JPH05127273A - Method for deciding correction amount of printing photograph - Google Patents

Abstract

PURPOSE:To prevent the dispersion of quality by collating a film which is enlarged and printed with a variable density scale and finding out the scale having the same variable density. CONSTITUTION:The film which is enlarged and printed by an enlarger-printer 22 is compared and collated with the monochrome or color variable density scale on a digitizer, and the scale of the same density is found out and specified on the digitizer, so that the correction amount of a filter and exposure corresponding to the scale are obtained. In the case that color correction must be still added to a printed image which is test-printed, the printed image obtained by test printing is compared and collated with the color map and a positive image expressing equal color tone is found out on the scale and the position thereof is specified by the digitizer, thereby obtaining the correction amount of the filter and the exposure corresponding to it. Thus, since individual difference is comparatively restrained and the correction amount of the filter and the exposure in the case of enlarging and exposing are correctly decided, the dispersion of the quality is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relies on the subjective and sensual skills of each worker in determining the printing data such as the correction amount and exposure amount of the film for each film that has been photographed when the image is enlarged and printed. We provide a method for objectively quantifying each amount in the field of application, and at the same time, by using a computer to search for the necessary data interactively, the reliable determination of printing data and the standardization of its work can be performed. It is made possible and is used in a large-scale and large-scale drawing and printing shop (commonly called a pro lab to distinguish it from amateurs who mainly handle service size in the city).

[0002]

2. Description of the Related Art Conventionally, in a professional laboratory, at the beginning of the work of stretching and printing a photograph, the photographed film is observed,
By obtaining information such as the film format, the color temperature of the light source at the time of shooting, the amount of exposure given to the film, and the light and shade, the printing data is determined based on the scale of each worker to obtain the desired printing quality. I was going. In addition, there are inherent device differences in the stretch printing machine, and in order to improve the quality of the finish, a test print is made, which is evaluated by experience and intuition to finally determine the correction amount and exposure amount of the filter. It was stretched and baked to ensure product quality. Since work depends on skills based on individual subjectivity and intuition in this way, variations in product quality cannot be avoided, and it is difficult to rationalize work and develop human resources, and the need for improvement is strongly pointed out. It was

[0003]

DISCLOSURE OF THE INVENTION In order to solve the above-mentioned difficulties, the present invention has been made, which is carried out as follows. (1) A tone scale for comparing and comparing the film to be stretched and printed and the tone is created, and the optimum filter correction amount and exposure amount which are obtained in advance are found correspondingly. (2) A color map for comparing and collating the color tone with the test print obtained from the stretched and printed film is created and the optimum filter correction amount and exposure amount given in advance are found. (3) In the automatic stretch printing machine, the filter correction amount obtained by the above method and the correction amount based on the following features can be used together. In the automatic stretch printing machine, the color negative film transmits red, green, and blue color light as the entire screen, but it is assumed that the mixture of all transmitted light has a hue of gray or close to it. Say). Therefore, it is necessary to use the following correction together. 1) Variable correction The filter correction amount is determined from the red, green, and blue light amounts detected after passing through the negative film and the integrated neutral value. Therefore, when either the main subject or the background is different from the average color tone of the entire screen, the average transmitted light density is biased to the complementary color of the negative film in which the image is photographed. If it is stretched and printed as it is, the color balance becomes improper (color ferria). In order to compensate for this weakness, representative screens are classified and statistically based on many tests and empirical values, a correction value that intentionally moves the concentration value of integral neutrality is obtained. Subject collections that finely classify the subject, illumination ferria caused by light source differences, etc. are also corrected by almost the same method. In either case, the corresponding screen or symbol on the digitizer is designated and set.
(See Fig. 3) 2) Film type collection The value that corrects the characteristic peculiar to the negative film based on the difference of the film base is empirically obtained and stored, and the film is designated and set on the digitizer. (4) On the digitizer, which is a type of computer input device, specify the screen to be stretched and the same shade or color tone as the test print on the shade scale or color map, or specify various correction values. By doing so, the optimum filter correction amount and exposure amount stored in advance in the computer are read out, and the correction amount or exposure amount is set in the enlargement printing machine manually or by the communication function.

