JPS60113241A - Color simulation device - Google Patents

Abstract

PURPOSE:To simulate an actual color electrooptically or vice versa when the color quantity of color ink is specified by plate density by using a color monitor device and a plate density value display means. CONSTITUTION:Color signals 16(Y-K) corresponding to the quantities of respective colors on printing paper are outputted from a color quantity setting means 10 capable of setting the color quantity of ink to an optional value between 0 and, what is called, solid painting, and inputted to matrix means 20 and 21. Those means convert each color quantity of ink into the intensity of each fluorescent color on a color CRT and are equipped with a superposition correcting means 30 and an ink color-television color converting means 40. A signal 16 for displaying a color on the color monitor device 50 by its output is converted by a color quantity-density converting means 70 into the density of each plate corresponding to an employed printing system and its density value is displayed on a display means 80.

Description

DETAILED DESCRIPTION OF THE INVENTION In printing, various colors are expressed by using a plurality of colors of ink and overprinting them on printing paper with different colors (ink per unit area). The expression that expresses how much color each color ink is printed on printing paper 1 differs depending on the printing method. For example, in the offset printing method, it is expressed in dot %, which is the area ratio of halftone dots on the 0-separation plate. It is normal and
In gravure printing, it is common to express the density of transmission on a separation plate. Hereinafter, in this specification, the color-〇 expressions generally adopted in the printing method of
Let it be k degrees.

By the way, when receiving a printing order, colors may be specified (e.g. yellow; Y percentage).

1 Zenta; M what%, Cyan; C what%, Black; what%
It is specified in dot %, as in . In this way, when each color is specified by plate density such as dot %, K.

There was no device that could easily show what a color actually was. Conversely, if you create a desirable color by appropriately adjusting the sensuality of each ink color, you can simply press the button to determine, for example, what dot percentage should be used for each color in order to print the created color. There was no known equipment.

This invention was made in view of the above circumstances, and the color amount of each ink was specified by dot % equal plate density.
I wonder what color that color actually looks like.
The present invention relates to an apparatus that performs pneumatic shimmy ratio, and on the contrary, it is possible to know the dot % equal plate density when printing a desired color based on a preferable color.

Hereinafter, the present invention will be explained in detail by way of examples.

In this embodiment, channel 1 is used for offset, expressed as a dot %, and channel 2 is used for gravure, expressed as a dot %, and channel 2 is used for gravure, expressed as a plate once, and the transmission a of the separated plate is expressed as a dot %.
It is set to appear in degrees.

As shown in Figure v Has a setting device. That is, since the ink generally used for color printing has four basic colors, KY, M, C, and Y, in this embodiment, four needle setting devices (11Y) (11M) are used for Y, JC, and C. ) (11C') (1110) This color number setting device 1 is a terminal variable resistor, whose input terminal is connected to the constant voltage 7, and the knob of each color quantity of the variable resistor. (12Y) (12M) (12C) (12
By rotating and adjusting K) (see FIG. 2), any color amount can be set. The color amount in this case is the color amount on the printing paper, and the color amount is 0 (zero > lk 0.7 V,
The solid color amount is set to 0■, and can be set to any value between them. In this way, each color amount setting device (1
From 1Y) (11M) (11C) (11K) to the color signal (16Y) (1(S) corresponding to the amount of each color on the printing paper
M) (16C) (16K) will be issued. These color quantity signals (16Y), (16M), (16C), and (16K) are input manually to matrix means 12111+211 and color quantity -jd1 degree conversion means 4.

The matrix means (2) shows the color amount of each ink on the printing paper as described above, and the color amount of TV staff red; R, green: G, blue; B (on a color CRT) when viewed from the printing paper. As shown in Figure 1, it is equipped with an overlay correction means (body and ink color - TV color conversion means 140 'l'). When multiple colors of ink are overprinted on printing paper, the color amount of the printed ink does not necessarily appear additively, but appears as a slight decrease in coverage, and in areas where there are many overprinted inks, the color amount decreases. appears to be greatly reduced.

