JPS5827491B2 - Color printing separation plate proof reproduction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a proof printing apparatus for color printing separations for electrically combining images separated into several color printing separations and reproducing them as proofs on a color television monitor. This is related to the improvement of

Generally, when printing an original image with tones, magenta, cyan,
Separated versions of four color elements, yellow and black, are created and used to perform color printing.

Therefore, the quality of the separation plate is an important factor in determining the quality of color printing.

For this reason, conventionally, a plurality of separation plates of the same type of color elements are produced, and the one with the highest quality is selected and used.

Conventionally, a proof reproduction device for color printing separations, as shown in the block diagram of Figure 1, has been used to select and extract separations of the best quality from a plurality of separations of the same type of color elements. There is.

This device extracts one arbitrary separated version from each of the separated versions of four types of color elements, and displays images of the extracted separated versions IY, IC, IM, and IBL of the four types of color elements on a television camera. 2 converts it into an electric signal, and recording/reproducing devices 3Y and 3C are provided corresponding to each color element.

Recording command switches 5Y and 5C for 3M and 3BL.

5M and 5BL are closed, recording is performed only during the period of the recording command pulse signal sent from the recording command gate 4,
After the playback outputs of these recording and reproducing devices are approximated to the proof print by the correction circuit 6, they are converted into video signals R, B, and G and sent to the color television monitor 7, and the composite image of the separated plates is used as the proof print. It is intended to be reproduced as an alternative image.

Therefore, the quality of the separation plate is determined by observing a substitute image of the proof print reproduced on the color television monitor 7.

However, the problem with the conventional color printing separation plate proof reproduction device (hereinafter referred to as the reproduction device) that has such a function is that it is difficult to reproduce the four types of separation plates arbitrarily selected by the observer. The problem is that it becomes difficult to determine if there is a quality defect in any of them.

In other words, in the conventional reproduction device as shown in Fig. 1,
Only one image of each of the four disassembled versions can be recorded.

In other words, multiple images are created for each color element, and it is not possible to record all the separated versions.

Therefore, if there is a quality defect in one of the four disassembled images that the observer arbitrarily extracted at the beginning, the observer temporarily remembers this first substitute image and The image of one of the separation plates is erased, the image of the second separation plate is recorded and played back, and the substitute image of the color-corrected proof is visually compared with the first substitute image.

By the way, human vision is generally able to easily distinguish minute changes in a specific image when it is continuously observed, but it is difficult to distinguish between a specific object and the changed image. It is difficult to easily distinguish minute changes when viewing other images or when a certain amount of time passes.

For this reason, in conventional reproduction apparatuses, it is extremely difficult to select and extract which decomposed version to ultimately select.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a proof printing reproduction apparatus for color printing separation plates that can easily determine whether the separation plates are good or bad.

In order to achieve this purpose, the color printing separation plate proof printing reproduction apparatus according to the present invention is one of the color televisions.
A division gate circuit is provided that generates a time division pulse to divide the field time into arbitrary plurality of time periods with an arbitrary time width, and the division gate is sent to a recording/playback device provided corresponding to each color element. Using the time-division pulses from the circuit, one-plane images of the number of separated plates of each color element N (N≧2) according to the number of time-divisions are recorded in a time-division manner, and the number of time-divisions and the time-division pulses are recorded. A plurality of composite images are reproduced on the same screen of a color television monitor according to their respective time widths.

Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 2 is a block diagram showing an embodiment of the reproducing apparatus according to the present invention, and the same parts as in FIG. 1 are denoted by the same symbols.

In the figure, the differences from the block diagram shown in Figure 1 are as follows:
A dividing gate circuit 8, a dividing gate regulator 9, and a dividing gate switch 10 are newly provided to generate a time division pulse for dividing one field of a color television monitor into two time periods with an arbitrary time width. The point is that

The division gate)/adjuster 9 determines the pulse width tw of the time division pulse generated from the division gate circuit 8 shown in FIG. The proportion of the two composite images displayed on the screen changes.

When the division gate switch 10 is closed, the division gate circuit generates a time division pulse for dividing one frame of recording command pulse (FIG. 3a) generated from the recording command gate 4 into two time periods. 8.

Figure 3 shows time-division pulses.

The operation of the reproducing apparatus configured as described above is as follows.

First, the division gate switch 10 is opened, and the television camera 2 sequentially converts the images of the four types of decomposed versions into electrical signals in the same way as before without generating time-division pulses. , 3M.

Record on 3BL.

