JP3209907B2 - Video printer for displaying print images - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for enabling an image of a print result to be confirmed before printing in a video printer.

[0002]

2. Description of the Related Art A conventional video printer can confirm a stored image, but cannot display an image of a printed result. For example, even in a mode in which a stored image is reduced to one-quarter and four reduced images are arranged and printed on one sheet of photographic paper, the image confirmation display is the same as when printing without reduction. Was. Therefore, the user can confirm what kind of image is stored in the video printer, but cannot see what mode the video printer is in as an image. For this reason, there is a case where the video printer does not notice a mode that is not intended and prints by mistake.

[0005] Next, the problems in the conventional video printer will be described with reference to FIGS. 8 and 9. FIG. 8 shows an image of normal printing in a conventional video printer. Reference numeral 201 denotes an image storage unit. The picture in the rectangular frame represents the stored image data. Reference numeral 202 denotes an image display unit. An image 203 is displayed on the image display unit 202 and represents image data stored in the image storage unit 201. 204 is a print result,
Represents an image printed on photographic paper. 2. Description of the Related Art In a conventional video printer, as shown in FIG. 2, an image display unit confirms an image stored in an image storage unit and then actually performs printing.

FIG. 9 shows a conventional video printer in which an image stored in an image storage means is reduced to a quarter size, and the reduced four identical images are printed on one photographic paper. This shows an image when performing the same four-screen printing. 201 denotes an image storage unit 201 of FIG.
Is the same as 202 is the image display means 20 of FIG.
It is the same as 2. 203 is a display image 203 in FIG.
Is the same as Reference numeral 301 denotes the result of the same four-screen print. As can be seen from FIG. 9, four identical images are printed on the photographic printing paper. However, the image displayed on the image display means 202 is only one image, which is not different from that shown in FIG.

As apparent from the above description, in the conventional video printer, the image display means can confirm what kind of image is stored in the image storage means. I couldn't grasp it as an image. For this reason, it is appropriate to perform printing without noticing that the print mode is unintended. SUMMARY OF THE INVENTION It is an object of the present invention to eliminate such problems in the conventional video printer.

[0006]

A conventional video printer merely displays a stored image on a monitor regardless of a print mode. Therefore, it was possible to confirm what images were stored in the video printer,
It has not been possible to capture, as an image, where and how to print on photographic paper. For this reason, there was a case where an unintended one was printed and printing had to be performed again. The present invention displays a preview in which a photographic paper image and a printed image are superimposed on a monitor for image confirmation, and prevents a user from confirming the print image before printing, thereby preventing an operation error. The purpose is to:

[0007]

According to the present invention, there is provided a selection means for selecting image data read from image storage means, photographic paper color data read from photographic paper color storage means, and background color data read from background color storage means. To generate a preview image in which a photographic paper image is superimposed on a background color and a print image image is further superimposed thereon. By sending this preview image to the output means, a preview is displayed on a monitor for image confirmation.

According to the present invention, the image data read from the image storage means, the photographic paper color data read from the photographic paper color storage means, and the background color data read from the background color storage means are switched by the selection means. Then, a preview image is generated by superimposing a photographic paper image on a background color and a print image image thereon. As a result, a preview can be displayed on the monitor for image confirmation, and the pudding and the result can be captured as images.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 1 is a diagram showing a configuration of a video printer according to an embodiment of the present invention. Reference numeral 101 denotes an image storage unit, for example, a memory. Reference numeral 102 denotes input means, which is, for example, a combination of commercially available dedicated ICs such as an A / D converter IC and a decoder IC. An image control unit 103 is, for example, a microcomputer or a gate array. Reference numeral 104 denotes output control means, for example, a dedicated I / O such as a commercially available D / A converter IC or encoder IC.
C is a combination. Reference numeral 105 denotes a selection unit, for example, a TTL IC or a gate array. Reference numeral 106 denotes a photographic paper color storage unit, for example, a memory or a flip-flop. Reference numeral 107 denotes a background color storage unit, for example, a memory or a flip-flop.

Reference numeral 108 denotes a printing unit, which includes all necessary components for printing, such as a gate array for controlling printing and a printing mechanism. Reference numeral 109 denotes a system control unit, for example, a microcomputer. Reference numeral 110 denotes operation means, for example, operation keys and a remote control provided in the video printer. Reference numeral 111 denotes an image generating unit.
Not part of a video printer, eg TV, VT
R. Reference numeral 112 denotes an image display unit. It is not a part of a video printer, for example, a television or a monitor. First, three procedures of storage of an image, display of the stored image, and printing operation realized by a conventional video printer will be described below with reference to FIG.

