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This is an updated verion of a previous "guest post". I've been asked to remove that post, but since the topic is relevant I will just summarize it here.
Images in AutoCAD have frames (even if you don't see them). Playing with the "IMAGEFRAME" system variable allows you to toggle from seeing or not seeing the frame. THe three settings for the IMAGEFRAME system variable are these:
If you set it to 0 it means the frame is completely off (not seen nor printed), setting it to 1 means the frame is on (seen and printed), and finally setting it to 2 means that the frame is on in the drawing, but it will be off in when you print.
Also, you can switch from Visible (number 1) to invisible (number 0) frames by using the TFRAME command. It doesn't allow to control the variable to set it to number 2 though, but this gives you the flexibility to switch on and off the frames quickly.