印刷就是使用印版或其它方式将原稿上的图文信息转移到承印物上的工艺技术。印刷，其实就是一个颜色合成的过程。将黄色、品红、青色、黑色四种网点叠加到一张纸上，形成彩色图案。
Printing is the use of plates or other means to transfer thegraphic information on the original to the substrate by technology. Printing, in fact, is a color synthesis process. The yellow, magenta, cyan, black four kinds of dots superimposed on a piece of paper, forming a color pattern.
常见的几种颜色印刷包括CMYK、专色和RGB。
Several common color printing include CMYK, Spot color and RGB.
CMYK也称作印刷色彩模式，与RGB相反，CMYK是一种减色模式，是一种依靠反光的色彩模式。
Different from RGB, CMYK is a subtractive color mode that relies on reflective color modes.
CMY是3种印刷油墨名称的首字母：青色Cyan、品红色Magenta、黄色Yellow。而K取的是black最后一个字母，之所以不取首字母，是为了避免与蓝色(Blue)混淆。
CMY is the first letter of the three printing ink names: Cyan,Magenta, Yellow. In order to avoid confusion with the Blue, K took the black last letter.
CMYK是四色打印和印刷的基础，因此我们在最终输出作品时，都应该将图象转成CMYK模式。
It is the basis of four-color printing, so when we finally output the work, we would turn the image into CMYK mode.
专色是指在印刷时，不是通过印刷C，M，Y，K四色合成这种颜色，而是专门用一种特定的油墨来印刷该颜色。
Spot color refers to the printing, not by printing C, M, Y, K four-color synthesis of this color, but with a special ink to print the color.
RGB色彩模式是工业界的一种颜色标准，是通过对红(R)、绿(G)、蓝(B)三个颜色通道的变化以及它们相互之间的叠加来得到各式各样的颜色的。
Color mode is a color standard in the industry, which is obtained by the change of the three color channels of red (R), green (G) and blue (B) and their superposition with each other to get a variety of colors.
RGB即是代表红、绿、蓝三个通道的颜色，这个标准几乎包括了人类视力所能感知的所有颜色，是目前运用最广的颜色系统之一。
RGB is the color that represents the red, green and blue channels. This standard includes almost all the colors that human eyesight can perceive, is one of the most widely used color systems.
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