JPH01232878A - Digital color copying machine - Google Patents

Abstract

PURPOSE:To attain color adjustment without waste of paper and color toner by applying different color correction to a picture data of a specific area set in an original picture and forming plural pictures subjected to colors correction to different positions on one and same paper sheet. CONSTITUTION:An original picture is read by a CCD 14 and its picture data is inputted to a monitor picture memory circuit 201 via a log amplifier 21, an A/D converter 22 and a shading correction circuit 23. An output of the monitor picture memory circuit 201 is given to a monitor picture tone setting circuit 202 via a masking processing circuit 24 to apply different color correction to the specific area in the picture by the circuit 202. The plural picture data whose color is subjected to different color correction are formed on different positions on one and same paper sheet by a print head section 31.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a digital color copying machine that allows easy color adjustment.

[Conventional technology and its problems]

Conventionally, digital color copying machines convert the original image read by an image element into image data, which is a digital signal, and print (form) an image on paper using electrophotography according to this image data. It is publicly known.

In digital color copying machines, the most important point in terms of performance is color reproducibility, that is, forming an image with colors as close as possible to the colors of the original image.

- Even if the color difference does not appear that much in the first copy, if you perform so-called generation copying, in which the copied image is re-copied as the original, there will be a considerable difference in color from the original image of the original. arise.

Conventional digital color copying machines are equipped with a color adjustment device for performing color adjustment, and the operator operates this color adjustment device to vary the color and select a color that is considered to be close to the original. , or can be adjusted to the operator's favorite color.

However, in this conventional digital color copying machine, each time the color adjustment device is operated, it is impossible to know how the color adjustment has been performed unless the copy is actually made and the copied image is viewed. Therefore, it is necessary to perform trial printing many times to make color adjustments, which consumes a lot of paper and expensive color toner, and requires time and effort, leading to an increase in running costs. Ta.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a digital color copying machine that can perform color adjustment without wasting paper and color toner.

[Means to solve the problem]

In order to solve the above problems, the present invention provides a means for setting a specific area in a document image, a means for performing color correction on the image of the specific area, and a plurality of images subjected to different color corrections. and means for forming the images at different positions on the same sheet of paper.

[For production]

The means for setting a specific area sets an area (area of interest) in which color adjustment is particularly desired in the original image. Various different color corrections are performed on the image of the region of interest, and these multiple images are copied at different positions on the same sheet of paper.

The operator can select the image closest to the color of the original image, or the operator's favorite color, from among the images of a plurality of regions of interest in different colors copied onto a single sheet of paper. You can easily adjust the color by

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the overall configuration of the copying machine.

This copying machine converts an original image read by an image sensor into image data, which is a digital signal, and prints (forms) an image on paper using an electrophotographic method in accordance with this image data.

In FIG. 1, the scanner 10 includes an exposure lamp 12 that illuminates the original, a Rondo lens array 13 that collects reflected light from the original, and a contact CCD that converts the collected light into an electrical signal. It is equipped with a color image sensor 14.

The scanner 10 uses a motor 11 when reading an original image.
, and scans the original on the original platen 16.

The original image irradiated by the exposure lamp 12 is photoelectrically converted by the image sensor 14, and converted by the signal processing section 20 into a print signal of one of yellow, magenta, cyan, or black.

In the print head section 31, the LD drive circuit 33 operates according to the print signal for each color from the signal processing section 2o, and the semiconductor laser 34 blinks (see FIG. 3).

A laser beam generated from the semiconductor laser 34 is reflected by the reflecting mirror 37 and exposes the photosensitive drum 41.

The surface of the photosensitive drum 41 is uniformly charged by a charging charger 43, and an electrostatic latent image is formed by receiving the above-described exposure.

This electrostatic latent image is developed into yellow, magenta, cyan, or black by one of the developing devices 45a to 45d.

The developed image is transferred by the transfer charger 46 onto a sheet of paper wrapped around the circumferential surface of the transfer drum 51.

After the above steps are repeated for at least one color of yellow, magenta, cyan, or black,
The paper is separated from the transfer drum 51 by the separation claw 47, fixed by the fixing device 48, and then transferred to the paper output tray 49.
The paper is ejected. Between these, the scanner 10
The scanning operation is repeated in synchronization with the rotational operation of the photosensitive drum 41 and the transfer drum 51.

Note that the paper is fed from a paper cassette 50, and is also fed by a chucking mechanism 52 provided on the transfer drum 51.
The tip is chaffed to prevent misalignment during transfer of each color. Further, 42 is an eraser lamp.

