JP2924360B2 - Color image proofing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention
The present invention relates to a color image proofing apparatus that obtains a color proofing image by printing a halftone dot image on a photosensitive material.

[0002]

2. Description of the Related Art Recently, in color proofing in a printing process,
The image data of yellow (Y), magenta (M), cyan (C), and black (K) obtained by color separation of a color original is converted into halftone signals, and red ( R), green (G) and blue (B) light beams ON / OF
A color image proofreading apparatus that performs F modulation and directly reproduces a halftone image on a photosensitive material such as a silver halide color photosensitive material has been used. According to such a color image proofing apparatus, the finished state of printing can be immediately confirmed with the developed photosensitive material, so that color proofing can be performed more easily than when a proof plate is prepared.

[0003]

However, the conventional color image proofing apparatus has the following problems. Each of the R, G, and B light beams that expose the photosensitive material is typically modulated by providing an acousto-optic modulator (AOM) with a corresponding dot signal. This halftone signal is ON / O
Since the information is binary information of the FF, the voltage applied to the AOM is also binary, for example, 5V when ON and 0V when OFF. Since the amount of light transmitted by the light beam through the AOM depends on the voltage applied to the AOM, the amount of light transmitted through the AOM necessarily becomes a binary light amount according to ON / OFF. Therefore, the color density of the photosensitive material determined by the irradiation light amount is also fixed in accordance with ON / OFF of the halftone signal.

On the other hand, since the ink and paper quality actually used in the printing process are various, the finish of printed matter differs depending on the ink and paper quality used. Despite these circumstances, conventional color image proofing devices fix the color density based on the average ink and paper quality. In some cases, a density difference may occur from the actual printed matter.

In view of this, it is conceivable to make the area of the halftone dots formed on the photosensitive material different from that of the actual printed matter so that no density difference occurs between the proof output and the printed matter. When compared with a printed matter of the same density, a different problem arises that a different impression is given to a viewer due to a difference in halftone dot area.

Since the main purpose of the proof output is to faithfully reflect the printing result, it is inconvenient for an image proofing apparatus that the density and the halftone dot area are different from those of the actual printed matter. Further, according to the conventional apparatus, the blank portion (the paper portion on which ink does not adhere) is AO if the photosensitive material is a negative photosensitive material.
By setting M to a completely OFF state or, in the case of a positive photosensitive material, AOM to a completely ON state, the photosensitive material is unexposed (or exposed) uniquely.
In other words, it is not possible to adjust the density of the missing part of the proof output, so it often differs from the actual print quality.
This has also been a major factor in giving the impression that the proof output differs from the actual printed matter. In addition, regarding the special color printing, since the conventional apparatus fixes the color density of the photosensitive material, the special color cannot be reproduced in a plain screen state, and therefore, the calibration of the special color printing cannot be performed by the conventional apparatus. Was.

The present invention has been made in view of such circumstances, and provides a color image proofreading apparatus capable of obtaining a color proofreading image suitable for the conditions (density) of a printed material such as ink used and paper quality. It is intended to be.

[0008]

The present invention has the following configuration in order to achieve the above object. That is, the invention according to claim 1, directly from the color image data of a document, the color image calibrating device for obtaining a color calibration image by baking a halftone image on a color photosensitive material, sound
ON voltage value and OFF voltage value applied to the sound optical modulator
To adjust the acousto-optic modulator ON state and
And controlling the transmitted light amount of the printing light beam in the OFF state, and printing the halftone image on the color photosensitive material with the light beam whose transmitted light amount is controlled, whereby the color photosensitive material develops a desired color. as controls the color density of each dot on the color photosensitive material. Claim 2
The color image proofing device according to claim 1
, The ON voltage value and OF of the acousto-optic modulator
The F voltage value is set in advance according to the printing conditions . The invention according to claim 3 provides the power according to claim 1.
The acousto-optic modulator is turned on.
One of the voltage value and the OFF voltage value is
Adjusted based on the color image data of the original,
The pressure value is set in advance according to the printing conditions . According to a fourth aspect of the present invention, there is provided a collar according to the first aspect.
In the image calibration device, for the acousto-optic modulator,
ON voltage value set in advance according to printing conditions and
First voltage value adjusting means for applying an OFF voltage value;
The acousto-optic modulator is based on the original color image data.
Of the ON voltage value and the OFF voltage value
A second voltage value adjustment for giving at least one of the voltage values
Adjustment means and position determination for determining a plurality of types of areas in a document
Means and an area determined by the position determining means.
The first voltage value adjusting means and the second voltage value adjusting means
Control means is selectively switched so that either one of the voltages
The voltage value from the value adjusting means is applied to the acousto-optic modulator.
Switching means . Claim 5
The invention provides a color image according to any one of claims 1 to 4.
In the image calibration apparatus, an ON voltage value of the acousto-optic modulator
Either the OFF voltage value or the OFF voltage value is
Is set in accordance with the density of the missing portion of.

