Defines CIE constants.
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) |
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) |