Image storage procedure The operation unit 110 instructs the system control unit 109 to store an image. Upon receiving the storage instruction, the system control unit 109 instructs the image control unit 103 to start writing image data. The image control unit 103 controls writing to the image storage unit 101 in synchronization with the horizontal and vertical synchronization signals from the input processing unit 102. Further, a clock (A / D clock) for performing A / D conversion (converting analog data to digital data) is sent to the input processing means 102. The input processing means 102 is the image generating means 11
Perform processing such as decoding on the image signal from 1
After that, A / D conversion is performed by an A / D clock from the image control unit 103. The image storage unit 101 writes the image data from the input processing unit 102 under the control of the image control unit 103. By the above operation, the image data is stored in the image storage unit 101.

Display procedure of stored image The operation means 110 instructs the system control means 109 to display the image stored in the image storage means 101 on the image display means. Upon receiving the display instruction, the system control unit 109 instructs the image control unit 103 to start reading image data. The image control unit 103 performs read control on the image storage unit 101 in synchronization with the horizontal and vertical synchronization signals from the input processing unit 102. A clock (D / A conversion) for D / A conversion (converting digital data to analog data) is output to the output processing unit 104.
A clock). Further, a selection signal for instructing selection of image data is sent to the selection means 105.

The image storage means 101 reads out the stored image data. The selection means 105 is provided by the image control means 10
The image data is selected according to the selection signal from 3 and the image data is sent to the output processing means 104. The output unit 104 converts the image data into a D / A clock according to a D / A clock from the image control unit.
/ A conversion, and then perform processing such as encoding. The image display unit 112 displays the image data from the output processing unit 104. With the above operation, the stored image data is displayed.

The print operation procedure The operation means 110 instructs the system control means 109 to print the image stored in the image storage means 101. Upon receiving the display instruction, the system control unit 109 instructs the image control unit 103 to start reading image data and the printing unit to start printing. Image control means 103
Controls the image storage unit 101 to read out image data necessary for printing. Print control means 108
Receives image data from the image storage unit 101,
Print the image on photographic paper. The above is the printing operation procedure.

Next, a preview according to the present invention will be described. I ’ll explain the preview image first, then
An embodiment will be described. FIG. 2 shows an image when a normal printing is performed by the video printer according to the present invention. 201 is the same as the image storage means 201 of FIG. 202 is the same as the image display means 202 of FIG. 204 is the same as the print result 204 of FIG. Reference numeral 401 denotes an image of an image to be printed. Reference numeral 402 denotes an image on photographic paper. A background 403 serves to make the photographic paper image 204 easily visible.

The print image image 401 shown in FIG.
And photographic paper image 402 are previews, and represent images to be printed on photographic paper. This preview allows the user to grasp as an image how to print on photographic paper before printing.

FIG. 3 shows an image when the same four screens are printed by the video printer according to the present invention. 201 is the same as the image storage means 201 of FIG. 202
Is the same as the image display means 202 in FIG. 30
1 is the same as the same four-screen print result 301 in FIG. 402 is the same as the photographic paper image 402 shown in FIG. 403 is the same as the background 403 shown in FIG. Reference numeral 501 denotes the result of the same four-screen print.

In FIG. 3, an image of the print result 501 is displayed on the image display means 202. By displaying the print result on the image display means in this way, the user can grasp as an image what kind of mode the video printer is in and what is to be printed before printing. It is not necessary to perform unprinted printing. The above is the description of the preview image of the video printer according to the present invention.

Next, an embodiment of the present invention will be described with reference to FIG. The operation unit 110 instructs the system control unit 109 to perform a preview. Upon receiving the preview instruction, the system control unit 109 instructs the image control unit 103 to start the preview. Upon receiving a preview start instruction from the system control unit 109, the image control unit 103 starts detecting a position where the photographic paper image and the print image image are to be displayed on the image display unit 112. The detection of the display position in the vertical direction is realized by counting the horizontal synchronization signal starting from the time when the vertical synchronization signal is input. The detection of the display position in the horizontal direction is realized by counting the number of D / A clocks starting from when the horizontal synchronization signal is input. Then, using the detected horizontal and vertical position information, the timing for starting and ending the reading of the image data from the image storage means 101 and the timing for displaying the photographic paper image are determined. At the same time, a selection signal is sent to the selection means 105 for switching the output of the selection means 105.