[0004]

[Means for Solving the Problems]

(1) Method of creating gray scale and determining filter correction amount Monochrome negative film, color negative film, and color positive film are created to determine the filter correction amount and exposure amount necessary for stretching and printing. This is a group of mainly developed film samples having different shades. For these, the filter correction amount and the exposure amount for completing the appropriate stretch printing are obtained. 1) Monochrome negative film A typical subject is exposed with standard exposure, and the standard development processing is performed on the standard negative film. After exposure, a series of standard-developed films (reference numerals 1, 2, and 3 in FIG. 1) are prepared. The exposure time and the aperture value of the lens at this time are shown by reference numerals 4, 5, and 6 in FIG. When performing expansion printing with this film, a suitable setting value of the exposure amount of the expansion machine is found so that an optimum printing result can be obtained from any film. If the exposure time is constant, it means finding an appropriate aperture value for the expanding lens or finding the density value D of an optically neutral filter (called D filter). An example is shown by reference numerals 7, 8 and 9 in FIG. 1, though it depends on the sensitivity of the film. In this way, a combination of various shades of film sequence and an appropriate exposure amount can be obtained. This is called the gray scale for monochrome negative film. (See FIG. 1) 2) In case of color negative film Here, filters B, G and R correspond to the three primary colors of colors blue, green and red, and Y, M and C indicate yellow, magenta and cyan B and G, respectively. , R are complementary colors. D is a filter that is neutral in color and has different densities. This regulates the main and total exposure. A standard development process is performed after exposing one representative aperture (or one-half aperture) more and less sequentially with reference to the color negative film that has been photographed with standard exposure and subjected to standard development processing. Create a row of the film that you made. This method is similar to that of the monochrome negative film. When performing expansion printing with this film, an appropriate exposure amount of the expansion printing machine and a correction value of Y, M, and C filters for average color correction are obtained so that an optimum printing result can be obtained from any film. Reference numerals 10, 11, and 12 in FIG. 2 denote optimum print lines, 13, 14, and 1.
5 is a combination of the filter value and the exposure amount at that time, 16,
Reference numerals 17 and 18 show examples of correction values of the stretching printing machine. In this way, a combination of various shades of film sequence and an appropriate exposure amount can be obtained. This will be referred to as a gray scale for color negative film. 3) In the case of color positive film A film sequence having shades is created in the same manner as in the case of color negative film. Also. In making an optimum print, color correction is applied to the print using Y, M, C and D filters. A combination of a film train and a color correction filter that provides an optimum print is called a gray scale for a color positive film. (2) Method of creating color map Based on the optimum print (determined by paired comparison) obtained from a standard negative film of a typical subject, the filter value is stepwise from the reference value, for example, every 2.5 steps. Create a print group that has been increased or decreased and printed. The correction amount and the exposure amount are determined by using a stretching printing machine which has been subjected to the filter spectral characteristic and filter scale verification. A color map is created by classifying the printing paper created by printing in this manner into color components. (See FIG. 4) An example of the filter value at that time is shown in FIG. Next, a method of obtaining the correction amount from the color map will be described. When an optimal print obtained from a negative film of a typical subject is used as a reference, the correction amount of the reference print is 0. (Refer to the 0 value on the CR line and the 0 value on the D-D line in FIG. 5) Therefore, a negative sign or a complementary color is added to the filter correction value (see FIG. 5) when increasing and decreasing from the reference value in steps. The color-corrected value is the correction amount value for optimum printing. (See FIG. 6) A positive image group having a correction amount including the above-described stretch printing machine, printing paper, and correction of development processing characteristics is called a color map. It is used for certification of finished prints and trial printing. In addition, by finding a print corresponding to the sample of the stretched print (trial print paper) on this color map, the corresponding filter value (see Fig. 5) when intentionally biased light was created By obtaining a filter value (see FIG. 6) having a complementary color relationship with the unclear value, a combination of the filter correction value and the exposure amount that can obtain an appropriate print is obtained. When a print having the same color tone as the test-printed print having a color deviation is found on the color map, the filter value for obtaining the optimum print can be obtained from FIG. (3) Pre-judgment system A computer and a digitizer as one of the input devices are used to specify the position of the above scale on the digitizer, and a filter that can obtain the optimum baking result previously obtained corresponding to the position. The correction amount and the exposure amount are input and stored. By comparing and collating the film and the test print to be printed later, the position of the scale having the same shade or color tone is designated, and the filter correction amount and the exposure amount by which an appropriate burning result is obtained are read out. (See FIG. 7) Input designation items having various names such as a gray scale, a subject collection, a film type collection, etc. are arranged in a place called a timing board. (See Figure 8)

