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Colour and its reproduction
It is essential to properly define the notion of colour. Matter itself does not have colour, it only has the property of reflecting certain light rays to which the eye is sensitive to a greater or les- ser degree. Colour is therefore the visual sensation perceived by the observer of an object under a given lighting.

Different factors are involved in the perception of colour:
•Light: light is an electromagnetic
wave, which can in particular be cha- racterised by its wavelength and the- refore its energy. It can considerably modify the perception of colour.

• Matter: matter has the property of reflecting luminous energy to a greater or lesser extent.

• The eye: the eye plays the role of converting the information it receives and transmitting it to the brain for interpretation. The human eye is sensitive to electromagnetic radiation with wavelengths between 400 and 700 nm (visible spectrum).
Colorimetry is the technical means of expressing a colour in mathematical terms so as to position it within a defi- ned space, calculating the differences between a standard and a sample, determining the acceptable colorime- tric tolerances and even making colour formulations.
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