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CMYK color? The excitement in the CMYK color scale

Màu CMYK là gì? Những kỳ thú trong thang màu CMYK  | kien thuc in an thiet ke  | thang màu màu sắc Màu CMYK in màu chất màu  | IDEA VINA.COM

Mixture of ideal CMY colors are excluded (the colors in the same spot on a white background will generate black). Principle work cuaCMYK is based on light absorption. Colors that we see is from the part of the light is not absorbed. In dark pink CMYK plus yellow to red, dark red plus blue for blue, blue plus yellow generates green and combinations of blue, dark red and yellow make black.
Because the color 'black' color produced by mixing original rule is not really like the black really black or absolute black body (the object absorbs all light), the printing on the basis of four colors (sometimes called in the color although this is incorrect) use black ink to add to the original rule are yellow, pink and dark blue.

Màu CMYK là gì? Những kỳ thú trong thang màu CMYK  | kien thuc in an thiet ke  | thang màu màu sắc Màu CMYK in màu chất màu  | IDEA VINA.COM

The use of four-color printing technology generates very high end printing results with high contrast levels. However, the color of objects that people see on a computer screen usually little difference to its color when printed because the CMYK color vaRGB models (used in computer monitors) with g different color. The RGB color model is a model based on the light emission (complementary colors), while the CMYK model works under the light absorption (eliminating color).
2. Why convert between RGB to CMYK color system?
The conversion of color data from RGB format to CMYK format is required to work printing device can produce acceptable print quality. This is because such a transformation is more likely to lose data on the color of a certain number of pixels by the color is outside the limits of the CMYK color gamut.

Màu CMYK là gì? Những kỳ thú trong thang màu CMYK  | kien thuc in an thiet ke  | thang màu màu sắc Màu CMYK in màu chất màu  | IDEA VINA.COM

3.How to convert from RGB to CMYK directly
To convert from RGB to CMYK, CMY intermediate values ​​are used. The quantitative values ​​of color are represented as vectors, with each color component in the period from 0 (no color) to 100 (saturated) with non-negative integer values ​​in CMYK-do system this system can be considered, in substance, is the saturation of color in terms of the percentage scale, and from 0 to 255 for CMY and RGB system:
tCMYK = {C, M, Y, K} is four CMYK element in the segment,
tCMY = {C ', M', Y '} is three CMY element in the segment,
tRGB = {R, G, B} is a three-element RGB stage.

Màu CMYK là gì? Những kỳ thú trong thang màu CMYK  | kien thuc in an thiet ke  | thang màu màu sắc Màu CMYK in màu chất màu  | IDEA VINA.COM

4. How to convert from RGB to CMYK indirect
Convert RGB to CMY, then moved CMY CMYK:
Switched: tRGB = {R, G, B}
Conversion to CMY: tCMY = {C ', M', Y '} = {(255 - R), (255-G), (255-B)}
The choice of K is relatively complex problem, it completely depends on the decision of the manufacturer printing device. The value of K is the manufacturer withheld as a trade secret. In most cases, the coefficient K is equal to 0 when the saturation of the black lower from 50% to 75% because it is assumed that under a reasonable level (completely subjective) does not need to be printed in black ink.
In theory it is acceptable K = min {C '/ 2.55, M' / 2.55, Y '/ 2.55}. (0 <= K <= 100)
and then converted to CMYK:
If K = 100, C = 0, M = 0, Y = 0 (all black).
If 100> K> 0, then: C = (C '/ 2.55 - K) * 100 / (100 - K), M = (M' / 2.55 - K) * 100 / (100 - K), Y = (Y '/ 2.55 - K) * 100 / (100 - K) and K = K in which the value of C, M, Y, K is rounded to the Resources section.
This is the ratio of the four color inks should be printed on the same location to create the necessary color.
5. Why do we need color correction system when switching from RGB to CMYK?
The color correction is necessary because the data on the device can switch to color printing in different formats such as RGB or CMYK. Since the current electronic printing equipment a CMYK device support, so all data transferred to the device color printing must be converted to dangCMYK so they can be used by the printing device to put acceptable prints. For example, the majority of commercial applications in general have to format the colors in the RGB system, but the graphics application like CorelDraw, Adobe PhotoShop, Adobe Illustrator ... In general formats colors in the CMYK values, but support RGB color mode. So fix different color modes can be used depending on the data source as well as print quality is expected.

Màu CMYK là gì? Những kỳ thú trong thang màu CMYK  | kien thuc in an thiet ke  | thang màu màu sắc Màu CMYK in màu chất màu  | IDEA VINA.COM

There are some settings to correct the color, creating a great deal of flexibility in choosing the form of repair color used to print some data. Namely: auto, incandescent, turn off, CMYK, display, black and white and color sketches 2

 

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