types of exposure calculation formulas set in advance, a to d, but the number of formulas is arbitrary, and the format of the classification signal DKA for input density key information and the calculation formula for classification The selection can also be changed arbitrarily. Furthermore, although the density key information from the density correction key 31 is used to generate the classification signal DK, another key is used to generate the density key information of the main part of the negative film and the density key information of the background. You may also classify by inputting the information. In addition, density correction key 3
1 is used for other purposes such as a color key in addition to the density key, so even if it has a different name (for example, Denki), it is simply a difference in name and is naturally included in the present invention. .

(Effects of the Invention) As described above, according to the photoprinting machine of the present invention, correction using the conventional density correction key and correction using the density correction key or dedicated key based on the classification of negative film can be selected. It is convenient for operators and others because it can be used in a variety of ways, and it has the advantage of being able to plan its use in accordance with the actual usage situation.

In other words, a negative density key is set for the taxonomic group that decreases the exposure amount, and a density key "0' is set for the taxonomic group that does not change the exposure amount.
.

By using the plus density key for each taxonomic group that increases the exposure value, the correction using the conventional density key is made common both in terms of operation and visual judgment, so that it can be used easily by experienced users and by beginners. can also be used with conventional training. Furthermore, since both types can be used with the same information, the input section can be shared.

Furthermore, this invention can reduce the classification of negative films,
Even beginners can achieve the same printing pass rate as experts. Furthermore, while the conventional printing limit was 30,000 frames per person per day, this invention has made it possible to print more than 70,000 frames per person per day. The determination speed has also been improved, 30 to 50% faster than conventional methods.

[Brief explanation of the drawing]

Fig. 1 is a diagram for explaining the conventional method of determining the printing exposure amount, Fig. 2 is a diagram for explaining the difference in the amount of correction by an expert and an unskilled person, and Fig. 3 is a diagram according to the present invention. FIG. 4 is a block diagram showing a part of the photo printing machine in detail, and FIGS. 5 (8) to (C) are for explaining the operating principle of this invention in comparison with a conventional example. , and FIG. 6 are flowcharts thereof. 1... Negative film, 2... Mirror box, 3.
・・Light source, 4・Lens system, 5・Shutter, 6・
... Photographic paper, 7... Filter, 8... Photometering section, lO
...control section, 11...control method selection section, 12...
Conversion unit, 13... Exposure amount determination unit, 14... Exposure calculation formula determination unit, 15... Characteristic value detection unit, 20... Drive unit, 30... Keyboard, 31... Density correction key, 3
2...Selection switch. Applicant's agent Yuzo Yasugata, 1 tea figure!烙2已3 匡DKA (A) 蓓(,a) Key input (C
)

Claims (5)

[Claims] (1) A photometric section for photometrically measuring a negative film; a characteristic value detecting means for determining characteristic values such as average density, maximum density, and minimum density according to the photometric values of this photometric section; an exposure amount determining means for determining the exposure amount; an input key means for inputting a judgment result regarding the density by visual judgment of the negative film; and a correction amount conversion means for calculating the exposure correction amount according to the input information from the input key means; Which of the correction amount determining means for determining the exposure correction amount by selecting one of the exposure calculation formulas according to the input information and substituting the characteristic value, the correction amount conversion means, or the correction amount determining means is used. a selection means for selecting a printing exposure amount, and a printing exposure amount determining means for determining a printing exposure amount by applying the exposure correction amount selected by the selection means to the basic exposure amount;
A photographic printing machine comprising: an exposure control section that controls exposure according to the printing exposure amount. (2) The photographic printer according to claim 1, wherein the input key means is a density correction key. (3) The photographic printing machine according to claim 1, wherein the input key means is a dedicated key corresponding to the exposure calculation formula. (4) The input key means comprises a density correction key and a dedicated key corresponding to the exposure calculation formula, one of which is selected and used with a selection switch. Photo printing machine. (5) The photographic printing machine according to claim 1, wherein the visual judgment is an increase/decrease or a degree thereof with respect to the basic exposure amount.