Returns the number of available contrast values which can be used by the opened source in its current configuration.
public int TwainGetAvailableContrastCount();
Public Function TwainGetAvailableContrastCount() As Integer
If Success, non zero: The number of available contrast values. Else 0 if fail -> Use TwainGetLastResultCode() and TwainGetLastConditionCode() functions for diagnosing the error.
Before using this function check that the TWAIN state is >= 4 (TWAIN_SOURCE_OPEN)
To get the TWAIN state, use the TwainGetState() function.
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