Datacolor Spyder3 Elite Help Manual page 34

Measured Luminance Mode
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The Long Answer
The Measured Luminance Mode feature allows you to use your Spyder to measure the
Black Luminance and White Luminance values of your display during calibration. This
can allow more consistent setting of the Luminance Values than using Visual
Luminance Mode.
Since each display is different, an initial calibration must be performed in Visual Mode
to determine the appropriate Black Luminance and White Luminance values for
your system.
If you select Measured Luminance Mode before a Visual Mode calibration has been
performed, the first time you calibrate you will be notified that a Visual Mode
calibration will be performed. Successive calibrations will then run in Measured Mode
using the appropriate values for your display.
If you select a different White Point then you will again be notified that a Visual Mode
calibration will be performed. The White Point can affect the White Luminance
value.
If you have specific Luminance Values that you want to use for calibration, you can
enter them into the Luminance fields after setting the Luminance Mode to Measured.
You might have specific Luminance Values if you are matching multiple displays. Your
system administrator may also require specific Luminance Values.
You can also create a Target File than includes the desired Black Luminance and
White Luminance values along with the White Point and Curve. A Target File is
created by selecting Save Target... in the File menu. The Target File will then
appear in the Target menu in the Select Target screen.
Further Information