Autotek autocad raster design 2010 用户手册

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NOTE If you select Do Not Affect, any images that were previously unloaded
by the mask must be manually reloaded if you want to view them. Any images
that were previously hidden by the mask must be manually shown. To show
a hidden image, select the image frame, then right-click and click Show
Image.
If you select Hide Image(s) or Unload Image(s), you can select Show Image
Frame(s) to show the frames of hidden or unloaded images.
Quick Reference
Menu
Image  ➤  Options
Raster Design Toolbar
Command Line
ioptions
Dialog Box
Image Thumbnails
This setting specifies whether to create an image thumbnail whenever you
save an image.
Image thumbnails greatly increase the speed at which you can preview images
in the Raster Design Insert Image dialog box, the Histogram dialog box, and
the AutoCAD Image Adjust dialog box.
Saving an image thumbnail with each image increases the image file size only
slightly. For more information, see 
To create thumbnails of images
Click Image menu  ➤  Options. The 
dialog box is displayed.
Click the Feature Settings tab.
Image Thumbnails | 255