The selection means 105 receives the image data from the image storage means 101, the photographic paper color data from the photographic paper color storage means 106, and the background color data from the background color storage means 107 in accordance with a signal from the image control means 103. Choose one. With this processing, preview data is generated in which a photographic paper image is superimposed on a background and a print image is superimposed thereon. The background color of the photographic paper image can be changed by rewriting the data stored in the photographic paper color storage means 106 and the background color storage means 107.

The output unit 104 performs processing such as encoding after D / A conversion of the preview data from the selection unit 105. The image display means 112 displays the preview data from the output means 104. The preview is realized by the above operation. Next, the inside of the image control means 103, which is a key to realizing the preview, will be described.

FIG. 4 shows a selection signal for generating a selection signal for switching the output of the selection means 104 to one of the background, photographic paper image, and print image image when performing preview in the image control means 103 shown in FIG. It is a generating means. Reference numeral 601 denotes a count valid unit, for example, a flip-flop. Reference numeral 602 denotes a vertical counting unit, for example, a TTL counter IC. Reference numeral 603 denotes horizontal counting means, for example, a TTL counter IC.
It is. An image range storage unit 604 is, for example, a memory or a flip-flop. Reference numeral 605 denotes an image range detection unit, for example, a comparator. Reference numeral 606 denotes a photographic paper range storage unit, for example, a memory or a flip-flop. Reference numeral 607 denotes photographic paper range detection means.
It is a comparator. Reference numeral 608 denotes photographic paper invalidation means, which is, for example, a combination of basic gates such as an AND gate and an inverter.

The operation of FIG. 4 will be described. Upon receiving a preview start instruction from the system control unit 109 and receiving the first vertical synchronization signal, the count validating unit 601 sends an enable signal for validating the count operation to the vertical counting unit 602 and the horizontal counting unit 603. . The vertical counting unit 602 counts the horizontal synchronization signal based on the enable signal from the count valid unit 601.
This count value indicates a vertical scanning position on the image display unit 112.

The horizontal counting means 603 counts the number of D / A clocks based on the enable signal from the count validating means 601. This count value is displayed on the image display unit 112.
Represents the scanning position in the horizontal direction. The image range detection unit 605 stores the image range storage unit 604.
While the vertical count means 602 and the horizontal count means 603 indicate the range in which the print image is to be displayed, an image data selection signal for selecting print image data is output to the selection means 105.
Note that this image data selection signal has the highest priority.

The photographic paper range detecting means 607 determines the range in which the image is to be displayed, which is stored in the photographic paper range storage means 606, by the vertical counting means 602 and the horizontal counting means 603.
During this time, a photographic paper data selection signal for selecting photographic paper image data is output to the selection means 105. The photographic paper data selection signal has a lower priority than the image data selection, and is invalidated by the photographic paper invalidation means 608 while the image data selection signal is being output. If neither the image data selection signal nor the photographic paper data selection signal is output, a signal for selecting the background with the lowest priority is output to the selection means 105.

The above is the description of the selection signal generating means shown in FIG. In this way, the print data image, the photographic paper image, and the background can be switched, and the preview data can be output from the selection unit 105.

FIG. 5 shows an image storage unit 101 when a preview is performed in the image control unit 103 shown in FIG.
Address generation means for controlling the read address of the address. Reference numeral 701 denotes a horizontal address generation unit, for example, T
This is a TL counter IC. Reference numeral 702 denotes a horizontal address conversion unit, for example, a selector. A horizontal address offset unit 703 is, for example, a combination of an adder and a memory. Reference numeral 704 denotes a screen width detecting unit, for example, a comparator. Reference numeral 705 denotes a screen width storage unit, for example, a memory.

Reference numeral 706 denotes a vertical address generation means, for example, a TTL counter IC. Reference numeral 707 denotes a vertical address conversion unit, for example, a selector. Reference numeral 708 denotes a vertical address offset means, for example, a combination of an adder and a memory. Reference numeral 709 denotes an image height detecting unit, for example, a comparator. Reference numeral 710 denotes an image height storage unit, for example, a memory. Reference numeral 711 denotes a field discriminating unit, which is, for example, a combination of a monomultivibrator and a flip-flop.

