[WM]: rgb to cmyk

[zhoujifeng1980 <zhoujifeng1980@sina.com>]

Dear all,
   I want to convert the image from rgb colorscape to cmyk colorspace. Should i convert directly or first convert the image frm rgb
to cielab and then convert from cielab to cmyk? What's the different between the above two methods? 
Thanks,
zjf


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