Note: This site is currently "Under construction". I'm migrating to a new version of my site building software. Lots of things are in a state of disrepair as a result (for example, footnote links aren't working). It's all part of the process of building in public. Most things should still be readable though.

RGB Conversions

Code

//Reference-X, Y and Z refer to specific illuminants and observers.
//Common reference values are available below in this same page.

var_Ka = ( 175.0 / 198.04 ) * ( Reference-Y + Reference-X )
var_Kb = (  70.0 / 218.11 ) * ( Reference-Y + Reference-Z )

Hunter-L = 100.0 * sqrt( Y / Reference-Y )
Hunter-a = var_Ka * ( ( ( X / Reference-X ) - ( Y / Reference-Y ) ) / sqrt( Y / Reference-Y ) )
Hunter-b = var_Kb * ( ( ( Y / Reference-Y ) - ( Z / Reference-Z ) ) / sqrt( Y / Reference-Y ) )

via: