XYZ ⇋ LCh(u'v') 转换工具
支持 CIE 1931 XYZ 与 CIELCh(u'v') 之间的批量双向转换
XYZ 输入/输出
LCh(u'v') 输入/输出
计算公式
XYZ ⇋ Lu'v'
L* = 116 * f(Y/Yn) - 16
u' = 4X / (X + 15Y + 3Z)
v' = 9Y / (X + 15Y + 3Z)
Lu'v' ⇋ LCh(u'v')
u* = 13L*(u' - u'n)
v* = 13L*(v' - v'n)
C* = sqrt(u*² + v*²)
h = atan2(v*, u*)
f(t) 函数
f(t) = t^(1/3) (t > ε)
f(t) = (κ * t + 16) / 116 (t ≤ ε)
ε = (6/29)³