[0005]

The present invention is a method of comparing a film to be stretched and printed with a light and shade scale to find a scale having the same light and shade, or in the case of a color photograph, for example, a printed image having the same color tone as a burned test print with a color map is color mapped. By adopting the above-mentioned method, it is possible to determine the filter correction amount and the exposure amount without making an absolute value judgment based on personal memory for a color that is slightly changed by some people. This is equivalent to the zero method which is generally used in the measurement method, and has a characteristic that the filter correction amount and the exposure amount for stretching and printing can be correctly determined with relatively small individual differences.

[0006]

[Embodiment] Since the various quantities obtained as described above are quantified, they can be easily set on a stretching printing machine by direct human operation or through the communication function of a computer.
Alternatively, it can be saved in a computer as data and reused. The gray scale and color map obtained earlier are located on the digitizer by specifying their positions. Corresponding to these positions, the filter correction amount and exposure amount (the exposure amount (Including the D filter amount) is stored. The same applies to various correction items. (1) The first implementation method is to compare and collate the film to be stretched and printed and the gray scale of monochrome or color (see Fig. 1 and Fig. 2) on the digitizer to find out the scale of the same density. By specifying it, the filter correction amount and the exposure amount corresponding to it are obtained. (2) The second implementation method is applied when a color film, mainly a negative color film, is targeted, but it is still necessary to add color correction to the test print image.
For the work, the print image and color map (4th
(See the figure), a positive image showing the same color tone is found on the scale and the position is designated by the digitizer to obtain the corresponding filter correction amount and exposure amount.
(Refer to Fig. 6) In the case of professional labs, the customers who deal with amateur labs often have a strong preference for the finished color tone, and there are limit lines on the color map or for specific customers. A special color map is created to meet various needs. (3) The configuration and the like will be described below in the order of FIG. 7, FIG. FIG. 7 shows a configuration example of a device called a pre-judge system. A digitizer is a type of computer input device that detects and specifies the position on the board using electromagnetic coils or other principles. Data is stored in the computer in advance corresponding to the position, or the data is simply stored. Used for reading. FIG. 8 shows a portion called a timing board, which uses a digitizer to select the above-described position designation and other data and input the data to a computer. As an example, reference numeral 23 is a light and shade scale, 24 is a film type data, 25 is a variable collection data,
Reference numeral 26 is subject correction data, 27 is a color map, 28 is a magnification measuring scale for easily measuring the film size, 29 is a function key for designating various operating functions of the central processing unit, and the like. As a result of the comparison and collation, a digitizer position detection sensor (mouse or the like) is placed at a predetermined portion to specify the position by operating a switch, thereby simplifying the input / output operation of a predetermined value.

[0007]

According to this method, variations in quality can be prevented because the amount of filter correction and the amount of exposure for stretching and printing can be correctly determined with a relatively small individual difference.
In addition, digitizing the filter correction amount and exposure amount made it possible to simplify the work and rationalize the work by the computer.

[Brief description of drawings]

FIG. 1 shows a gray scale of a monochrome negative film and a gray scale of a color positive film and exposure data.

FIG. 2 shows a gray scale and exposure data of a color negative film.

