Understanding the difference between RGB and CMYK

All of us see examples of RGB and CMYK every day. Check your emails on your computer and you will see RGB images. Read a magazine and you will see CMYK images. So what do they mean?
These are called colour models. RGB is an acronym for Red, Green and Blue, CMYK is an acronym for Cyan, Magenta, Yellow and Black ('B' could be confused for blue, so 'K' is used for Black). Computer screens, tablets, newspapers, magazines etc., manipulate light in different ways.
A computer screen uses RGB which is additive: it transmits a colour with variable rates of red, green and blue light. We see this as the colours on the computer screen.
A magazine uses CMYK which is subtractive: these are printed on the page and absorb and reflect light. We see the colours that are reflected from the page.
RGB or CMYK images are prepared in image editing software such as Photoshop. Images for printing should be 300dpi CMYK, whereas images for the internet should be 72dpi RGB.

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