FIG. 2 is a diagram showing the arrangement of various keys on the operation panel 70 provided on the top surface of the copying machine.

The operation panel 70 includes a print start key 71 for starting a copying operation, an interrupt key 72 for specifying interrupt copying, a clear/stop key 73, an all reset key 74, a numeric keypad 75, a set key 76, a cancel key 77, Function keys 78 to 81, jitter dials 82 and 83 for setting the attention area (to be described later), and a display section 84 consisting of a liquid crystal display that displays a document image and various messages for setting the attention area.
is provided.

FIG. 3 is a block diagram showing the configuration of the signal processing section 20. As shown in FIG.

In this figure, a monitor image memory circuit 201 and a monitor image tone setting circuit 202 are characteristic parts of the present invention, and are designed not to operate when a normal copying operation is performed. These will be described later.

R (red) photoelectrically converted by the image sensor 14,
Each image signal of the three colors G (green) and B (blue) is
Each signal is operationally amplified by a log amplifier 21 into a signal having a magnitude corresponding to the image density, and then converted into a digital signal by an AD converter 22. This digital signal is an image signal (image data) having gradation, and then a shading correction circuit 23 performs shading correction, and a masking processing circuit 24 performs R, R,
G.

Image signals (print signals) for printing corresponding to each print color of Y (yellow), M (magenta), C (cyan), and B (black) are developed from the image signals of the three colors of B. It is generated according to the characteristics of the toner in the containers 45a to 45d.

Generally, print signals Y, M are converted from original image signals R, G, B.
, C is expressed as follows.

Each of the conversion coefficients a0° to a2□ is preset to an appropriate value by theory and experiment so that an image with a color as close as possible to the original image is printed.

Note that the print signal for which color is generated is determined by C.
It is determined sequentially by a control signal from the PU26.

The halftone processing circuit 25 binarizes the print signal from the masking processing circuit 24 using, for example, a dither method.
A binary pseudo-halftone signal is generated.

The clock generator 27 generates a horizontal synchronization signal 5L (Hsync
) and a dot clock signal S2 (CKA), which are supplied to each block of the signal processing section 20.

In the signal processing section 20, as shown in FIG. 6, image data from the image sensor 14 is serially processed in synchronization with the dot crotter signal CKA. Furthermore, each time the horizontal synchronization signal Hsync is generated, the lines in the main scanning direction are updated.

In other words, it advances by a unit distance in the sub-scanning direction.

Now, as described above, although an appropriate print signal is generated by the masking processing circuit 24, it is difficult to suppress the difference in color between the original image and the print image to a very small value for all colors. However, within a certain limited chromaticity range, it is possible to minimize the difference by performing color tone adjustment.

In this example, we focused on this point, and in the document image,
Areas where the operator particularly wants to place emphasis on color reproduction (areas of interest)
is stored in the image RAM, read out multiple times, and slightly different color adjustments are applied to each read image, and reproduced by changing the position on one sheet of paper in one printing process, so that the operator can After selecting the most preferable color image among them, the entire document image is copied based on the adjustment value (adjustment coefficient).

Note that one printing process refers to one copying process for a monochrome image, and refers to a number of copying processes equal to the number of primary colors used for a color image.

Next, this color adjustment selection control (hereinafter referred to as mosaic monitor) will be explained.

The mosaic monitor is realized by a monitor image memory circuit 201 that stores a region of interest, and a monitor image tone setting circuit 202 that performs color adjustment in the printing process.

(Monitor Image Memory Circuit) FIG. 4 is a circuit diagram of the monitor image memory circuit 201.

First, a method for setting an attention area will be described with reference to FIG. 8.

By placing a document on the document table 16 and performing a preliminary scan with the scanner 10, the display section 8 of the operation panel 70
The original image is roughly displayed in the original area ED of 4, and the main scanning direction (X direction) and sub-scanning direction (Y direction)
The indication lines LPY and LPX are displayed (see Figure 8).
These instruction lines LPY.

The intersection of LPX becomes the center of the attention area EA. When the jog dials 82 and 83 are operated, these indication lines move up and down or left and right, respectively, thereby defining the attention area EA, and by pressing the set key 76, the attention area is set.

The attention area EA is, for example, about 2'C1 as shown in FIG.
It has a size of 11 squares, and the coordinates of each vertex are input and transmitted to the CPU 26 through the communication system as necessary. Note that the size of the attention area is determined by the monitor image memory circuit 2.
It is equal to the storage capacity of the image RAM 403 in 01.

