The measurement of colour and the assessment of colour
differences are essential to meet the specifications agreeable
between the customer and the supplier. In the CIE system, the
total colour difference (ΔE*) combines the difference of 3
independent variables, namely: L*, a*, b*: The lightness
difference on the L* axis, expressed as ΔL*, the red-green
colour difference on the a* axis expressed by Δ a* and the
yellow-blue colour difference on the b* axis, expressed by Δb*.
The measurement of colour and the assessment of colourdifferences are essential to meet the specifications agreeablebetween the customer and the supplier. In the CIE system, thetotal colour difference (ΔE*) combines the difference of 3independent variables, namely: L*, a*, b*: The lightnessdifference on the L* axis, expressed as ΔL*, the red-greencolour difference on the a* axis expressed by Δ a* and theyellow-blue colour difference on the b* axis, expressed by Δb*.
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