Straighten Horizon

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Use this option to use a reference line inside the image to that you want to have straightened (leveled).

 

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Now drag a line over the area that you need to have straightened.Do that by clicking the start point and then, while holding down the left mouse button, drag a line to the end point.

 

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After releasing the mouse you will get the Free Rotate dialog where you can optionally make a change. The angle in the dialog is based on the selected area.

 

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Click <OK> to confirm the rotation.