It is possible to easily calculate which line the attention area EA is located in as seen from the leading edge of the image, and in which pixel range in the main scanning direction the attention area EA is located.

The CPU 26 sets this range as a write area setting signal in the write area determination circuit 406.

The write area determination circuit 406 is configured in the main scanning direction (X direction).
A discrimination circuit 406a for discriminating the area and a sub-scanning direction (Y
It consists of a discriminating circuit 406b that discriminates the area in the direction (direction).

Each discrimination circuit 406a, b counts the dot clock signal CKA or the horizontal synchronization signal Hsync while the image leading edge signal S5 is being input, and compares whether the count value is within the writing area setting range. .

If it is within the setting range in the main scanning direction or the sub-scanning direction, the signal S3 (low active WEX signal) or the signal 34 (low active WBY signal) becomes "L".

The write address generation counter 405 is composed of a counter 405a in the main scanning direction and a counter 405b in the sub-scanning direction, like the above-mentioned write area determination circuit 406.
One counter 405a outputs the dot clock signal CKA when the signal S3 from the discrimination circuit 406a is "L".
is counted and an address related to the main scanning direction is generated. Further, the other counter 405b outputs a horizontal synchronizing signal Hsy when the signal S4 from the discrimination circuit 406b is rL.
nc is counted and an address related to the sub-scanning direction is generated.

Note that the address related to the main scanning direction (counter 405a
The contents of counter 405b) are cleared by the horizontal synchronization signal Hsync, and the address related to the sub-scanning direction (counter 405b
) is cleared by the image leading edge signal S5 generated by the CPU 26.

The address generated in this manner is manually input to the address terminal of the image RAM 403 via the selector 404.

By the way, the gate 409 receives the above-mentioned signals S3 and S4 and the dot clock signal s2 (CKA) through the inverter 4.
The signal S6 inverted by 10 and the data holding signal S7 from the CPU 26 are input, and when it is within the write area range and the data holding signal S7 is "L" (active), the signal S6 is input to the gate 409. It will appear in the output.

Also, the signal S8 for switching between writing and reading is “
When the output of the gate 411 becomes "LJ" and the output of the inverter 412 becomes "H", the selector 404 selects the output of the write address generation counter 405, and the image RAM M2O3 becomes the write address. mode. Note that the output signal S13 of the inverter 412 is
It is also sent to a selection signal generation circuit 425 of the monitor image tone setting circuit 202, which will be described later.

Image data with gradation from the shading correction circuit 23 is input to the input/output terminal (■10 terminal) of the image RAM 403 via the selector 401 and the image selection circuit 402, and this image data is The data are sequentially written to the designated addresses as described above in synchronization with the clock signal CKA.

As a result, the image of the attention area EA is stored in the image RAM 40.
Written in 3.

When writing to the image RAM 403 is completed, the CPU 2
6 sets the data holding signal S7 to rH and holds the written contents.

Next, reading from the image RAM M2O3 will be explained.

As shown in FIG. 9, the image of the attention area EA is divided into three sections in the main scanning direction (X direction) and nine sections in the sub scanning direction (Y direction).
It is assumed that a mosaic monitor image GM with a total of 27 various color adjustments is output onto one sheet of paper P. These images GM have coordinates x in the main scanning direction on paper P.
It is output between coordinates y0 and yl in the sub-scanning direction between 0 and Xl.

In this case, the method of reading out the image RAM M2O3 is to read out the contents of the same line three times in the main scanning direction of the image stored in the image RAM M2O3, and
When all the contents have been read out in the sub-scanning direction, the first line is read out again in the same manner as described above, and this is repeated nine times.

When reading the image RAM 403, the signal S8 from the CPU 26 becomes rH, which causes the selector 4 to
04 selects the output of the read address generation counter 407, the output of the inverter 412 becomes "L", and the image RAM 403 enters the read mode.

The read area determination circuit 408 determines the read area for the paper P, and similarly to the above-mentioned write area determination circuit 406, it includes a determination circuit 408 a that determines the area in the main scanning direction (X direction) and in the sub-scanning direction. It consists of a discrimination circuit 408b that discriminates the area in the (Y direction).

In each discrimination circuit 408a, b, if each count value is X or Y, then X0≦X≦X.

y0≧Y≧y.

Coordinate values that can be determined to be within the area when the following conditions are met: Xo + XI + 3'OI 3'l
is given in advance by a readout area setting signal.