[Figure 3] Variable collection screen

[Figure 4] Color map printing

[Figure 5] Exposure data for creating a color map print

[FIG. 6] Correction data for printing an image from a color map

[Fig. 7] Configuration diagram of the pre-judge system

[Figure 8] Timing board

[Explanation of symbols]

1 to 3 developed dark and light film sequence 4 to 6 exposure data for creating dark and light film 7 to 9 exposure data for obtaining optimal print 10 to 12 optimal print sequence 13 to 15 optimal print exposure data (quality setting data) 16 to 18 optimal Setting value of enlargement printing machine for printing 19 Central processing unit of pre-judging system 20 Timing board 21 Position sensor 22 Enlargement printing machine 23 Placement of various shades 24 Place to specify film type data 25 Place to specify variable collection 26 Place to specify subject collection 27 Place to specify color map 28 Place to specify magnification measurement scale 29 Place to specify function key

Claims (4)

[Claims] 1. A method of creating a gray scale of color and monochrome negative film. A monochrome negative film or a color negative film (see reference numeral 2 in FIG. 1) which has been standardly exposed and photographed by a standard exposure of a typical subject is used. As a reference, a sequence of films is prepared which is sequentially exposed one aperture (or one half aperture) more and less and then subjected to standard development processing.
Reference numerals 1, 2, and 3 in FIG. 1 denote film trains, and 4, 5, and 6 denote the exposure time (second) and aperture value at that time. When performing expansion printing with this film, a suitable setting value of the exposure amount of the expansion machine is found so that an optimum printing result can be obtained from any film. The value depends on the characteristics such as the sensitivity of the printing paper to be used, but it is determined by considering the empirical value. Examples are shown by reference numerals 7, 8 and 9 in FIG. If the exposure time is constant, it means finding an appropriate aperture value for the expanding lens or finding the density value D of an optically neutral filter (called ND filter). In this way, a combination of film rows corresponding to various shades and an appropriate exposure amount is obtained. The above is prepared separately for color and monochrome negative films. 2. A method for producing a gray scale of a positive color. A typical subject is exposed to a standard exposure and photographed, and then a standard development processing is applied to the positive color film. An array of standard processed films is prepared after more and less exposure. When performing expansion printing with this film, a suitable setting value of the exposure amount of the expansion machine is found so that an optimum printing result can be obtained from any film. If the exposure time is constant, it means finding an appropriate aperture value for the expanding lens or finding the density value D of an optically neutral filter (called ND filter).
In this way, a combination of film rows corresponding to various shades and an appropriate exposure amount is obtained. The procedure is the same as for the monochrome negative film. 3. A method of creating a color map. An optimum print (print) obtained from a negative film is created on the basis of a negative film obtained by subjecting a typical subject to standard exposure, photographing, and standard development processing. Find the Y, M, C (R, G, B) filter correction amount and exposure amount of the stretch printing machine. The optimum print, that is, the Y, M, C (R, G, B) filter correction amount and the exposure amount, which are the prints at the center of FIG. 4, are used as the reference values (0 value and D-
Filters Y, M, C, D (R, G,
B, D) and a combination thereof are used to expose the photographic paper with light that is intentionally biased to create a photographic line (see FIG. 4). It is assumed that each filter is increased or decreased stepwise from the reference value in the characteristic direction of each color, for example, every 2.5 steps. (See FIG. 5) The numerical value of this step corresponds to the value of the color correction (CC) filter on the filter scale of the enlarger. The positive image group thus created on the photographic paper includes conditions such as the characteristics of the enlarger, the characteristics of the photographic paper, and the development processing characteristics of the photographic paper, and is called a color map. By finding a print corresponding to the sample of the stretched print (trial printing paper) on this color map, the corresponding filter value (see Fig. 5) when intentionally biased light was created can be found. By obtaining a filter value (see FIG. 6) having a complementary color relationship with that value, a combination of the filter correction value and the exposure amount that can obtain an appropriate print is obtained. 4. A method for finding a proper filter correction value and exposure value by using a digitizer as one of input devices of a pre-judgment system computer and designating the scale on the digitizer. Specify the position of each of the monochrome negative film, gray scale of positive color film, and color map screen on the digitizer,
The filter correction amount and the exposure amount that can obtain the optimum burning result previously obtained corresponding to the position are input and stored. Later, the stretched film is a light and shade scale on the digitizer, and the created test print is compared and compared with the color map to specify the position of the scale with the same light and shade and color tone. , The exposure amount is read from the output device of the computer.