Autotek autocad raster design 2010 用户手册

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Define a REM region object when you want to work with the pixels inside the
specified area, such as the pixels within a polygon.

You can define the region using the Raster Entity Manipulation submenu on
the Image menu, the REM Regions toolbar, or the command line.

You can define the following region objects: polygon, rectangle, diagonal,
and circular. In addition, you can define a region object from an existing
vector object.

After you define a region object, you can edit it, then merge it into an existing
image, or create a new image from the region object.

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As shown in the following example, you can define a housing development
within an aerial photograph as a region object. You can then convert the
region object to a new image as a base for a street drawing.

168 | Chapter 7   Raster Entity Manipulation