Use AutoCAD Raster Design to perform REM editing

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In AutoCAD Raster Design, you can use Raster Entity Manipulation, or REM, to edit raster images.

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For example, REM allows you to change the radius of a circle, remove lines on a mechanical drawing,

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or copy symbols from one image to another.

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Editing with REM commands involves three steps.

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First, you create raster entities, which include regions, enhanced bitonal regions, and primitives.

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Then, you perform the edits.

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Finally, you merge the raster entities back into the image.

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The image here includes a variety of details on a plan sheet in raster format.

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In this example, you want to make room for new work by moving one of the details.

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First, you need to create a raster entity, or in this case, an REM region object.

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A region object allows you to work with the pixels inside a specified area.

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On the ribbon, Raster Tools tab, REM panel, expand the Create Region drop-down and choose Rectangular.

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Zoom in to the detail you want to change—here, the Index Finger—and click two different points to define a rectangle around it.

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Now, moving the rectangular region object includes all data within the defined rectangle.

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From the ribbon, Home tab, Modify panel, select the Move tool.

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Click the rectangular region to select it.

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Then, press ENTER to complete the selection.

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Click the lower-left corner of the rectangle to define the base point, and then drag to move the rectangle to the right and down slightly.

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Click again to set the new location of all data inside the region.

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To make the change permanent, select the Raster Tools tab, and in the REM panel, click Merge to Raster Image.

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Select the object to merge—here, the rectangular region—and then press ENTER.

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The entity merges back into the original image.

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The next example uses an REM enhanced bitonal region, which allows you to select complete raster entities in a bitonal image.

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On the REM panel, select Enhanced Region to expand the drop-down and view the list of regions.

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You can also choose regions using windows or crossings.

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In this case, click Connected Entity.

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On the image, click anywhere on the Mandrel Rib Plate.

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The entire entity appears highlighted, because Raster Design finds all raster data associated with the part.

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Click the Home tab, and then in the Modify panel, click Copy.

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Select the entity to copy, the highlighted mandrel rib plate, and then press ENTER.

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Click the lower-left corner of the detail to set the base point, and then drag up and to the right of the original.

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Click to place the new entity in the empty space resulting from moving the Index Finger.

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Press ENTER to make the copy.

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Switch back to the Raster Tools tab, and then on the REM panel, click Merge to Raster Image.

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Select the copy of the entity, and then press ENTER to merge it back into the image.

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Since the original entity was not changed, simply clear it.

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You can either click Clear Selected, select the entity, and then press ENTER, or click Clear All.

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While you could also use raster editing tools to perform similar edits,

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the value of REM commands is that they can significantly reduce the number of editing steps.

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After defining REM objects, you can use either AutoCAD commands

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or AutoCAD Raster Design toolset commands to edit the objects in the same way as vector objects.

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To illustrate this point, the next example modifies only a portion of a raster image using a primitive.

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Because their dimensions can be changed, primitives are more intelligent than regions and enhanced bitonal regions.

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On the REM panel, expand the Create Primitive drop-down and select Circle.

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On the copy of the mandrel rib plate you just created, click the outer circle.

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AutoCAD Raster Design creates a circle, which you can now modify using editing grips.

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Click the circle, and then click a grip and drag to expand the circle.

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Drag the opposite way to make it smaller than the original, and the underlying raster circle disappears, replaced by the smaller one.

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On the REM panel, click Merge to Raster Image to merge the smaller circle into the image.

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As you can see, raster entity manipulation, or REM allows you to modify specific raster data elements in ways similar to editing vector data.

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The streamlined functionality of REM saves you steps and time when compared with standard raster editing tools.