Then, the playback signals of these recording/playback devices are supplied to a correction circuit 6, and after adding additions that approximate the proof, they are converted into video signals R, G, and B, which are supplied to a color television monitor 7, and the proof observed as an alternative image.

Next, the division gate switch 10 is closed, and the division gate circuit 8 transmits the time-division pulses as shown in FIG. While observing the image at this time, the division gate adjuster 9 is adjusted to determine from which position the composite image of the second separated version is to be projected.

Next, the image of the second separated plate 1Y2 of the yellow color element, for example, is converted into an electrical signal by the television camera 2, and the recording command switch 5Y is closed.

At this time, since the time division pulse is also supplied to the recording command gate 4 by the division gate circuit 8, the recording command pulse given from the recording command gate 4 to the recording/playback device 3Y is ANDed with the time division pulse. It becomes a pulse.

That is, the recording command pulse is time-divided and supplied to the recording/reproducing device 3Y.

Recording/playback device 3Y, 3C. 3M and 3BL have a recording function only during the recording command pulse signal period, and have a constant playback function during other periods.

Therefore, the time-divided recording command pulse is transmitted to the recording/playback device 3Y.
, the image of the second separated version 1Y2 is recorded only during the period when the time-division pulse shown in FIG. 3 is at the H" level.

In other words, the image of the first separated version 1Y is erased only during the "H" level period of the time-division pulse, and the image of the second separated version 1Y2 at that position is recorded.

Therefore, as shown in Figure 4, the composite image of these four types of decomposed plates is a composite image of decomposed plate 1Y2 and the other three decomposed plates, and the bottom part is the first decomposed plate 1Y. This is a composite image of this and three other decomposed versions.

The proportion of the upper composite image and the lower composite image on the screen can be arbitrarily changed by changing the division gate adjuster 9 and changing the pulse width tw of the time division pulse, as described above. I can do it.

Therefore, since two composite images are displayed on the same screen at the same time, it is possible to easily determine the quality of the separated version in a short time.

In this embodiment, the number of time divisions of the l field is 2.
However, it goes without saying that the number of time divisions can be set to any number by providing a plurality of division gate switches.

In addition to dividing the screen vertically, the dividing gate circuit 8 in this embodiment can divide the screen horizontally, generate a gate signal with a rectangular area that is a combination of the upper, lower, left and right gates, and generate a gate signal corresponding to the area of a predetermined arbitrary figure. It goes without saying that this is done in the prior art and is included in the divided gate signal of the present application.

As explained above, according to the reproducing apparatus according to the present invention, it is possible to very easily judge whether the color printing separation plate is good or bad, and the judgment accuracy can be further improved compared to the conventional method. It has extremely excellent effects, such as being able to prevent deterioration in printing quality due to plate defects.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of a conventional color printing separation plate proof reproduction apparatus, and FIG. 2 is a block diagram showing an embodiment of the configuration of a color printing separation plate proof reproduction apparatus according to the present invention. Fig. 3 is a time chart showing the relationship between the recording command pulse and the time-division pulse for one field, and Fig. 4 is a diagram showing a composite image produced by the color printing separation plate proof reproduction device shown in the block diagram of Fig. 2. . IY, IC, IM, IBL, IM2...disassembled version, 2-...television camera, 3Y, 3C, 3
M. 3BL... Recording/playback device, 4... Recording command gate, 5Y, 5C, 5M, 5BL... Recording command switch, 6... Correction circuit, 7・・・・・・
・Color television monitor, 8... Division gate circuit, 9... Division gate adjuster, 10...
...Split gate switch.

Claims (1)

[Claims] 1 Record the electric signals obtained by capturing each image separated into color printing separation plates corresponding to a plurality of color elements into a recording/playback device installed corresponding to each color element, and record these playback signals. In a proof print reproduction device for color printed separated plates that is electrically synthesized and reproduced as a proof print on a color television monitor, one field period of color television can be divided into any plurality of time periods in any time width. The recording/reproducing device is provided with a division gate circuit that generates a time division pulse for division, and the time division pulse of the division gate circuit is selectively applied to each of the recording/reproducing devices, so that N images (N22) can be generated for each of the color elements. Recording for time-divisionally recording electric signals of corresponding image portions of each of the color printing separation plates, the number of which corresponds to the number of time divisions of the selectively applied time-division pulses, among the color printing separation plates produced. A composite image is created using time-division playback signals for each color element selectively recorded in each recording/playback device according to the number of time-divisions in one field period and the time period of each time-division pulse. A proof printing reproduction device for color printing separation plates, characterized in that the proof printing is reproduced on the same screen of a color television monitor.