Autotek autocad raster design 2010 用户手册

1 Select the mask boundary, then right-click to open the Properties dialog

box.

2 In the Properties dialog box, click Enabled in the Misc category.

3 Click Yes from the list to enable the mask, or No to disable the mask.

Menu

Image  ➤  Mask  ➤  Create

Command Line

imask

You can use the AutoCAD IMAGECLIP command to display a subregion of
one image.

A clip is a display-only feature that you can use for viewing and plotting
purposes. It does not permanently change image data.

The subregion is defined by a clip boundary. When you clip an image, parts
of the image outside the clip boundary are hidden from view. You can turn
off the clip to redisplay the entire image. You can grip edit the clip boundaries
to display more or less of the image. If the clip boundary encloses multiple
images, each one is handled as a separate clip.

The IMAGECLIP command works on AutoCAD images (bitonal, grayscale,
index color or true color) and on Raster Design custom images (digital elevation
models, single-band integer data, or multiband multispectral data).

The IMAGECLIP command works on AutoCAD images (bitonal, grayscale,
index color or true color) and on Raster Design custom images.

NOTE To display a polygonal sub-region of more than one image, use the Raster
Design Mask command. For more information, see 

 (page

137). To permanently trim one or more images, use the Raster Design Crop
command. For more information, see 

 (page 144).

142 | Chapter 6   Modifying Images