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GdPictureImaging.TwainGetGamma Method
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Asks to the opened source for current Gamma correction value to apply to the scanned image.

C#
public Double TwainGetGamma();
Visual Basic
Public Function TwainGetGamma() As Double
Returns

Gamma correction value for the image data.

Remarks

Before using this function check that the TWAIN state is TWAIN_SOURCE_OPEN (4) 

To get the TWAIN state, use the TwainGetState() function.

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