PR-655/670 User Manual
59
FIGURE 53 - L*U*V* SETUP SCREEN
Touch
Delta E Disabled
to
enable
color difference measurements if desired. If
Delta E
is enabled,
Select
under
the
Reference
column becomes activated. The Reference is the “Golden Sample” against which all subsequent
samples are compared for color difference calculations. Delta E (CIE
E*ab or
E*uv) calculates color difference
in the respective color systems using the following equations:
( ) ( ) ( )
2
2
2
*
*
*
*
b
a
L
ab
E
+
+
=
( ) ( ) ( )
2
2
2
*
*
*
*
v
u
L
uv
E
+
+
=
EQUATION 3 -
E*ab
EQUATION 4 -
E*uv
6.
To make a
Reference
or
Source
measurement:
In most cases, a
Source
or
Reference
measurement is a
Luminance
measurement. Therefore, the
instrument should be set up to perform this type of measurement.
In the case of a
Source
measurement, a diffuse reflectance standard, such as the Photo Research RS-3 or
SRS-3, is placed in the exact location of the measurement area of the device under test
–
for example
the face of a display. For making measurements of test samples, the reflectance standard is replaced by
the device under test without disturbing or changing the position of the measurement instrument (PR-
655 or PR-670) or the light source.
a.
Touch
Select
under the
Reference
or
Source
column. The following screen appears:
Содержание PHOTO RESEARCH SpectraScan PR-655
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Страница 25: ...PR 655 670 User Manual 9 FIGURE 10 SAMPLE EXTERNAL TRIGGER INPUT CIRCUIT DRIVERS...
Страница 106: ...PR 655 670 User Manual 90 FIGURE 87 USB POWER SCREEN Total power available Total power required...
Страница 159: ...PR 655 670 User Manual 143 PR 655 PR 670 OUTLINE DRAWINGS...
Страница 160: ...PR 655 670 User Manual 144...
