Datacolor Spyder3 Elite Help Manual page 62

Select Gray Balance Refinement
Help Index
Usual Setting
Most users will leave this setting at the default value which is 'off'.
The Purpose of This Step
Allows the user to indicate whether they want the calibration process to spend
additional time to see if the gray balance of the calibration can be improved.
The Long Answer
The normal calibration process is to measure the display, calculate the correction
curve and load that into the video card.
If Gray Balance Refinement is on then an additional step is performed following the
normal process. After the correction curve is loaded into the video card, the
application will then take readings to see how close the calibrated display is to the
desired target value. At points in the gray ramp the program will adjust the calibration
slightly and then measure the display again to see if the result is closer or farther from
the target.
This process will take several minutes as the application steps through the gray ramp
tweaking and re-measureing the calibration results.
The end result of this process may be better gray balance. Any improvement may be
at the expense of tonal response accuracy and/or gradient smoothness.
Further Information
For information such as a list of Frequently Asked Questions and details on all
Datacolor products be sure to visit our website: www.datacolor.com/Spyder3