Method to convert an image to a CMYK color space and examine the intensities of one of the CMYK color channels.

方法将图像转换为CMYK颜色空间，并查看其中一个CMYK颜色通道的亮度。

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Set in the library on color gamut is very wide, more than the performance of the RGB color gamut, let alone CMYK color space, so, a large color department is to use CMYK printing ink can't present.

套色色库中的颜色色域很宽，超过了RGB的表现色域，更不用说CMYK颜色空间了，所以，有很大一部门颜色是用CMYK四色印刷油墨无法呈现的。

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