[0009]

The operation of the first aspect of the invention is as follows. That is, the ON state and OFF of the acousto-optic modulator
It voltage applied to the acousto-optic modulator in a state
Then, the transmitted light amount of the printing light beam when the acousto-optic modulator is in the ON state and the OFF state is controlled.
The amount of light beam transmitted when printing a halftone dot image (for example,
For example, if the color photosensitive material is a negative type,
The amount of transmitted light when the
The transmitted light when the acousto-optic modulator is in the OFF state.
By changing the amount, the density (coloring density) of the halftone dots formed on the color photosensitive material can be changed even if the halftone dots have the same size. Non-images other than halftone images
The amount of light beam transmitted when printing the image area (for example,
For example, if the color photosensitive material is a negative type,
Light intensity when the optical modulator is OFF
In some cases, the transmitted light when the acousto-optic modulator is ON
Volume, the density of non-image areas can also be changed.
Can be. By controlling the amount of transmitted light for each light beam of each color for printing as described above, and controlling the color density of each halftone dot on the color photosensitive material so that the photosensitive material develops a desired color, the printing conditions can be adjusted. An adapted color proofing image is obtained. According to the invention described in claim 2, in the printing process,
Depending on the printing conditions such as the ink and paper quality used,
ON voltage value and OFF voltage value of optical lift modulator are preset
Is done. For example, if the color photosensitive material is a negative type
When printing, the halftone image printed on the photosensitive material is printed.
The ink used in the printing process to obtain the same density as the product
ON voltage of the acousto-optic modulator (positive
If it is a type, the OFF voltage value is set in advance.
In both cases, the non-image area printed on the photosensitive material
Paper quality used in the printing process so that it is equivalent to printed matter
The OFF voltage value of the acousto-optic modulator (positor
In the case of the type, the ON voltage value) is preset. According to the third aspect of the present invention, the ON voltage of the acousto-optic modulator
Voltage value or OFF voltage value (for example,
For example, if the color photosensitive material is a negative type, the ON voltage
Value or OFF voltage value for positive type)
By adjusting based on the color image data, halftone
The transmitted light amount of the light beam at the time of image printing is controlled. this
Is applied to the acousto-optic modulator according to the density value of the original.
Voltage can be adjusted without changing the size of the dot.
The density of the original on a color photosensitive material (color proofing image)
It is possible to perform density expression according to the value. Also, non
When printing an image area, the other voltage value (for example,
For example, if the color photosensitive material is a negative type,
Pressure value and ON voltage value for positive type)
Set in advance according to the printing conditions such as paper quality used in the process.
To obtain a proof output equivalent to the actual printed matter.
Can be According to the invention described in claim 4, a halftone dot
The area to control the color density of the image according to the printing conditions
The voltage value adjusted by the first voltage value adjusting means.
Is applied to the acousto-optic modulator, and the color density of halftone dots is
When printing an area to be controlled according to the density value of the manuscript
Represents the voltage value adjusted by the second voltage value adjusting means
Applied to the dynamic modulator. As a result, the color density of halftone dots can be marked.
The area to be controlled according to printing conditions and the color density of halftone
Color of an original document that contains a region to be controlled according to the
-An image for calibration is obtained. According to the invention of claim 5
If, when printing a missing portion to the color light-sensitive material (paper quality portion which does not deposit ink), the voltage value corresponding to the missing portions, i.e., the color density to become such a voltage value corresponding to the paper quality for printing (e.g., color Negative photosensitive material
If it is a positive type, the OFF voltage value, if it is a positive type,
ON voltage value) is applied to the acousto-optic modulator. Thereby, the missing portion in the document can be reproduced on the color proofing image in conformity with the paper quality at the time of printing.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Before describing a specific embodiment of the apparatus, the principle of the apparatus of the present invention will be described with reference to FIG. FIG.
It shows the relationship among the voltage applied to the OM, the transmittance of the AOM, the amount of light transmitted through the AOM, and the color density of the photosensitive material. In particular, the amount of transmitted light and the color density are known as the γ characteristics of the photosensitive material. Things.

