Autotek autocad raster design 2010 用户手册

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Adjacent images: One image is tiled next to another, and the geometry for
the REM object is within or touching both images.
Raster Design prompts you to select one or more images to operate on. If you
are defining a region object, you can select multiple images and a REM object
is created for each image. If you are defining an enhanced bitonal region object
or a primitive object, you can select only one image when prompted.
AutoCAD Properties of REM Objects
Some AutoCAD properties apply differently to REM objects than to other
AutoCAD objects:
Color: REM objects do not respond to the AutoCAD Properties color setting.
Instead, you can use the 
 (page 351) dialog box to
 (page 57) and 
 (page 265).
Layer: REM objects are created on the current AutoCAD layer by default.
However, you can specify any layer.
Linetype: The vector boundary of a REM object is always displayed with
the current AutoCAD linetype. You can, however, change the linetype of
the raster data of a REM primitive object. For more information, see
 (page 186).
Width: Allows you to change the line width of the raster entity.
REM Objects and Non-REM Edits
You cannot use Raster Design commands that apply to an entire image if REM
objects are associated with the image. Such commands include Despeckle,
Mirror, Invert, Histogram, and Crop. Commands that operate on a sub-region
of an image are allowed only if the bounding box of the edit operation does
not overlap any REM objects.
When you create REM objects in an image, you must finish all REM edits and
merge, convert, or remove all REM objects before you can do any raster editing.
If you attempt to perform a non-REM edit that overlaps a REM object, the
Raster Design 
 (page 310) dialog box is displayed. Clear the REM
objects or merge the objects into the image before editing the entire image.
AutoCAD Properties of REM Objects | 167