The operation of FIG. 5 will be described. In the following description, image data necessary for printing (hereinafter, referred to as print data) is represented by a quarter (（(width) × １ ／).
The data reduced to the (high) size is used as print image data. First, a procedure for generating a horizontal read address will be described. The operation of the horizontal address generation unit 701 is enabled by the image data selection signal from the image range detection unit 605 shown in FIG.

The horizontal address generation means 701 counts the number of D / A clocks and indicates a horizontal read address of the image storage means 101. The signal counted by the horizontal address generation unit 701 may be a clock synchronized with D / A, for example, a CAS necessary for controlling a dynamic memory. The read address indicated by the horizontal address generation unit 701 is
It is reset to 0 by the horizontal synchronizing signal or the screen width detecting means 704.

The horizontal address converter 702 converts the read address from the horizontal address generator 701. In the case of this example, half of the width of the print data
It is necessary to reduce the horizontal address conversion means 70
2 doubles the read address from the horizontal address generation means 701. If the print data is to be reduced to 1/16 and displayed, the read address from the horizontal address generator 701 is quadrupled.

The horizontal address offset means 703 gives an offset to the read address from the horizontal address conversion means 702. Horizontal address offset means 7
The address output from 03 is the horizontal read address of the image storage unit 101. The value of the offset itself means a horizontal read start address from the image storage unit 101.

The screen width detecting means 704 stores the address value from the horizontal address generating means 701 and the screen width storing means 70.
When a match with the value stored in 5 is detected, the address value of the horizontal address generation means 701 is reset to 0, and at the same time, the address value of the vertical address generation means 702 is advanced by one.

The horizontal address generator 701 resets the count value to 0 by the screen width detector 704,
Start counting D / A clocks again. The horizontal address generation means 701 repeats the above series of operations while the image data selection signal is valid. Accordingly, if the horizontal valid period of the image data selection signal is set to twice the period necessary for displaying the screen width stored in the screen width storage unit 704, the same screen in the horizontal direction can be displayed twice. Can be displayed on the screen. The above is the procedure for generating addresses in the horizontal direction.

Next, a procedure for generating a read address in the vertical direction will be described. The operation of the vertical address generation unit 706 is enabled by the image data selection signal from the image range detection unit 605 shown in FIG. The vertical address generation unit 706 counts the detection signal from the screen width detection unit 704 and indicates a vertical read address of the image storage unit 101. The read address indicated by the vertical address generation unit 706 is a vertical synchronization signal or a screen height detection unit 709.
Is reset to 0.

The vertical address conversion means 707 converts the read address from the vertical address generation means 706. In the case of this example, it is necessary to reduce the height of the print data by half, so that the vertical address conversion means 70
Numeral 6 doubles the read address from the vertical address generation means 706. Further, assuming that the image display means 112 performs interlaced scanning, the image data is further doubled (that is, 4 times).
Then, 0 is added in the first field and 2 is added in the second field. If the print data is desired to be displayed at 1/16, the read address from the vertical address generation unit 706 is quadrupled, and if it corresponds to interlaced scanning, the read address is further doubled (ie, octupled).
0 is added in the first field, and 4 is added in the second field. The first field and the second field are determined by the field determination unit 711 based on the phase relationship between the horizontal synchronization signal and the vertical synchronization signal.

The vertical address offset means 708 gives an offset to the read address from the vertical address conversion means 706. Vertical address offset means 7
The address output from 08 is the vertical read address of the image storage unit 101. The value of the offset itself means a vertical read start address from the image storage unit 101.

The screen height detecting means 709 stores the address value from the vertical address generating means 706 and the screen height storing means 71.
When the coincidence with the value stored in “0” is detected, the address value of the vertical address generation unit 706 is reset to “0”.
The vertical address generation unit 706 includes a screen height detection unit 709.
The count value is reset to 0 by the
Start counting the detection signals from 04. The vertical address generation means 706 repeats the above-described series of operations while the image data selection signal is valid. Accordingly, if the vertical valid period of the image data selection signal is set to twice the period necessary for displaying the screen height stored in the screen height storage means 709, the same screen in the vertical direction can be displayed twice. Can be displayed on the screen. The above is the procedure for generating addresses in the vertical direction.

As described above with reference to FIGS. 1, 4 and 5, a preview can be realized by switching data by the address control and the selection means. Also,
Since the present invention does not rewrite the contents of the image storage means, it is not necessary to rewrite the contents of the image storage means every time the print mode is changed.