Output signal S of each discrimination circuit 408a,b 9. (REX signal that is low active) and 510 (REV signal that is low active) are both enabled, an address is generated by the read address generation counter 407, and the image RAM is processed according to the generated address.
The contents of 2O3 are read out and the held image data is output to the masking processing circuit 24.

At this time, the read address generation counter 407 is requested to count even if it exceeds its maximum value, but at that time, each generation counter 407a, b outputs an overflow signal Sll, Si2 and starts counting again from the initial value. Start.

These overflow signals Sll and S12 are sent to a monitor image tone setting circuit 202, which will be described later, and are used to switch the color correction coefficients.

Note that when reading the image RAM 403, the output of the image selection circuit 402 is in a high impedance state, and when the image RAM 403 is not being read, the selector 401 outputs "white" image data to the subsequent stage. "White" data is selected.

(Monitor picture setting circuit) FIG. 5 is a circuit diagram of the monitor image tone setting circuit 202.

The monitor tone setting circuit 202 is a circuit that performs color correction (color adjustment) of a mosaic monitor image.

Color adjustment is performed by calculating Y + = k + Y M l = k z M C + "k3c" for each print signal Y, M, and C obtained by calculating the above formula (1), and adjusting. The printing signals Y,,M,.

The goal is to obtain C1. Here, kl and km are coefficients for adjustment.

In the mosaic monitor image GM shown in FIG. 9, the coefficient 1 for Y (yellow) does not change in the sub-scanning direction, but changes as V a + 3' I + Vt in the main scanning direction, and M(
The coefficient of 2 (magenta) does not change in the main scanning direction, and for each block in the sub-scanning direction, me, m+1 mt + m
The coefficient of C (cyan) does not change in the main scanning direction, but changes as co + CI + CZ every three blocks in the sub-scanning direction.

Therefore, in the monitor image tone setting circuit 202, the coefficients are changed for each of the print signals Y, M, and C as described above.

Now, the multiplier 421 receives the above-mentioned print signals Y, , Ml
, C1. Here, in order to set three different coefficients in the main scanning direction, three latches LL, L2 . A latch circuit 422 consisting of L3 is provided, and these latch circuits 422 include CP
The coefficients output from U26 are set. This setting procedure will be explained in the flowchart described later.

The latch circuit 422 consisting of three latches was provided because
In the main scanning direction, the coefficient change period is short, and the CPU2
This is because it is difficult to set in real time using 6. Note that if it is desired to have n types of coefficients, n latches may be provided in parallel.

In the monitor image memory circuit 201 described above, the image RA
An overflow signal Sll in the main scanning direction generated when reading M2O3 is input to the selection signal generation circuit 424, and is input to the selector 423 as a signal 521 via the selector 426. Note that the selector 426
is adapted to transmit the output of the selection signal generation circuit 424 to the selector 423 in the mosaic monitor mode.

The selection signal generation circuit 424 generates an overflow signal Sll.
Each time Ll is input, the selector 423 selects each launch Ll,
L2. ．． A signal is output that sequentially selectively switches L3.

As a result, each coefficient latched in the latch circuit 422 is selectively and sequentially sent to the multiplier 421.

Each latch LL, L2. The setting input of L3 is given a coefficient for a monitor image that is the next block in the sub-scanning direction.

Image RAM 403 in monitor image memory circuit 201
The sub-scanning direction bone overflow signal SI2 generated when reading is input to the selector 427, and the selector 427 transmits this to the latch circuit 422 in the mosaic monitor mode. As a result, each time the overflow signal 312 is output, the latch circuit 422 latches and updates the input data (coefficients), and outputs the updated data to the multiplier 421 via the selector 423.

Therefore, when the block changes in the sub-scanning direction,
The set of coefficients is changed immediately.

FIG. 7 is a flowchart for setting coefficients for color adjustment.

This process is executed as an interrupt routine by interrupting the CPU 26 every time the horizontal synchronization signal Hsync is generated.

Among these, the counter Ct1 counts the distance from the leading edge of the image in the sub-scanning direction, and detects the beginning of printing and the edge of a printing line in the mosaic monitor image GM.

The counter Ctt counts the distance in the sub-scanning direction and detects changes in blocks of the mosaic monitor image. Tl represents the distance from the leading edge of the image to the print position of the mosaic monitor image, and l represents the distance in the sub-scanning direction of 1 pro7 (
(See Figure 9).

