To Define Control Points
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In the Warp tool dialog, click Control.
The Control Point dialog displays to allow the user to define successive pairs of source and target points.
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Select the Source button, identify the source location with the mouse, then select the Target button and identify the target point.
The source and target fields will be filled in with the coordinates from the selected points. Alternatively, key in actual X and Y values for each field.
- If desired, enter a weight for the control point in the final field.
- Select Insert to add the control point pair to the dialog.
- When all the control points are entered, save the information as a CTL file for later use by selecting File > Save.