JPS61138943A - Film inspection - Google Patents

Abstract

PURPOSE:To make possible the printing of an adequately inspected film original picture always at the correct color balance and density by determining preliminarily the corresponding relation between the image displayed on an inspection device and the printed image to be actually printed. CONSTITUTION:The standard film original picture 20 and a gray step 21 having the gradation of prescribed density differences and having the same mask density as the density of the picture 20 are adjacently disposed to a printer and a standard photograph is formed by printing. The gray step 21 is then set to the film inspection device and is displayed on the display device of the film inspection device. A gradation conversion data table is formed from the displayed gray step data and the gray step data of the standard photograph. The data table is then set as the gradation table of the film inspection device and the inspection of the film original picture to be printed is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a film original inspection method for evaluating film originals prior to photographic printing, and particularly to a method for initializing tone tables.

(Technical background of the invention and its problems) The conventional film inspection method is carried out as shown in FIG. In other words, is the original film 1 to be printed, for example negative film 1, the light source? The healthy body is imaged by a TV camera 3 as an imaging device and inputted to an image processing circuit 4. The image processing circuit 4 includes a color correction circuit, a gradation conversion table, and a negative/positive conversion circuit. The image processing circuit 4 performs necessary processing on the video signal from the TV camera 3 and passes it through the control circuit 5 to the CR.
The image of the negative film l is displayed on a display device 6 such as T. The monitor man looks at the displayed image on the display device 6, and if the color balance or density is unsatisfactory, he adjusts the displayed image to an appropriate one by operating the keyboard 7.
The image processing data at that time is outputted from the data output device g18 on a magnetic tape, floppy disk, or the like. The negative film l that has been verified and corrected to a proper display image is outputted from the data output device Wi8, for example, on a recording medium 11 such as paper tape or magnetic tape.
It is also sent to the printer IO, where it is blit by this splitter 10 to obtain a photograph 12.

With such conventional testing methods, is it possible to test negative film 1? The monitor man performs the process based on the display image displayed on c2t6, but the actual photographic image is the photograph 12 printed by the printer 10. For this reason, the relationship between the display image on the display device 6 of the verification device and the actual photo 12 printed by the printer IO is ignored, and even if the image is properly displayed on the display device 6, , there is a drawback that the photos 31) 12 printed by the printer 10 are not always appropriate.

(Object of the invention) This invention was made under the above circumstances,
An object of the present invention is to obtain in advance the correspondence between the display image of the verification device and the print image that is actually printed.
The objective is to provide a film verification method that allows properly verified film originals to always be printed with proper color balance and density.

(Summary of the Invention) The present invention relates to a method for displaying and verifying a film original to be printed on a display device of a film verification device, which has a gradation with a predetermined density difference and is identical to the film original. A standard photograph is obtained by printing a gray step having a mask density together with an original standard film so that the image is appropriate, and the gray step is loaded into the film verification device and displayed on the display device. The displayed gray step data and the above e! Obtain a gradation conversion data table from the gray step data of the quasi-photo,
This data table is set as the gradation table of the film inspection device.

(Embodiments of the Invention) The verification method of the present invention will be explained with reference to the flowchart of FIG.

In this invention, a negative film 20 as a standard film original as shown in FIG.
and a gray step 21 having the same mask density are placed adjacent to each other at a predetermined print position of the printer, and printing is performed with the negative film 20 and gray step 21 adjacent to each other as shown in FIG. In this case, a predetermined gray step may be photographed on the negative film 20 itself, and in this case, the negative film 20 is as shown in FIG. 3, and this negative is printed by a printer. , a standard photograph 22 is obtained in which the image and the gray steps are adjacent to each other as shown in FIG. repeats printing so that the image becomes a proper photo print, and finally obtains a standard photo 22 printed in the most desirable state (steps S2 and S3). Such a standard photo 2
2 is printed and obtained, the gray step 21 used for the above print (or the negative if it is integrated with the negative)
is set in the film testing device as described above (step S4), this gray step 21 is displayed on the display device 6 of the film testing device (step S5), and at the same time, the density of the gray step of the standard photograph 22 is measured. S9), Gray Step 21 loaded in the verification device
Set the gradation table so that the density is the same as the gray step density of the print after gradation conversion (step S
8) As a result, the gray step of 1 display bag 2 B, h will look the same as the gray step on the print. In other words, the step of gray step 2I is 1
5rf4, and the step when this is best printed as the standard photograph 22 is P(n) shown in FIG. Since is P(n)pa(n), fl becomes as shown in Figure 7, and by interpolating this, the gradation table S
Can you get T and test this? The gradation table is initially set as a C-position gradation table.

Here, depending on the environment in which the verification device is installed (for example, the surrounding brightness and the preference of the operator), the gray steps on the display device 6 may not necessarily look the same as the gray steps on the print. , more e! Compare it with the gray step image 22A printed on the semi-photo 22, and set the image processing circuit 4 in the film verification device so that the gray tape 7 image on the display device 6 is the same as the gray step image 22A on the standard photograph 22. By adding gamma correction, offset correction, etc. to the gradation table, so that the gray steps on the display device 6 look the same as the gray steps on the print,
2g1ffi the table with the keyboard 7 and set the gradation table with this adjusted data to complete the preprocessing of the film verification device (steps S7 and S8)
.

Figure 11g8 shows the state of γ correction and offset correction.If the initially set gradation table is 5 tones, and if one gradation is to be hard, it is corrected like STI, and the gradation is made softer. If it is, correct it as shown in S↑2. Further, offset correction is performed by softening the tone table ST in the vertical direction.

After the pre-processing of the film verification device is completed, the original film to be printed is verified using the method shown in FIG. The gradation conversion table of the display device 6 and the actual printer lO
Since the density relationship is set to be the same as that of photograph 12 obtained in
If the printer 10 prints using the data adjusted to make the image a proper image, a proper photograph 12 will be obtained.

(Effects of the Invention) As described above, according to the method of the invention, since the correspondence between the film verification device and the photo printer is determined and set in advance, the film original verified by the film verification device can be properly processed by the printer. It is possible to print it as an image.

[Brief explanation of the drawing]

The first is a flowchart showing the method of this invention. 2(A), (8) to tJIJ4 are diagrams for explaining the method of this invention, FIGS. 5 to 7 are diagrams for explaining the setting of the gradation table in this invention, and FIG. 9 is a diagram showing how the gradation table is corrected according to the present invention, and FIG. 9 is a diagram for explaining film inspection work. I...Negative film, 2...Light source, 3...TV right camera 4...Image processing circuit, 5...Display control circuit. 6...Display attachment, 7...Keyboard, 8...Data output device, lO...Printer, 20...Negative film, 21...Gray step. Applicant's representative Yu Yasugata 1st T, 7) Cha 5th 2. . 6th section F (
fL) Chafu diagram $ 6 diagram

Claims (2)

[Claims] (1) In a method for verifying a film original to be printed by displaying it on a display device of a film verification device, a gray step consisting of gradations with a predetermined density difference and having the same mask density as the film original is displayed on a standard film. The image is printed together with the original image to obtain a standard photograph, and the gray step is loaded into the film verification device and displayed on the display device, and the displayed gray step data and the standard photograph are displayed. A gradation conversion data table is obtained from gray step data, and this data table is set as a gradation table of the film inspection device. (2) The film inspection method according to claim 1, wherein the gradation table is obtained after the gradation conversion data table is subjected to γ correction and offset correction.