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A colour measuring device for measuring/comparing colours.
It is often used to calibrate monitors or in biology/chemistry for analyses. More sophisticated devices, such as the spectrophotometer, can measure colours spectrally and are also used for proofing to verify or calibrate printers.
The measured distance (colour difference) between two colours. The colour locations of the two colour values are displayed within a system and the difference is given in Delta-E.
Colour measurement is used to determine the exact colour location of a colour in a colour system.
Delta-E is a unit for the colour distance between two colours.