X-Rite 504 SpectroDensitometer Operator's Manual Page 72

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CHAPTER FIVE
5-18
ΔE Method
The instrument supports three tolerancing methods: CMC,
Lab, and CIE94. Displayed data automatically updates to the
selected method after you exit.
CMC- is an ellipsoidal tolerance method that attempts to
correlate small measured color differences with visual
assessment.
Lab - establishes constant limits for lightness, red/green, and
yellow/blue values. L*a*b* tolerance cause color difference to
be limited by a rectangular box in color space.
CIE94 - is similar to CMC ellipsoidal tolerance method.
However, calculations are based on L*C*h° data.
Observer Angle
The available viewer angles are: 2° and 10°. The 2° observer
is based on a commonly accepted description of the average
human viewer. If the field of view is larger than 2°, the 10°
observer should be used. Displayed data automatically updates
to the selected angle after you exit.
Illuminants
You can choose from several illuminant options for viewing
data. Displayed data automatically updates to the selected
illuminant after you exit. Available illuminants are: A, C, D50,
D55, D65, D75, F2, F7, F11, and F12.
Active Group
The Active Group option is used to select, create and delete
groups. A total of 10 groups can be created to store a total of
1,424 samples. A group name can consist of up to 20
characters.
To select a group:
1. With the Match Options menu displayed, press the
Tab Up key $ or Tab Down key @ to highlight
Active Group option.
2. Press the Enter key # to access editor.
3. Use the Tab keys $@ to move the highlight to the
desired group name and press the Enter key #.
The group selected will now become the active group
with references.
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