# Region

Use the Region tab to define the the area of the input image where the tool searches for edge points.

Parameter | Description
--- | ---
Region Mode | Defines the bounding box for the region: Pixel Aligned Bounding Box encloses the defined region within a rectangle, so features outside the defined region but within the bounding rectangle can be included in the results. Pixel Aligned Bounding Box Adjust Mask encloses the defined region within a rectangle but masks out the features that are outside the region but inside the enclosing rectangle.
Region Shape | The shape of the search region. By default the tool uses a RectangleAffine. The set of region-defining parameters depends on shape you select. Selecting None = Use Entire Image uses the entire Current.InputImage as the search region.
Selected Space Name | The coordinate space in which the copy region is interpreted. For more information, see the topic Coordinate Space Names.
Fit In Image | Centers the search region within Current.InputImage.