Autotek autocad raster design 2010 用户手册

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 Raster Design 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.

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 (

 (page 382), 

 (page 390), and 

 (page

383)). 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 

 (page 167).