Panning Over the Source Image
You can use click-and-drag techniques to easily create a rough path, and refine it with the X and Y Position parameters.
To pan over the source image, do one of the following:
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Using either Source Display mode or Target Display mode, click the
crosshair and drag it to a new location.
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Use the X and Y Position parameters.
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The Position parameters refer to the center of the field of view. A
Position of รก0, 0 centers the field of view over the center of the image.