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What is the Difference between RGB and CMYK
Author: SA Printing Companies   Posted: 28 November 2012


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When designing artwork and other documents, you will come across the terms RGB and CMYK colour gamut. These terms refer to different colour spectrums and can be very confusing at first. You need to know what ‘audience’ you are designing for, a computer monitor uses the RGB colour spectrum while printers use the CMYK colour spectrum.

CMYK colour spectrum
The CMYK (Cyan, Magenta, Yellow, Black) colour model is a subtractive colour model used in colour printing. This model works by adding different ink on a white background – the ink reduces the light that would be reflected, thus subtracting brightness from white.

RGB colour spectrum
The RGB (Red, Green, Blue) colour model is a additive colour model used for artwork viewed on computer screens and digital devices. The model works by adding red, green and blue light to reproduce various other colours.

All desktop and professional printers use the CMYK model.  The four colours can be mixed together in varying amounts and produce thousands of different shades and hues on paper.  Mixing CMYK inks is very different from mixing RGB lights; if more lights are added to RGB it produces brighter colors where as adding more ink in CMYK produces darker colors. 

 

RGB vs CMYK
You can produce very bright and vivid colours with RGB that is impossible to reproduce using CMYK inks. It is important to convert your RGB creation to CMYK before printing.


RGB version for electronic devices


CMYK version for print

 



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