(Embodiment 2) FIG. 6 is a diagram showing another embodiment according to the present invention. FIG. 6 shows the ink discriminating means 8 shown in FIG.
01 is obtained by adding color adjustment means 802. The ink discriminating unit 801 is provided in the printing unit 108, and reads a reflection plate or a code ring attached to the ink cassette in order to discriminate the type of ink with a sensor. Cassette). The ink discriminating means 801 itself is also provided in a conventional video printer.

The color adjustment means 802 is provided in the image storage means 101.
This adjusts the brightness and hue of the image data read from the. The color adjusting means 802 is provided in a conventional video printer, and the amount of adjustment can be changed by operating means such as operation keys and a remote controller provided in the video printer.

The ink cassette mounted on the video printer has the same shape, but is provided with a reflector and a code ring so that the type and characteristics of the ink inside the ink cassette can be determined. The video printer reads these reflectors and code rings to determine the optimal hue and density of the print result. The inside of the ink cassette includes not only color ink but also black and white ink. This is also determined by a reflector or the like, and brightness data (brightness data) of the image data stored in the image storage means is used as data for printing.

As described above, the conventional video printer optimizes the printing by determining the type of the ink cassette. However, no processing is performed on the image displayed on the image display means. An object of the present invention is to adjust the brightness, hue, and saturation of an image displayed on an image display unit according to the type of ink, and to allow a user to grasp the hue, density, and the like of a print result before printing. .

An embodiment will be described with reference to FIG. The type of the ink cassette (ink) attached to the video printer is determined by the ink determining unit 801, and the determination result is sent to the system control unit 109. System control means 109
Notifies the color adjustment unit 802 of the adjustment amounts of the brightness, hue, and saturation based on the determination result from the ink determination unit 801.

Although the conventional system control means adjusts the color adjustment means only by instructions from operation means such as operation keys and a remote controller, the present invention is different in that an adjustment instruction from ink discrimination means is also accepted. Is a point. The color adjustment unit 802 adjusts brightness, hue, and saturation based on the adjustment amount from the system control unit 109. For example, it is assumed that the result of the discrimination of the ink cassette type by the ink discriminating unit 801 is monochrome ink.

The system control means 109 sets the saturation amount of the color adjustment means 802 to 0 based on the result that the ink is black and white. The color adjustment unit 802 outputs only the lightness component of the image data in order to set the saturation amount to zero. Thereby, a black and white image is displayed on the image display means 112, and the user can recognize that the black and white ink is mounted in the color of the displayed image. Therefore, it is possible to eliminate an operation error such as a mistake between the color ink and the black and white ink.

When the ink to be mounted is a color ink, the density and hue of the print result differ depending on the type. If the characteristics such as the hue due to the difference in the ink can be reflected on the image display means, it is very convenient when the user adjusts to a desired color. As described above, by reflecting the determination result of the ink determination unit on the color adjustment unit, it is possible to improve the operability of color adjustment and eliminate the mistake of the ink cassette.

(Embodiment 3) FIG. 7 is a diagram showing another embodiment of the preview according to the present invention. FIG. 7 is obtained by adding a preview storage unit 901 to FIG. The preview storage unit 901 is, for example, a memory. The embodiment described with reference to FIG.
5, switching of image data is performed. In the embodiment shown in FIG. 7, the preview output from the selection unit 105 is stored in the preview storage unit 901 as it is. Thus, the preview can be displayed on the image display unit 112 only by reading out the preview data stored in the preview storage unit 901.

Since it is not necessary to write the preview into the preview storage means 901 in accordance with the horizontal synchronizing signal or the vertical synchronizing signal, complicated address control can be easily realized. Therefore, a preview of a complicated deformed image can be realized only by reading out the preview data stored in the preview storage unit 901. As described above, according to the present invention,
Simply by reading out the preview data stored in the preview storage means, a preview of a complicatedly deformed image can be realized, and the operability of the video printer can be improved.

[0050]

According to the present invention, it is possible to display an image of a print result on an image display means, so that it becomes clear how to print on photographic paper before printing, and an unintended print is performed. Can be prevented beforehand, and the operability of the video printer can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing an embodiment of a preview according to the present invention.

FIG. 2 is a diagram showing an image of a normal print in a video printer according to the present invention.

FIG. 3 is a diagram showing an image of the same four-screen print in the video printer according to the present invention.

FIG. 4 is a diagram showing a selection signal generation unit according to the present invention.