The state is determined in step #1, and its value "0" to "
4", the process branches to a predetermined step.

When the state is "0", it is determined whether the leading edge of the image (leading edge of paper P) is reached (step #2), and when the leading edge of the image has passed, the counter Ct is initialized (step #3), and the state Set to "1" (Step #4)
.

When the state is "1", wait for the counter Ctl to become T1, that is, wait for the position of the coordinate y0, which is the tip of the mosaic monitor image GM (step #6
), then states r2J, [3J, r4 . Jump to one of them.

In other words, if Y (yellow) (YES in step #7), set the state to "2" (step #8)
. When M (magenta) (yes at step #9),
Initialize the counter Ct, step #10), set the variable i to rQJ, step #11), and set the state to "3".
” (Step #12). If C (cyan) (No in step #9), initialize the counter Ct2 (step #13), set the variable i to "0", step #14
), the state is set to "4" (step #15).

When processing in each state is completed, counters Ct+ and Ctt are incremented in step #5.

When the state is "2", latches LL, L2, L3
Set the coefficients 1 to 3 respectively.

Substitute Y+, Yx (step #21), counter C
Wait until t becomes (T1+91), that is, the coordinate y, which is the rear end of the mosaic monitor image CM.

Wait until it reaches the position (step #22) and set the state to "0" (step #23).

When the state is "3", substitute mi into coefficients 1 to 3 (step #24) and wait for counter CL2 to become 2, that is, wait for one block of the mosaic monitor to finish (step #25). , initialize the counter CL2 (step #26), and increment the variable i by one (step #27).

Next, wait until the rear end of the mosaic monitor image is reached (step #28), and set the state to "0" (step #29).

That is, here, coefficients 1 to 3 are set to the same value mi, and each time the mosaic monitor image changes by one block in the sub-scanning direction, coefficients 1 to 3 are set to a new value m(i
+1).

When the state is "4", substitute ci for coefficients 1 to 3 (Step #30), wait for the counter Ct2 to become (3N), that is, wait for one block of the mosaic monitor to finish (Step #30). 31), initialize the counter Ctz (step #32), and increment the variable i by one (step #33).

Next, wait until the rear end of the mosaic monitor image is reached (step #34), and set the state to "0" (step #35).

That is, here, coefficients 1 to 3 are set to the same value ci, and each time the mosaic monitor image changes by three blocks in the sub-scanning direction, coefficients 1 to 3 are set to a new value c(i
+1).・Through the above processing,
Various coefficients are set for each print color, and color adjustment is performed.

After the mosaic monitor image is formed on the paper P, when the operator selects the image with the most desirable color among them,
The coefficients corresponding to the image of that color are automatically set, and the entire image of the document is thereby copied.

Here, the color adjustment coefficients of the mosaic monitor image are stored in the CPU 26 corresponding to each block in FIG. 9, and when a block is selected, color adjustment is performed using the color adjustment coefficients of the selected block. Ru.

In order for the operator to specify an image selected from among the mosaic monitor image CM, for example, press the function keys 78 to 81 according to the message displayed on the display section 84.
All you have to do is operate the .

Alternatively, the image block shown in FIG. 9 is displayed on the display unit 84, and a coefficient is selected by selecting block coordinates using a function key or numeric keypad.

In the above embodiment, the mosaic monitor mode has been described, but it is also possible to set the mode to superimpose mode by switching the signals. This will be briefly explained below.

In the superimpose mode, it is registered in advance in the image RAM 403 (
This registered image is then printed at an arbitrary position on the paper P. Thereby, it is possible to perform overlapping printing on the paper P to form a composite image.

In the superimpose mode, the selector 401 selects "white" data, the selector 426 selects the selection signal generation circuit 425, and the selector 427 selects the latch signal from the CPU 26.

First, the operation of the monitor image memory circuit 201 shown in FIG. 4 in the superimpose mode will be described.

The registration of images in the image RAM M2O3 is exactly the same as in the mosaic monitor mode described above.

When reading from the image RAM 403, a value corresponding to the desired position 1 on the paper is set in the readout area determination circuit 408 by a readout area setting signal.

In this case, the output signal S9. of the read area determination circuit 408. Only when SIO are both enabled (“L”), the output of gate 411 becomes active, allowing image data from image RAM 2 O 3 to be transmitted to the subsequent stage.

When reading from the image RAM 403 is not performed, the selector 401 selects a normal image from the shading correction circuit 23 and transmits this to the subsequent stage.

