This tutorial shows you how to use the raster entity manipulation (REM) commands to edit bitonal (black and white) images of scanned drawings.
Using REM commands, you can define raster objects and manipulate them much as you do AutoCAD vector objects. As a result, you can update raster images without having to convert the raster entities into vectors.
You can use AutoCAD commands such as MOVE, COPY, and SCALE on REM objects to manipulate the raster data. The REM objects can be merged into existing images or they can be used to create new images.
AutoCAD Raster Design toolset allows you to create three types of REM objects.
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REM Object |
Description |
Image Types |
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Region object |
Contains all pixels within the region geometry (for example, all pixels within a polygonal region), whether or not the pixels comprise individual entities. |
Bitonal, grayscale, or color |
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Enhanced bitonal region object |
Facilitates the selection of a group of entities that intersect each other. Standard AutoCAD object selection criteria is enhanced with three methods: Smart. Selects raster entities that intersect with or cross a defined window or polyline (fence). Connected. Selects raster entities that are connected to entities selected by means of a window or fence. Connected Entity. Selects all raster entities connected to a specified point. |
Bitonal only |
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|
Primitive object |
Includes a single raster line, arc, or circle. |
Bitonal only |
In this tutorial, you work with the three types of REM objects and observe their varying behavior. You then use REM commands to modify a part in a mechanical drawing.