FIG. 5 is a diagram showing an address generation unit according to the present invention.

FIG. 6 is a diagram showing another embodiment of a preview according to the present invention.

FIG. 7 is a diagram showing another embodiment of a preview according to the present invention.

FIG. 8 is a diagram illustrating an image of a normal print in a conventional video printer.

FIG. 9 is a diagram showing an image of the same four-screen print in a conventional video printer.

[Explanation of symbols]

 101 image storage means 102 input processing means 103 image control means 104 output control means 105 selection means 106 photographic paper color storage means 107 background color storage means 108 printing means 109 system control means 110 operation means 111 image generation means 112 image display means 801 ink Determination means 802 color adjustment means 901 preview storage means

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Omata 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Multimedia System Development Division, Hitachi, Ltd. (72) Inventor Yoshiaki Mochimaru Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa 292 Hitachi Image Information Systems Co., Ltd. (72) Inventor Hideaki Ito 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Hitachi Image Information Systems Co., Ltd. (72) Junichi Shoji 1410 Inada, Hitachinaka-shi, Ibaraki Hitachi, Ltd. Manufacturing Company Personal Media Equipment Division (56) References JP-A-7-298191 (JP, A) JP-A-7-327197 (JP, A) JP-A-5-219466 (JP, A) JP-A-5-219466 145882 (JP, A) JP-A-5-85009 (JP, A) JP-A-9-54665 (JP, A) JP-A-3 70025 (JP, A) JP Akira 62-229426 (JP, A) JP Akira 61-80328 (JP, A) (58 ) investigated the field (Int.Cl. ^7, DB name) B41J 21/00 B41J 2 / 00 H04N 5/76 H04N 5/91

Claims (8)

(57) [Claims] 1. An image storing means for storing an image, and an input processing means for separating a horizontal and vertical synchronizing signal of an image signal inputted from an image generating means or converting the image signal into data storable by the image storing means. Image control means for controlling writing and reading of the image storage means in synchronization with horizontal and vertical synchronization signals from the input processing means; and for confirming an image of data read from the image storage means. Output processing means for performing processing for enabling display on the image display means, image data arranged between the image storage means and the output processing means, read from the image storage means, and photographic paper Photographic paper color data from the color storage means;
Selecting means for selecting any of the background color data from the background color storing means according to an instruction of the image control means; printing means including means for controlling printing of the image data stored in the image storing means; A video printer having a system control unit that receives instructions from the unit and gives various instructions to the image control unit and the print control unit, wherein the image data stored in the storage unit is switched by the output of the selection unit. A video printer having a function of displaying an image image (hereinafter, referred to as a preview) printed on photographic paper on the image display means and confirming an image of a print result before printing. 2. A video printer according to claim 1, wherein a function of adjusting a display size of a preview photographic paper image and a display size of a print image image by adjusting a timing of a selection signal for switching an output of said selection means. A video printer, comprising: 3. The video printer according to claim 1, wherein at the time of preview, data is always read from the image storage means in a fixed direction (for example, only in a horizontal direction), and a timing at which a selection signal of the selection means is switched is adjusted. , The photographic paper image is rotated 90 degrees by swapping the ratio of the length and width of the photographic paper image of the preview,
A video printer having a function of realizing a preview when an image is rotated by 90 degrees and printed. 4. The video printer according to claim 1, wherein data obtained by thinning out image data necessary for printing to a quarter data size is used as preview print image image data, and only by controlling an address of said image storage means. A video printer having a function of displaying a preview print image. 5. The video printer according to claim 1, wherein the background color data stored in the background color storage means and the photographic paper image color stored in the photographic paper color storage means are rewritten, so that the preview background color is obtained. A video printer having a function of adjusting a photographic paper image color. 6. The video printer according to claim 1, further comprising a function capable of displaying a preview at an arbitrary position on said image display means by adjusting a timing of a selection signal for switching an output of said selection means. A video printer. 7. The video printer according to claim 1, further comprising an ink discriminating unit for discriminating a type of the ink cassette loaded in the printing mechanism, and a color adjusting unit for adjusting brightness, hue, and saturation of the image storage unit. A video printer having a function of changing a preview display color according to the type of ink. 8. The video printer according to claim 1, further comprising preview storage means for storing preview images (photographic paper image and print image image), writing the preview image in said preview storage means, and storing preview data in said preview storage means. A video printer having a function of displaying a preview on an image display means by reading out the image.