This is a means for performing supplementary IE (trapping correction) for this purpose. Such amendments are described in detail in Japanese Patent Publication No. 54-38921 and Japanese Patent Publication No. 54-38922 filed by the same applicant, so a detailed explanation will be omitted.

The circuit described in Japanese Patent Publication No. Sho 54-58922 is employed as the overlay compensation 113 means Cη in this embodiment.

In addition, the ink color-TV color conversion means (4 old, Y, which is the ink color, !(, C, & R, G, which is the five primary colors of TV)
, BtC color matrix conversion means, and this conversion means is described in U.S.P. 3131252, U.S.

Pya W125666, U, S, PA3128335. Since the isobaric system is disclosed in Japanese Unexamined Patent Application Publication No. 49-40819, detailed explanation will be omitted.

Note that the ink overlay correction means and the ink color-to-TV color conversion means do not need to be constructed as separate circuits.
27 and Japanese Patent Application Laid-open No. 56-167028, a calculation circuit that performs two types of calculations at the same time may be used, and furthermore, all of the above are examples of using an analog computer. but.

A digital computer may also be used.

Here, such matrix means r! In iJ.

If the printing method is different, the correction coefficient of the overlay correction means (field) will be different, and if the ink color is different, the Qi conversion coefficient of the ink color-TV color conversion means 1411 will be different.

Therefore, in this embodiment, two matrix means α)12+1& are provided depending on the marking method and the type of ink, and the selection can be made by means of the method selection means -i1'lV (by the changeover switch 61). The matrix means 121) has the same circuit configuration as the matrix means 1, and the correction coefficients of each means +1qll flNll' are adjusted to different values.

In this embodiment, the IT terminal matrix means is equipped with a 21-bit analog computer, which can be switched by a switch, but in particular, when printing methods of multiple IB types are to be simulated, a digital JT computer may be used. It is more advantageous to adopt it.

In this way, the matrix means Cz1 group or (21)
The five primary color signals (51R) of the color television system obtained in
1G) (51B) is manually inputted to the color CRT & color monitor device +jll, and this color monitor device 5
The three primary color signals (51R) (51
G) The color is displayed based on (51B).

In this way, the print color of the color set by the color amount setting means in the printing tdll method selected by the method selection means 11111 is displayed on the color monitor device cillK.

The other color signal (16Y) (16M) (16C) (16K) outputted by the color setting means (101) is input to the revenge-dA!f conversion means +711, and the conversion means +
11 values of each plate adopted in the printing method to be simulated in yct*. That is, in the case of the offset printing method, as mentioned above, the dot %, which is the halftone dot percentage in the separated plate-H, is used as the plate ill If, so the color tg (16Y) (16M) of each color is used.
(16C) (16K) is converted into a digital signal (for example, 0 to 0.7 V to a digital value of 0 to 10 units) by the analog-to-digital converter (71Y) (71M) (71C) (7110) for each color amount. 1 is inputted to a color amount-to-density converter decoy and converted into a corresponding dot % value, and the value is output as a digital conversion signal (76Y) (76M) (76C) (76K).

The converter of the lust-concentration converting means (l() is composed of a so-called microcomputer. Such a converter 3
Various conversion formulas are stored in advance for each method,
The printing method selected by the method selection means 6 ( 16Y)(16?1()(16C)(16
K) with the dark IW signal (76
Y) (76M) (76C) (76K).

An example of a conversion formula for such calculation is shown in FIG. The wrapping signal for the number Y shown in the same figure is the t color conversion formula for converting to dot % in the offset printing method.
fI As mentioned above, in this embodiment, the input signal 100 corresponds to the color zero, and the input signal No. 13 zero corresponds to the new line Beta-II.

