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This enum is implemented in FRE for Windows.
ScanRotationAngleEnum enumeration constants are used to set the image rotation angle (once the page has been scanned). 
typedef enum {
 SPRA_Rotation0,
 SPRA_Rotation90,
 SPRA_Rotation180,
 SPRA_Rotation270
} ScanRotationAngleEnum;

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Elements

NameDescription
SPRA\_Rotation0No rotation.
SPRA\_Rotation180The image to be rotated by 180 degrees.
SPRA\_Rotation270The image to be rotated by 270 degrees.
SPRA\_Rotation90The image to be rotated by 90 degrees.

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Used in

IScanSourceSettings::RotationAngle IScanSourceCapabilities::RotationAngles