EasyMatch QC User’s Manual Version 2.1
Measurement Values
A-3
where:
dL = L
SMP
- L
STD
(if + dL, sample is lighter than standard;
if - dL, sample is darker than standard.)
da = a
SMP
- a
STD
(if + da, sample is redder than standard;
if - da, sample is greener than standard.)
db = b
SMP
- b
STD
(if + db, sample is yellower than standard;
if - db, sample is bluer than standard.)
The dE derived from these opponent-color scales approximates the NBS Unit of Color Difference (Judd-
Hunter), which represents the average maximum difference acceptable in a series of dye-house
commercial matches in 1939.
The
CIE 1976 L*a*b* Scale
is recommended by the Commission Internationale de l’Eclairage (CIE).
It is a simplified cube root version of the Adams-Nickerson space produced by plotting the quantities of
L*a*b* in rectangular coordinates.
The relationship between the CIE L*a*b* scale and the CIE XYZ scale for any illuminant referenced in
ASTM E308 is as follows:
16
-
Y
Y
f
116
=
*
L
n
a * = 500 f
X
X
- f
Y
Y
n
n
b * = 200 f
Y
Y
- f
Z
Z
n
n
where:
3
n
n
X
X
X
X
f
=
if X/X
n
> (24/116)
3
(
)
116
16
+
X
X
108
841
=
X
X
f
n
n
if X/X
n
≤ (24/116)
3
3
n
n
Y
Y
Y
Y
f
=
if Y/Y
n
> (24/116)
3
(
)
116
16
+
Y
Y
108
841
=
Y
Y
f
n
n
if Y/Y
n
≤ (24/116)
3
Содержание EasyMatch QC
Страница 11: ...Part I Software Overview...
Страница 105: ...EasyMatch QC User s Manual Version 2 1 2 50 Lessons...
Страница 112: ...Part II Software Menu Commands...
Страница 140: ...EasyMatch QC User s Manual Version 2 1 3 28 The File Menu...
Страница 150: ...EasyMatch QC User s Manual Version 2 1 3 38 The File Menu...
Страница 156: ...EasyMatch QC User s Manual Version 2 1 5 2 The View Menu Toolbar is not displayed...
Страница 227: ...Part III Instruments...
Страница 290: ...Part IV Reference...
Страница 325: ...EasyMatch QC User s Manual Version 2 1 Measurement Values A 35...