In addition, in this implementation 1 @ (in this case, the method that can be selected by the method selection means I is 2ft (2 channels), and the method is different for each channel), the IJ Fuchs stage and conversion formula are adopted, and the above-mentioned (Channel 1 is set for offset and channel 2 is set for gravure, but both channels may be used for offset or gravure, and the number of channels may be increased as necessary. For example, the same offset mark ti11 However, the reflectance of ink differs depending on the printing paper used, and if paper with poor reflectance (wood-free paper, newsprint, etc.) is used to print the same amount of color, the plate must be made with a larger dot percentage. Therefore, even in such a case, the number of channels that can be selected by the method selection means must be increased, and even if the same matrix 0 (l) is used, the color amount-density conversion means CII can select a different conversion formula. You may try to get it.

Figure 4 shows the amount of color -! 111f converter U3 is shown. Here, C&-2(716), CAT,-
a (746), CAL-6 (756), CAL
-8(766'>, is Y for channel 1.

This is a step of calculating the dot % plate density of the negative for offset from each of the M, C, and M colors (0=peta color reproduction, 100=zero color ejection). Also CAL-1 (71s
), CAL-3 (745), CAL-s (7ss).

CAL-7 (765) is Y, M, C for channel 2.

This is a calculation step to calculate the dot percentage of a gravure negative from K's lust. CAL-1o (72s) is a calculation step for converting negative dot % to positive dot %. (IL-9 (725) is a calculation step that calculates the negative transmission density from the negative dot %.
11 (727) is a calculation step for calculating the positive transmission density from the negative transmission degree. In each calculation step, a conversion formula is stored in advance, and the conversion calculation is performed based on this stored conversion formula.

First, start the program with Start (701).

In the initial set (702), check whether the channel selected by the method selection means is channel 1 or 2, check whether the plate density expression in each channel is dot % or density, and check whether the negative/positive switch is set to negative. Check whether it is positive or not, and then perform initial settings such as clearing each memory.

Next, input the values of Y & M, C, with the YMCK input (703), and check whether the Y value input with the primary Y2 Y' (710) matches the value stored in the memory Y'. In the case of /I6, (at least initially it will be received since the memory Y' is initialized to a value other than 0 to 100) Y'←Y (711) was input to the memo Q -Y'. The value is stored and the value of memory B is set to y in the first order B←y (712).

Next, the channel l selected on CH-1 (714)
! 1lt1 or not, and if it is channel 1, C
AL-2 (71S) performs the conversion operation shown in FIG. 3 on the value stored in memory Y'lC, and
``IQT% (720) determines whether the expression of plate density is dot % or not, and if Yes, the next negative (722) determines whether the negative/positive switch is negative/positive, and if it is negative, N
←In the calculation result (72B), store the calculation result of Y in memory A. Memo II in the next B='i” (729)
-H is judged, and if memory 〇 is y, memory 〇 is y in CAtl description B4-V (712). )
At the next y′←Ar730), the memo IJ − is stored in the memory y′.
Store the calculation results stored in A.

Next, proceed to M = M' (740).

For negative (722) and positive, -CAL-1o (7
In step 2s), an operation is performed on the IFMFC to convert the negative dot % to the positive dot %, and then the process proceeds to the calculation end (72B).

In addition, if channel 2 is selected here, CH
-1 (714) goes to CAL-1 (715), conversion calculation for 2 channels is performed, and the 0th order dot% (720)
Then, the process proceeds to CAL-9 (725), and the calculation is performed to convert the negative dot % to the degree of creation of the negative with respect to the value of Y. At the 0th order negative (726), the negative/positive switch or the highest negative/positive is determined, and the negative In the case of , keep A ← Storage result (728)
If it is positive, use CAL-11 (727') to convert the negative to positive conversion wave Pγ to f & A.
+ Proceed to #l calculation result (728).

The value of r-■ input at M-=M' (7o entry) is compared with the value of memory M', and since they do not match at first, m'4- is determined by the same steps as in the case of Y below M'. A
(731) Proceed to C=C''(750'').

Furthermore, the same applies to C6.

In this way, the memories y'6m', c', k'K
Y.

