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This filter rotates an image to straighten it. Rotation is limited to 20 degrees in either direction. This filter is intended for images of scanned documents that contain horizontal lines of text. Such lines are used as a guide when straightening the image. Images without these horizontal lines may be altered improperly.

This filter does not support 12, 16 or 32-bit grayscale images.

This filter does not support 48 or 64-bit color images.