Why Do Colours on the Proofs Look Different to What is on my Screen?
CMYK vs RGB
CMYK colour mode is used for printing, and RGB is used for web or screen.
RGB is an additive colour system which means that the primary colours of Red, Green and Blue are added together in various combinations to produce a much wider spectrum of colours. These colours are produced by blending light itself by superimposing the red, green, and blue light beam. Without any intensity, each of those colours will be perceived as black, while full intensity will make them appear white. Differing intensities of each colour create the hue of a colour.
Unlike the RGB colour system, CMYK is a subtractive colour model because the printed ink reduces the light that would normally be reflected. The inks used subtract the brightness from a white background from those four colours. The range of colours and the vividness of those colours available with RGB is much greater than CMYK. Some colours that can be created onscreen are impossible to recreate using printing inks.
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