colour.constants.CIE_E

colour.constants.CIE_E = 0.008856451679035631

CIE \(\epsilon\) constant.

CIE_E : numeric

Notes

• The original CIE value for \(\epsilon\) is \(\epsilon=0.008856\), Lindbloom (2003) has shown that this value is causing a discontinuity at the junction point of the two functions grafted together to create the Lightness \(L^*\) function.

  That discontinuity can be avoided by using the rational representation as follows: \(\epsilon=216\ /\ 24389\).

References

• [Lin03a]