Doubts about CMYK printing, what is the CMYK standard value of black in printing?

Isn't it transparent when it is printed on a non-white background? ”

I think the landlord's main question is here.

Let me explain, of course, I didn't study image processing, but I just learned some related things, and I really hope to help you!

First of all, when we were very young, we only knew seven colors such as red, orange, yellow, green, blue, purple, etc., and then, we had 12 colors of colored pens Later, the mobile phone had 256 color screens, 4096 color screens, 65000 color screens, and even now there are 16700000 color screens, we wondered, where did so many colors come from?

Actually, it's like this, or ask the landlord to think about it for himself, is the white of snow the same as the white of cotton? Is it the same as the white of white paper? It's all white, but if you compare, you'll find that it's the same white, it's not the same, that is, they're not the same white For example, you can divide the limit of white (that is, it can't be white anymore) to the limit of black into many points (I found you a diagram to illustrate:

Please note that the speed does not seem to be very fast.

That is, the color scale is divided. The whitest white, there will indeed be no pigment when printing, that is, the situation that the landlord said, but not all white is the whitest, so these "white" will be depicted with some pigments. (To add here, if for black and white, this white is instead depicted in black.)

For example, if the previous black-and-white TV set was only two colors, black and white, how would you look at it?! It's obviously different in black and white.

I wonder if my landlord can understand? But I'm really trying to make you understand, hehe, if it doesn't meet your needs, please forgive me!

The three primary colors can't be adjusted to white in the printing pigment, as for why I just don't understand, there is a special white pigment, if the printing is transparent.

c：75；y：67；m：68；k：90。

CMYK four-color superimposed black, looks very black, (but the effect of printing is not very ideal) is generally used for large-area printing, not rent Zibi is suitable for text printing. A lot of large-area black monitors look black, but the printing is not black enough, a little gray, that is because the designer uses a single black when designing black, the color value: C0 M0 Y0 K100, so there will be such a problem.

It is recommended that the full version has a large area of black, and the four-color black value should not exceed 250 (CMYK color value), and the printed black is relatively full and heavy. The color value is greater than 250, for heavy black, printing will appear that the paper can not hang the ink, easy to stick, there are words in it will be printed out of ghosting, affecting the printing effect, this color is not advocated in printing.

CMYK color is poor.

If it is possible to print with 100% pure and accurate CMY ink, you should be able to get an image that is exactly the same as in RGB mode. But this is not possible in production, so using CMY may result like the one on the left side of the image above, where the color of the image will be changed (and may vary depending on your monitor).

It's not that the RGB mode displayed by the monitor is accurate, but the difference in accuracy of the ink is much less problematic than the difference in the accuracy of the ink. It's almost impossible to achieve 100% RGB accuracy for a display, unless you directly use the laser as vision**. In other words, the RGB patterns that you can see with the naked eye are all impure, such as a certain percentage of blue and green in red.

This impurity is even more acute with ink, especially if you want to hit black with CMY. It is for this reason that a black color is often added to the CMY during printing to block the additional reflections caused by impure colors. This can largely repair the problems caused by impure colors.

The value of the cmyk of the fake gold can be the only value and can be adjusted according to the actual situation, and the common ranges are:

1、c=25，m=35，y=85，k=0；

2、c=10，m=20，y=95，k=5；

3、c=10，m=40，y=50，k=10；

4、c=20，m=40，y=50，k10；

5、c=30，m=40，y=90，k=0。

Four-color printing with fake gold divided into green gold and red gold, there are many kinds of gold values, reddish, yellow jujubes, saturation is different, there are more mixed color gold, there are ** yellow, red gold and bronze gold.

The printing color of fake gold should be adjusted according to the brightness of the fake gold to adjust the value of C and M, and some black can also be added appropriately for darker ones. Generally, black can not be greater than 30, preferably greater than 30, otherwise the color will be gray, and the effect of fake gold cannot be achieved.

That's right, if the logo is to be used for printing, it can also be CMYK, and if it is displayed on a computer and other display devices, it is good to use RGB.

CMYK is the printing mode, and as the name suggests, it is used for printing; RGB is the screen display mode, and most of the current displays use the RGB color standard.

CMYK is very different from RGB: RGB mode is a glowing color mode, and you can still see the content on Zheng Pei's screen in a dark room.

The printing is CMYK four-digging stool color printing, and the industry standard name is stool scattering: green magenta, yellow and black, all of which have original inks.

Theoretically, all the colors you want can be printed from these four primary color inks; However, some special colors, such as large color blocks, if you use four colors to overprint, there may be more problems, then, when printing, you will first tune out this color, and use a unit to print this color, the color of this jujube orange in advance is different from the beginning of CMYK, that is, spot color, and there are many original inks that have been adjusted, such as gold, silver and so on.

I don't know if the red you are talking about is the magenta of the four primary colors, or other spot colors, there are many of them.

CMYK belongs to the image mode.

c. Cyan, magenta, y, yellow, k, black.

In the CMYK image model, it theoretically belongs to the pigment subtractive method, which is mostly used in the printing field, and the color is described as a percentage, which is equivalent to whether the color is completely colored on the substrate.

The CMY was theoretically 100% colored, and the color formed was black, but due to the incompleteness of black, K was introduced

C+M=B(Blue) M+Y=R(Red) Y+C=G(Green).

CMYK, also known as the Printing Color Mode, is used for printing as the name suggests.

1] It's very different from RGB: RGB mode is a glowing color mode that allows you to see what's on the screen in a dark room; CMYK is a reflective color mode, so how do we read the content of a newspaper? It is the sunlight or light that hits the newspaper and reflects it into our eyes to see the content.

It needs to have an outside light source, so you can't read the newspaper if you're in a dark room. As long as the image is displayed on the screen, it is represented in RGB mode. As long as the image is seen on the printed matter, it is represented by CMYK mode.

For example, periodicals, magazines, newspapers, posters, etc., are all printed, so it is the CMYK model.

Can be used, generally speaking, are the use of monochrome, from 5% to 100% of black, but pure black also has disadvantages, that is, the color is not rich enough, easy to imitate, four-color printing depends on the situation, text and frame line, dotted line generally use solid color black, and packaging, shading, trademarks, etc. sometimes use standard color, at this time you can use CMYK four colors, that is, you can achieve a special color effect, and it is not easy to imitate, but if you use it badly, it is easy to appear slightly biased.

In practical application, it still depends on the situation, the translation should follow the primary color of the sample, and the design can be selected at will with the appropriate color, and if it is a printing or typesetting department, then do not change the original manuscript casually, which involves the contract and the quality of the printed matter responsibility problem, the general printing house is unwilling to revise the manuscript is the reason.

Printing is not commonly used gray, generally spot color or CMYK mixed color, black to be converted to K value pure black, black less than 5% can not be printed, I don't know what kind of situation you are talking about...

Any color can be printed, if you use CMYK four-color composed of gray, it is better to use a single black dot directly, the effect is the same, and it saves money.

Yes, but CMKY four-color gray is different from Y monochrome gray color, and the four-color gray is not gray at all, no matter which color is heavier, so it is necessary to use K single gray to not change color.

Yes, but the quality is not easy to control, and it is easy to cast color.

Generally, the k-value single ash is used.

The drawings that need to be printed are worth using CMYK colors.