Tips & Concepts Color Conversion
Color is basically formed by three-dimensional, so-called "color space". For representing 3-dimensional color formation is required 3-axis, can be RGB, CMY, Lab, HLS, etc.. The ability to see eye to have the largest color gamut and RGB and CMY smaller smaller so when converting to RGB and CMY color will look a bit dull (read: look at the monitor).
But there is in CMY warna2 that can not be accurately represented by the RGB color such as yellow 100%, 100% cyan and magenta 100%. Instead there are enough warna2 RGB WILL NOT been shown to accurately such as purple, green lights, etc..
CMYK vs. RGB
CMY, or CMYK color model is penintaan (substractive color mode), the primary warna2 (Cyan, Magenta, Yellow, Black) depending on the pigment in the ink and the printed substrate. For the record, and the printer prints only the "output devices".
RGB is the color of the lighting model (additive color mode) is used for "input devices" such as scanners and "output devices" such as display monitors, warna2 primary (Red, Blue, Green) depending on the technology tools used such as CCD or PMT on a scanner or digital camera, CRT or LCD monitors on display.
Both CMYK and RGB color model is not "independent", meaning that depending on the CMYK printing process, pigment, while the substrate and the RGB depends on the capacity of technological equipment used; means that we have the color data R 180, then on 2 different monitors we get different perceptions anyway, because it is very difficult to stimulate two different monitors - especially if the different technologies used.
Because the use of RGB is usually controlled by the appliance manufacturer, it is relatively easier for the team's research and development of the tool manufacturer to improve the ability of the instrument in order to achieve high quality with low tolerance.
As with the CMYK color model, especially for conventional printing, the ink is manufactured and printed by the printing ink used across various kinds of paper. The color reproduction process performed by a variety of parameters, and the results are taken anywhere for evaluation, often under conditions of varying illumination - problems metameri - giving rise to a lot of disagreement.
UCR vs GCR
Theoretically, combining the colors red, green and blue in equal amounts will produce abu2 neutral, so the 50% red, green and blue 50% 50% can be replaced only by a 50% black ink. Photoshop knows UCR (Under Color Removal) and GCR (Gray Component Replacement), meaning the UCR only shadow colors are replaced by black ink, while the GCR since the gray is replaced by black ink. Photoshop default is Medium GCR.
UCR and GCR used by Photoshop as a parameter when we want to convert RGB to CMYK. Learn more about the use of UCR and CGR depends on the print, so we get the parameters that best fit the mold.
I have a trick to convert an image with two kinds of the conversion process: (1) I usually select black text and convert to CMYK to Black Maximum, and (2) the Black is our "merge" into the other image conversion, so the text will appear 100 % K overprint, not perforated. Just keep in mind the GCR calculations do not apply 50% C + 50% M + 50% Y = gray, here Photoshop uses inks international standard parameters (ISO, etc..). Therefore, when the ink we use is not standard, then the conversion of RGB to CMYK into a crowded issue. In other words, no single solution that can solve these problems, considering many factors not measured or standards.
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