Raster Entity Manipulation

You can use Raster Entity Manipulation (REM) to edit raster entities in bitonal, color, and grayscale images.

For example, you can adjust the radius of a raster circle, remove some dimension lines on a mechanical drawing, or copy electrical symbols from one image to another.

You use REM commands to define raster entities as REM objects. After defining the REM objects, you can use either AutoCAD commands or AutoCAD Raster Design toolset commands to operate on the objects in the same way you work with vector objects. You can merge the modified raster data into the existing image or create a new image from the data.

Types of REM Objects

There are three types of REM objects:

• Region. Use a region object to select all of the pixels within the given geometry, whether or not the pixels make up individual raster entities. You can define region objects for all image types (bitonal image, grayscale image, and clipped image). A region can be rectangular, polygonal, diagonal, or circular.
• Enhanced Bitonal Region. On bitonal images, use an enhanced bitonal region to automatically select complete raster entities.
• Primitive. Use a primitive object to select individual raster lines, circles, or arcs. Primitives are more intelligent than regions and enhanced bitonal regions because their dimensions can be changed. For example, you can change the diameter of a circle and still have it maintain its original line width. You can also use grips or the Properties dialog box to change the dimensions of a primitive object. For more information, see AutoCAD Properties of REM Objects.