There is a unique set of colours that can be perceived by the human eye. These colours are called ‘luminous’ colours and are grouped together in the standard colourimetric system, with each lumi- nous colour being given x and y coordinates as chromacity coordinates. In addition, warm white (ww), neutral white (nw) and daylight white (dw) luminous colours have their own specified temperature value – a ‘colour temperature’ TF
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