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Imaging professionals must deal with all these things, and compensate for them. Textured paper will also affect the appearance of the color. Also, color inks are not opaque, so if the paper is not white, the color will be tinted by the paper. Imaging professionals use very high-end monitors and a variety of calibration tools to try to minimize this factor.ДЄnother major factor: colors will simply look different when printed, often due to the type of paper being used - matte, semi-gloss, high gloss, etc. The first is that computer monitors usually have poor color calibration. I say 'approximate' because there are several factors to consider when going from screen to printed material. With this equation, you are able to approximate the RGB color you see on your screen with what the color will look like when it is printed. Note that this equation assumes that the RGB values have been normalized - i.e., that they are between 0 and 1.0. One standard equation that is used to convert RGB to CMYK is: Often a company will want to match its web site layout and colors to its corporate logo, and to its use of colors in printed material. Black was added to the CMYK color space as 'K' to avoid confusing a 'B' with blue or brown. Black ink is also cheaper than the other three inks, so that printers will adjust the colors until the lowest-cost combination is achieved. The fourth color (black) was added to the CMYK color space because in printing it gives a purer form of black than the other three colors. So up to 100 x 100 x 100, or 1,000,000 different colors may be represented in the CMYK color space (black is used to lighten or darken the color). In the CMYK color space, the values for each of the colors are typically shown as percentages, from 0 to 100.

So you could increase the red either by increasing the magenta and yellow, or by decreasing the cyan. CMYK is called subtractive because its primary colors are subtracted from white light to produce the resulting color: cyan absorbs red, magenta absorbs green, and yellow absorbs blue. It is the complement of the RGB color space - cyan, magenta, and yellow are the complements of red, green, and blue, respectively. CMYKД¬MYK by contrast is a subtractive color space. This shows that when you have an RGB value of (255,255,255), you will get white. It also means that 255 x 255 x 255, or 16,777,216 different colors may be represented in the RGB color space. This representation lends itself to easy manipulation by computer systems in a hex notation. Each of the component colors is represented by a number from 0 to 255. RGB is an additive color space - that is, its three primary colors (red, green, and blue) combine additively to produce any desired colors. In the computer industry, RGB has become the de facto standard for both desktop applications and web-based systems.

There are different reasons for using different color spaces, and any google search will produce many results for further study. Among the color spaces currently in use, the RGB and CMYK spaces are encountered very frequently: RGB, because it is used in color monitors and CMYK, because it is used for printing. Public static float rgbToCmyk(float.A color space is a way of representing colors and how they relate to one another. Once you have the color profiles something like the following would do the job: import ДЇinal static String pathToCMYKProfile = 'C:\UncoatedFOGRA29.icc'

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Adobe has some ICC color profiles available for download 1, but I'm not sure how they are licensed. As Lea Verou said you should make use of color space information because there isn't an algorithm to map from RGB to CMYK.

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