colour.constants.cie Module

CIE Constants

Defines CIE constants.

colour.constants.cie.CIE_E = 0.008856451679035631

CIE \(\epsilon\) constant.

CIE_E : numeric

Notes

  • The original CIE value for \(\epsilon\) is \(\epsilon=0.008856\), Bruce Lindbloom has shown that this value is causing a discontinuity a 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

[1]http://brucelindbloom.com/index.html?LContinuity.html (Last accessed 24 February 2014)
colour.constants.cie.CIE_K = 903.2962962962963

CIE \(k\) constant.

CIE_K : numeric

Notes

  • The original CIE value for \(k\) is \(k=903.3\), Bruce Lindbloom has shown that this value is causing a discontinuity a 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: \(k=24389/27\).

References

[2]http://brucelindbloom.com/index.html?LContinuity.html (Last accessed 24 February 2014)