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CMYK files are bigger than RGB files, but don't allow for any more colours. So why use them?
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CMYK stands for Cyan, Magenta, Yellow and blacK. These are the four colours of ink that printers mix to make every colour in the spectrum.
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| Luminous RGB Colours. | CMYK attempt to render those colours. |
CMYK files have a separate, adjustable channel for each of these inks, which makes it possible to precisely control how a file will print. Another drawback of RGB is that it can produce luminous colours which don't reproduce in CMYK printing, so you can get a nasty surprise if you use RGB files for print work.
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