虽然光波被纸张和油墨吸收算减色效应，但CMYK与RGB之间并不是简单的“255 - ?”的关系。CMYK的颜色是由纸张和油墨的物理性质决定的，所以CMYK的色彩空间是一个四维非线性的空间，无法与三维的平滑的RGB空间对应，自然没有映射公式。-While the light is absorbed by the paper and ink count subtractive effect, but between CMYK and RGB is not a simple " 255-?"　Relationship. CMYK color is determined by the physical properties of paper and ink, the CMYK four-dimensional color space is a non-linear space to correspond with the RGB three-dimensional space of smooth, natural formulas are not mapped.