After the calculation results of each plate density for M, C, and M are stored.

Proceed to the output y'm'c' (770), and in this step (yyo), YoM, C0, once each color plate [W result is output to the output display means -, then set change (771
) to determine whether there is a change in the initial set data.

If there is no set change, proceed to input to YMC' (703) and input the values of Y, M, C, and so on.

Then, the newly input Y value at the next Y-Y' (yla) is compared with the previous Y value stored in the memo IJ-Y', and if they are the same, the set change (713 ).

Proceed to M=M' (740), and if different, repeat the same step of licking the Y plate 111 times as described above, and then proceed to M=M' (y a o ).

If there is a set change, the process proceeds from the set change (771) to the initial set (702), and then to the YMCK input (703) and Y=Y/(71o).

Here, if Y = Y/, set change (713), B
Proceed as ←y (712), and in the case of Y-Y', proceed as Y/←Y (
711) and B+y (712) to enter a routine in which the plate density of Y is calculated. Similarly, when there is a set change, the version a degree of M%C% is calculated again.

As mentioned above, the color amount-once converting means 17 (unusual) converts digital density signals (76Y) (76M) (76C) (76K) into signals corresponding to plate density according to each method and outputs them.
) are input to the display means (a) consisting of an LED digital display device, and the display devices (83Y) (83M
) (83C) (83K) and the corresponding numerical values are displayed.

In this way, the color setting method m1l in the printing method selected by the method selection means 111 (the value for each plate, such as the dosit% of each color amount set in 11) is displayed on the display means 1. Ru.

When using the apparatus according to the present invention, the supplementary I of the matrix means 1211+211 is selected according to the printing method corresponding to each channel selected in advance by the method selection means ++1.
The F coefficient and the color number-density conversion means (/l conversion formula are set in advance.

When simulating a color based on the plate density value, first select the printing method using the switch 61) of the method selection means, and display each color using the display device (ssY) (s;
MOesc) rsxK) While looking at the eroticism adjustment knob (
12Y) (12M) (12C) (12K) and set the displayed value to the specified value.

As a result, the display screen (to) button of the color monitor device tIA is displayed with the color htiJl when printing is performed with the set plate density.

In addition, when obtaining the plate 4 degree value for printing that color from a preferred color, first select the method using the method selection means, and then set the color amount without looking at the display screen 69 of the color monitor device CALL. Knobs for (12Yl (12M) (12C) (
12I() rotation, and a desirable color is projected on the display surface ζ+'3. Then, when the desired color is selected, the plate density value when expressing the seven colors by printing is displayed on the display device (83Y) for each color.
) (83M) (83C) (85K).

Since the present invention has the above configuration, it has excellent practical effects as shown below.

In other words, in the past, when a color was specified by plate density such as dot %, there was no suitable device that could show what kind of color that color would be printed. Printed colors can be displayed quickly and at almost no cost.

Conversely, if a desired color is created by adjusting the amounts of each of Y, M, C, and K, it is also possible to know the plate density for printing that color.

Furthermore, since it is equipped with a negative/positive conversion calculation means, you can easily know whether it is a negative value or a positive value by switching the switch, making this color simulation device extremely superior in printing plate making. It has practical effects.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a block diagram of the present color simulation device, FIG. 2 is a perspective view of the present color simulation device ft, and FIG. 3 is a color quantity diagram.
FIG. 4 is a graph showing an example of the conversion formula of the i degree converter, and is a flowchart of the color amount-to-density converter.

Claims (1)

[Claims] 1) Color amount setting means for adjusting the color amount of YMCK ink; matrix means for converting the color amount signal obtained by the means into three primary color signals of the color 'vv system; A color monitor device that displays actual colors using primary color signals, a color amount-density converter that converts the color amount signal into a corresponding plate density, and one of the means includes negative and positive conversion selected by a switch. 1. A color simulation apparatus characterized by comprising a calculation means and a display means for displaying a plate density value based on a density signal obtained by a color amount-density conversion means.