As is apparent from FIG. 1, since the amount of transmitted R, G, and B light passing through the AOM is determined by the voltage applied to the AOM, by appropriately setting the ON voltage and the OFF voltage of the AOM, The density inside and outside the point can be controlled. For example, when it is desired to set the density of a blank portion on a photosensitive material to D ₁ and the solid density (density of a region having a halftone dot area of 100%) to D ₂ , the ON voltage applied to the AOM is set to V ₁ , and the applied OF is applied.
The F voltage may do it set to V _2. If the characteristic diagram as shown in FIG. 1 is created for each of the colors Y, M, and C, the relationship between the AOM applied voltage and each of the color densities of the photosensitive material can be understood, and the R, G, and B colors can be reproduced to reproduce a desired color. Can be known to be set to each AOM corresponding to. In order to change the color density of the photosensitive material in accordance with the voltage applied to the AOM, it is preferable to use a photosensitive material having a gentle γ characteristic.

<First Embodiment Apparatus> A schematic configuration of the first embodiment apparatus will be described below with reference to FIG. This device is
This is an apparatus capable of controlling halftone dot density and blank density in a normal halftone dot image (picture). Y, obtained by reading an original with a color scanner (not shown),
Each of the M, C, and K image data is converted into halftone signals D _Y , D _M , D _C , and D _k by the dot generator 1 and then _supplied to the signal synthesis circuit 2.

The signal synthesizing circuit 2 has the following functions. That is, the color photosensitive material F is composed of B, G, R
Exposure with light of each of the three wavelength components has the property that the complementary colors Y, M, and C are colored. The portion where all three colors of Y, M, and C are colored becomes black. appear. On the other hand, the dot signals D _Y , D _M , D _C , D
_{Since k} is composed of four colors of Y, M, C, and K,
In order to directly record a color image on the color photosensitive material F based on these, it is necessary to combine black (K) halftone dots with three color dots of Y, M, and C. The signal synthesizing circuit 2 is provided for such a purpose, and each of the halftone signals D _Y , D _M , and D of the _Y , _M , and _C versions is replaced with a halftone signal D _k of the K version. It is composed of a logic circuit for synthesizing. A specific configuration of the signal synthesizing circuit 2 is described in, for example,
No. 192.

The combined halftone signal S obtained by the signal combining circuit 2
_DY, S _DM, S _DC is applied respectively to the applied voltage generation unit _{3 Y, 3 M, 3 C} . Applied voltage generator _3Y , _3M , _3C
Is for converting the combined halftone signals S _DY , S _DM , and S _DC , which are ON / OFF binarized signals, into voltage values corresponding to the conditions of the printed matter. The applied voltage generators _3Y , _3M ,
3 _C has the same structure, respectively. Hereinafter, examples of these configurations are shown in FIGS.