Next, the color adjustment operation in the superimpose mode of the monitor image tone setting circuit 202 shown in FIG. 5 will be explained.

For the launches LL and L2 in the latch circuit 422, coefficients for normal copying or coefficients for superimposed area are set respectively.

At this time, the selector 427 transmits a latch signal from the CPU 26 to the latch circuit 422, and the input data (coefficients) of the latch circuit 422 are launched by this latch signal.

Further, the selector 427 selects the output of the selection signal generation circuit 425.

In this selection signal generation circuit 425, when the output of the inverter 412 is rH, that is, when the image RAM M2O3 is not in the read state, the selector 423 selects the latch L1, and when the image RAM 403 is in the read state, the selector 423 selects the latch L2. It is now possible to select.

Therefore, when printing the original image directly without storing it in the image RAM 403, color adjustment is performed by the coefficient set in the latch L1, and when reading and printing the image once stored in the image RAM 403, , color adjustment is performed by the coefficients set in latch L2.

Note that the set values of the latches L1 and L2 must be reset for each print color. This also applies to the mosaic monitor mode.

According to the above embodiment, in the mosaic monitor mode, when the attention area EA is set by operating the jitter dial 82 or 83 while looking at the display section 84, various different color corrections are performed on the attention area EA. A large number of mosaic monitor images GM are arranged and formed on the same paper P in one printing process.

The operator selects the image closest to the color of the original image or the image of the operator's favorite color from among the mosaic monitor images GM, and specifies it using the function keys 78 to 81 to select the image for the next copying operation. Color adjustment is performed, and thereby the color adjustment for the entire image of the document can be easily performed.

Therefore, copying for color adjustment only needs to be done once, so paper and color toner are not wasted, and time and labor for color adjustment can be reduced.

By setting the most important part in terms of color as the attention area EA in the image of the original document, it is possible to focus the color adjustment on such an important part.

Furthermore, by specifying an image selected from among the mosaic monitor images using function keys 78 to 81, the coefficients for color adjustment are automatically set.
This saves the effort of inputting coefficients numerically, and prevents coefficient setting errors.

In the embodiment described above, since the transfer drum 51 is provided, an image can be transferred onto the same sheet any number of times without separating the sheet from the transfer drum 51. Therefore, if the image output moving means in the main scanning direction and the sub-scanning direction and the image adjusting means are linked, the image R
Without using AM403, it is also possible to output a large number of images obtained by performing various color adjustments on images of specific areas of a document without overlapping each other on paper.

However, in this method, scanning is repeated by the number of color adjustments times the number of printed colors. For example, for an image of a specific area of 3C111 squares, 64 (=8X8
) is printed 256 times (
= 64x 4) will have to be scanned repeatedly,
It will take a lot of time.

〔Effect of the invention〕

According to the present invention, since copying for color correction is performed on the same sheet of paper, paper and color toner are not wasted, and time and labor for color adjustment can be reduced.

Furthermore, by selecting the most important part in terms of color from the original image and setting it as a specific area, it is possible to focus the color adjustment on such an important part.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention; FIG. 1 is a front view showing the overall configuration of the copying machine, FIG. 2 is a diagram showing the arrangement of various keys on the operation panel, and FIG. 3 is a diagram showing the configuration of the signal processing section. 4 is a circuit diagram of the monitor image memory circuit, FIG. 5 is a circuit diagram of the monitor image tone setting circuit, FIG. 6 is a timing chart showing the image data flow state, and FIG. 7 is a color adjustment diagram. FIG. 8 is an enlarged view of the display section, and FIG. 9 is a view showing an example of paper on which a mosaic monitor image is formed. 10...Scanner, 20...Signal processing unit, 26...
・CPU. 31... Print head section, 41... Photosensitive drum, 45a. 45 b, 45 c, 45 c... developing device,
51...Transfer drum, 78°79.80.81...
Function key, 82.83... Jog dial, 84... Display part, 201... Monitor image memory circuit, 202... Monitor image setting circuit, 403... Image RAM, 421... Multiplication 422... Launch circuit, P... Paper, EA... Attention area (specific area),
GM...Mosaic monitor image. Applicant Minolta Camera Co., Ltd. Agent Patent Attorney Yukio Kubo

Claims (1)

[Claims] (1) A means for setting a specific area in a document image, a means for performing color correction on the image in the specific area, and forming multiple images on which different color corrections have been performed at different positions on the same sheet. 1. A digital color copying machine comprising means for: