HunterLab EasyMatch QC User Manual page 319

(
δ  ϕ
 
W sin +
 
 
Q = *
( )
δ ϕ
 

S cos
δ
 
 
W
 
 
C = W * - 1 -
δ
0
 
 
Y
Y, x, and y are the CIE Chromaticity Coordinates
ϕ = the hue preference in reference to the perpendicular to the reference dominant wavelength
(RWL) = 15°
η = the angle between the RWL and the x-axis of the chromaticity chart = 48.18154°
δ
W
= contribution of lightness to whiteness
= 1
δ
Y
δ
W
= 4000 = contribution of saturation to whiteness
δ
S
W = 100 = degree of whiteness of physical ideal white
0
X
n
x =
(
n
X + Y + Z
n n
Y
n
y =
(
n
X + Y + Z
n n
X = 94.81 (for D65/10°)
n
Y = 100 (for D65/10°)
n
Z = 107.33 (for D65/10°).
n
EasyMatch QC User's Manual Version 2.1
)
π 
 
= -3695.690 for UltraScan XE

= a similar value, optimized for each individual instrument for
ColorQuest XE, LabScan XE, UltraScan PRO, and UltraScan VIS
( ) ( )
P - Q = 1809.441 for UltraScan XE
X y
n n
= a similar value, optimized for each individual instrument
for ColorQuest XE, LabScan XE, UltraScan PRO, and
UltraScan VIS.
= 0.313795
)
n
= 0.330972
)
n
Measurement Values A-29