The applied voltage generator 3 shown in FIG.
Includes a switch 3a that is switched by the ON / OFF of the composite halftone dot signal S _D, while synthetic halftone dot signal S _D to the terminal T ₁ of the switch 3a is set voltages applied at the time of ON, the other terminal T _{In 2} , an applied voltage when the composite halftone dot signal _SD is OFF is set. Each applied voltage can be appropriately adjusted by an operator with variable resistors VR1 and VR2 according to printing conditions.

The applied voltage generator 3 shown in FIG.
Is the terminal group T _1, T _2, ..., the voltage value V ₁ which is different each T _n, V _2, ..., a multiplexer 3 V _n is set
b and a controller 3c for controlling the same. The controller 3c, based on a setting signal from an operation panel (not shown) operated by an operator, controls the terminal group T ₁ ,
The multiplexer 3b is controlled so that two terminals suitable for printing conditions are selected from T ₂ ,..., T _n in accordance with ON / OFF of the composite halftone dot signal _SD .

The applied voltage generator 3 shown in FIG.
Converts ON / OFF of the composite halftone signal _SD based on two types of digital data adapted to printing conditions based on an external setting signal.
It includes a controller 3d that outputs in response to OFF, and a D / A converter 3e that converts digital data output from the controller 3d into an analog signal. The controller 3d is composed of, for example, a CPU, and is set in advance so that digital data adapted to printing conditions is output according to ON / OFF of the composite halftone signal _SD .

Returning to FIG. 2, the applied voltage generators 3 _Y ,
3 _M, each applied voltage value outputted from the 3 _C through AOM driver 4 _Y, 4 _M, 4 _C, respectively, AOM5 _Y,
It is given to the 5 _M, 5 _C. B, G, and R laser light sources 6
_B, the respective light beams output from the 6 _G, 6 _R, are ON / OFF modulated by AOM5 _Y, 5 _M, 5 _C corresponding to each. At this time, since the ON voltage and the OFF voltage according to the printing conditions are applied to the AOMs 5 _Y , 5 _M , and 5 _C , the amount of transmitted light is adjusted accordingly. The B, G, and R light beams are not limited to those obtained from individual light sources as described above, and may be obtained by dispersing a white light beam from a single white light source.

The light beam LB _B transmitted through the AOM 5 _Y is reflected by the total reflection mirror 7 to the light beam LB _G transmitted through the AOM 5 _M.
Is a dichroic mirror 8, and the light beam LB _R transmitted through the AOM 5 _C is reflected by the dichroic mirror 9 on the same optical axis, and irradiates the photosensitive material F mounted on the rotating cylinder 11 via the imaging lens 10. Is done.

As described above, according to the present embodiment,
B, G, modulating each light beam R AOM5 _Y, 5 _M,
The applied voltage at ON and the applied voltage at OFF according to the printing conditions are added to 5 _C to control the amount of transmitted light, so that it is not necessary to change the halftone dot area to reproduce the same density as the printed matter. In addition, the amount of transmitted light at the time of OFF in the case of a negative photosensitive material for a blank portion, and O in the case of a positive photosensitive material.
By appropriately setting the amount of transmitted light at the time of N, it is possible to reproduce a drop density equivalent to the paper quality of the printed matter.
Color proofing with high fidelity can be performed.

<Second Embodiment> The present embodiment is a color image proofing apparatus suitable for color proofing of special color printing. In the following, reference is made to FIG. Each of the Y, M, C, and K image data obtained from a color scanner or the like is converted into a density signal by a density conversion circuit 21. The density signals Y ₁ , M ₁ ,
C ₁ is added to the density signal K ₁ by adders 22 _Y , 22 _M , and 22 _C , respectively. The density signals Y ₂ , M ₂ , and C ₂ obtained by masking with the density signal K ₁ are converted into voltage signals by the density-voltage conversion circuit 23. The voltage signals Y ₃ , M ₃ , and C ₃ are provided to the spot color control circuit 24 and are converted into voltage values corresponding to the respective spot colors. The spot color control circuit 24 is constituted by, for example, a CPU, and is preset so as to convert the voltage signals Y ₃ , M ₃ , and C ₃ output from the density-voltage conversion circuit 23 into voltage values suitable for the spot color density. I have.

If each of the Y, M, C, and K image data provided from a color scanner or the like is already spot color data, the spot color control circuit 24 may be omitted. However, if the spot color cannot be faithfully reproduced depending on the image data of the given spot color, for example, when the spot color of the image sample and the spot color expressed by the proofreading device are slightly different, the above-described spot color control circuit 24 is used. Then, by finely adjusting the respective density ratios of Y, M, and C, it is possible to approximate the characteristic color of the image sample.

The special color voltage signals Y ₄ , M ₄ and C ₄ output from the special color control circuit 24 are changed over by a changeover switch 25.
_Y , 25 _M and 25 _C are provided to one input terminal. The other input terminals of the changeover switches 25 _Y , 25 _M , and 25 _C are connected to the blank density setting devices 26 _Y , 26 _M , and 2.
The Y, M, and C concentration voltage values of the missing portion preset in 6 _C are given.

Each changeover switch 25 _Y , 25 _M , 2
Switching of 5 _C is performed as follows. Y from the color scanner or the like as described above, M, C, K image data is provided to the selector switch 29 _D through OR gate 28. Changeover switch 29 _D, when the image data does not correspond to the missing part, the halftone% setter 30 dot% of tint from _T
Select the data T _D convey to the dot generator 1.
Dot generator 1 converts the dot% data _{T D} in the halftone dot signal _{D S.} The dot signal _{D S} is used as a changeover switch _{25 Y, 25 M, 25 C} switching control signal. Note that the dot% setter 30 _T, dot percentage data of the tint area your <br/> is preset.

[0025] When the dot signal D _S is in the ON state, i.e., if it is part to be exposed in a halftone spot color portion (tint) it is changeover switch 25 _Y, 25 _M, 25 _C
Are the spot color voltage signals Y ₄ from the spot color control circuit 24,
Select M ₄ and C ₄ . On the other hand, the concentration when the halftone dot signal D _S is in the OFF state, i.e., when a non-exposed portion, the changeover switch 25 _Y, 25 _M, 25 _C is missing density setter 26 _Y, 26 _M, 26 _C Select the voltage signal.

Changeover switches 25 _Y , 25 _M , 25 _C
Are output from the D / A converter 27.
_Y, 27 _M, 27 is converted into an analog signal respectively in _C, and through the AOM driver _{4 Y, 4 M, 4 C} AOM
5 _Y , 5 _M , 5 _C. As a result, each AOM5
The _Y, 5 _M, 5 _C, when drawing spot color area, the respective voltage values corresponding to the feature density is applied when drawing missing parts, since each voltage value corresponding to the through density is applied And a special color original can be printed on a photosensitive material with good reproducibility.

<Third Embodiment Apparatus> The third embodiment apparatus is a calibration apparatus for so-called conventional gravure printing, which is a printing method in which the dot area is fixed to a predetermined value and the density is changed according to the dot depth. Things. In the following, reference is made to FIG. However, in FIG. 5, the portions indicated by the same reference numerals as those in FIG. 2 or FIG. 4 are the same as the components described in the first and second embodiments, and thus detailed description thereof will be omitted.

As in the second embodiment, Y, M, C, and K image data from a color scanner or the like are supplied to changeover switches 29 _Y , 29 _M , 29 _C , and 29 _k . These changeover switches are used to control the network% based on the image data.
Dot% for conventional gravure from setter 30 _G
The data is selected and transmitted to the dot generator 1. The dot generator 1 converts the dot% data into a dot signal D _Y ,
The signals are converted into D _M , D _C , and D _k, and supplied to the signal synthesis circuit 2.
The signal synthesizing circuit 2 generates halftone signals D _Y , D
_M, and D _C combined with dot signal D _k of K-plate, Y is masked in this dot signal D _k, M, Synthesis halftone dot signal S _DY of C
, S _DM and S _DC are output. The combined halftone signals S _DY and S _DM
, S _DC is used as a switching control signal of the switch _{25 Y, 25 M, 25 C} .

When the combined halftone signals S _DY , S _DM , and S _DC are in the ON state, that is, when the halftone dots of the conventional gravure are to be exposed, the changeover switches 25 _Y , 25 _M , and 25 _C Selects the spot color voltage signals Y ₄ , M ₄ and C ₄ from the spot color control circuit 24. on the other hand,
Synthesis halftone dot signal S _DY, S _DM, when S _DC is OFF, i.e., if a non-exposed portion, the changeover switch 25 _Y, 25 _M, 25 _C is missing density setter 26 _Y, 26
Selecting a density voltage signal from _M, 26 _C.

That is, in the third embodiment, since the conventional conventional gravure has its halftone dot area fixed at a predetermined value, each color is converted based on the Y, M, C, and K image data. A halftone dot for conventional gravure is formed in the existing portion, and the density inside the halftone dot is adjusted by the special color control circuit 24.

<Fourth Embodiment> The fourth embodiment is a color image proofing apparatus suitable for calibrating a document in which ordinary halftone images (pictures) and spot colors are mixed. In the following, reference is made to FIG. In FIG. 6, portions denoted by the same reference numerals as those in FIGS. 2, 4, and 5 are the same as the components described in the above-described first to third embodiments, so that the detailed description here will be omitted. Omitted.

As in the first embodiment, the synthesized halftone dot signal S
_DY, given the S _DM, S _DC applied voltage generating unit 3 _Y, 3 _M, 3 _C
Erare, each synthesis halftone dot signal S _DY, S _DM, each per S _DC
The voltage value at the time of ON / OFF is determined by the applied voltage generators 3 _Y , 3 _M ,
Is output from the 3 _C switching switch 31 _Y, 31 _M,
31 _C is provided to one input terminal of each.

In the same manner as in the second and third embodiments, the changeover switches 25 _Y , 25 _M , and 25 _{C are used} to determine the density of each of the spot color voltages Y ₄ , M ₄ , C ₄ or Y, M, C. a voltage signal is output, these voltage signals are applied to each of the other input terminal of the switch _{31 Y, 31 M, 31 C} .

Changeover switches 25 _Y , 25 _M , 25 _C
The switching of the switches 31 _Y , 31 _M , and 31 _C is controlled by the position discriminator 32. Less than,
The function of the position discriminator 32 will be specifically described with reference to FIG. 7, symbol P is a color document, P ₁ is picture area of the normal dot, P ₂ is spot color area, the other areas are missing part. The color document P is set in a color scanner, and the coordinates of the picture area P ₁ and the special color area P ₂ are read in advance and set in the position discriminator 32. For example, if each of the areas P ₁ and P ₂ is a rectangular area, the picture area P ₁
Is given by the X and Y coordinates of points a and b, and the special color area P ₂ is given by the X and Y coordinates of points c and d. The position discriminator 32 receives a position signal of the current drawing position from a color scanner (not shown).

[0035] If the current drawing position is picture area P _1, the position determination unit 32 is switched switch 31 _Y, 3
1 _M and 31 _C are set on the side of the applied voltage generators 3 _Y , 3 _M and 3 c. As a result, the applied voltage generating unit 3 _Y, 3 _M, or 3c
These voltage values are changed over by the changeover switches 31 _Y , 31 _M , 31 _C
To the respective AOM drivers 4 _Y , 4 _M , and 4 _C.

On the other hand, if the current drawing position is featured portion P _2, the position discriminator 32 changeover switch 25 _Y, 2
The 5 _M, 25 _C and sets the feature control circuit 24 side, the changeover switch 31 _Y, 31 _M, 31 switches the _C switch 25 _Y, 25 _M, is set to 25 _C side. As a result, the special color density voltage signals Y ₄ , M ₄ , C ₄ are:
Changeover switch _{25 Y, 25 M, 25 C} , D / A converter _{27 Y, 27 M, 27 C} , and the changeover switch 3
Each AOM driver 4 _Y , 1 _Y , 31 _M , 31 _C
4 is given to _M, 4 _C. In this embodiment, when a spot color is exposed, the OR of the second embodiment (FIG. 4) is used.
Gate 28, changeover switch _29D , net% setter 30
_T and the dot generator 1 are required, but these are omitted for convenience of illustration.

If the current drawing position is in the missing portion, the position discriminator 32 switches the changeover switches 25 _Y and 2.
5 _M and 25 _C are set to the blank density setting devices 26 _Y , 26 _M and 26 _C
And the changeover switches 31 _Y and 31
_M, 31 switches the _C switch 25 _Y, 25 _M, 25 _C
Set to the side. As a result, each of the missing density voltage signals of Y, M, and C is changed by the changeover switches 25 _Y , 25 _M , 25 _C , D
The signals are supplied to the AOM drivers 4 _Y , 4 _M , 4 _C via the / A converters 27 _Y , 27 _M , 27 _C and the changeover switches 31 _Y , 31 _M , 31 _C.

As described above, according to the present embodiment, the voltage applied to the AOM is adjusted in accordance with each density value of the picture area, the special color area, and the missing portion, so that the color original can be exposed with good reproducibility. Can be baked on the material.

In the above-described embodiment, three channels of AOMs are installed in association with the R, G, and B light beams. However, when the photosensitive material is negative, multiple exposure is possible. Alternatively, each color may be printed by serial processing using an AOM of one channel. However, when the photosensitive material is positive, it is necessary to provide AOMs for three channels because simultaneous exposure is required due to its configuration.

[0040]

As apparent from the foregoing description, according to the invention described in claim 1, applied to the acoustic-optic modulator O
The N voltage value and the OFF voltage value are respectively adjusted to control the transmitted light amount of the burning light beam when the acousto-optic modulator is in the ON state and the OFF state . Accordingly
Therefore, according to the first aspect of the present invention, not only the halftone dot image area is used.
Color non-image areas other than halftone
Because the material can be colored to the desired color,
The image area is the same as the printed matter without changing the dot shape.
Calibration output such as
Even outside non-image areas have the same finish as printed matter
Calibration output can be obtained. According to the second aspect of the present invention, ink and paper quality used in an actual printing process
ON voltage value of acousto-optic modulator according to printing conditions such as
And the OFF voltage value are set in advance,
Not only the halftone image part where ink is attached on printed matter,
The same applies to printed materials where ink is not applied.
It is possible to obtain a calibration output that gives a finished result. Claim
The invention of Item 2 is particularly useful for printed matter of ordinary halftone images (pictures)
This is suitable for obtaining an image for color proofing. Claim 3
According to the invention described in (1), when printing a halftone dot image,
Voltage value (for example, negative type
ON voltage value for positive photosensitive material, positive type color
(OFF voltage value for photosensitive material)
The light beam when printing the halftone image.
Control the amount of transmitted light through the
Color original (color proofing image)
It is possible to perform density expression according to the degree of communication. Also,
When printing a non-image area, the other voltage value (for example,
For example, if the color photosensitive material is a negative type,
Pressure value and ON voltage value for positive type)
Set in advance according to the printing conditions such as paper quality used in the process.
To obtain a proof output equivalent to the actual printed matter.
Can be The invention of claim 3 is particularly suitable for special color printing.
Color proofing of prints and conventional gravure prints
This is suitable for obtaining an image for use. According to the fourth aspect of the present invention, a plurality of types of areas in a document are determined and
Is set in advance according to the printing moxibustion
ON voltage value and OFF voltage value , or color
ー Select the voltage value adjusted based on the image data.
Control the color density of halftone dots according to printing conditions.
Area and the color density of halftone dots are controlled according to the density value of the original
Faithful to the print quality of originals with mixed areas
A color proofing image reproduced in the above manner can be obtained. Claim
The invention of Item 4 is particularly suitable for ordinary dot images (pictures) and special colors.
A place to obtain color proofing images for mixed documents
It is suitable for the case. According to the fifth aspect of the present invention, when printing a missing portion on a color photosensitive material, a voltage value corresponding to the missing portion is applied to the acousto-optic modulator.
The missing portion of the document can be reproduced on the color proofing image by adjusting to the paper quality at the time of printing.

[Brief description of the drawings]

FIG. 1 is a diagram for explaining the principle of a color image proofing device according to the present invention.

FIG. 2 is a block diagram showing a schematic configuration of the first embodiment device.

FIG. 3 is a block diagram showing details of an applied voltage generator included in the device of the first embodiment.

FIG. 4 is a block diagram illustrating a schematic configuration of a device according to a second embodiment.

FIG. 5 is a block diagram showing a schematic configuration of an apparatus according to a third embodiment.

FIG. 6 is a block diagram showing a schematic configuration of an apparatus according to a fourth embodiment.

FIG. 7 is a diagram for explaining a function of a position discriminator included in the fourth embodiment device.

[Explanation of symbols]

1 ... dot generator 2 ... signal combining circuit 3 _Y, 3 _M, 3c ... application voltage generation unit _{4 Y, 4 M, 4 C} ... AOM driver _{5 Y, 5 M, 5 C} ... AOM 6 B, 6 G, 6 R ... Laser light source 7 ... Total reflection mirror 8, 9 ... Dichroic mirror 10 ... Imaging lens 11 ... Rotating cylinder 21 ... Density conversion circuit 22 ... Adder 23 ... Density-voltage conversion circuit 24 ... Special color control circuit _25Y , _25M , 25 _C ... changeover switch _{26 Y, 26 M, 26 C} ... through density setter _{27 Y, 27 M, 27 C} ... D / A converter _{29 D, 29 Y, 29 M} , 29 C, 29 k ... changeover switch 30 _T , 30 _G … net percentage setting device 31 _Y , 31 _M , 31 _C … changeover switch 32… position discriminator F… photosensitive material

Continuation of front page (72) Inventor Kimihiro Nakatsuka 5 in Higashikujo Minamiishidacho, Minami-ku, Kyoto Dainippon Screen Manufacturing Co., Ltd. Jujo Office (56) References JP-A-59-129854 (JP, A) Kaikai 61-1333769 (JP, A)

Claims (5)

(57) [Claims] An on- voltage value and an off-voltage applied to an acousto-optic modulator in a color image proofing apparatus for obtaining a color proofing image by directly printing a halftone image on a color photosensitive material from color image data of a document.
Adjust the values respectively, and turn on the acousto-optic modulator.
And controlling the transmitted light amount of the printing light beam in the OFF state, and printing the halftone dot image on the color photosensitive material with the light beam whose transmitted light amount is controlled, whereby the color photosensitive material develops a desired color. A color image proofing apparatus which controls the color density of each halftone dot on a color photosensitive material as described above. 2. A color image proofing apparatus according to claim 1,
Oite, the ON voltage of the acousto-optic modulator values and OFF voltage
Is a color image school preset according to the printing conditions.
Positive device. 3. The color image proofing device according to claim 1,
Here, the ON voltage value and the OFF voltage value of the acousto-optic modulator are
One of the voltage values is based on the original color image data.
The other voltage value is adjusted in advance according to the printing conditions.
Set color image proofing device. 4. A color image proofing apparatus according to claim 1,
The acousto-optic modulator is preset in accordance with printing conditions.
Apply fixed ON voltage value and OFF voltage value
The first voltage value adjusting means and the acousto-optic modulator provide color image data of a document.
ON lightning pressure value and OFF voltage value adjusted based on
A second voltage giving at least one voltage value of
Value adjusting means; position determining means for determining a plurality of types of areas in the document ;
The first voltage value adjusting means and the second voltage value adjusting means are
By selectively switching, one of the voltage value adjusting means
Switching for applying a voltage value from a stage to the acousto-optic modulator
And a color image proofreading apparatus. 5. A camera according to claim 1, wherein
In the color image calibration device, the ON voltage value and the OFF voltage value of the acousto-optic modulator are
One of the voltage values depends on the density of the blank part of the print.
Named color image proofing device set in advance.