Other features of 3D modeling - Introduction to AutoCAD 2011: 2D and 3D Design - page 386

Fig. 19.4 Raster image in a drawing - the Select Reference File and Attach Image dialogs
the selected raster image. If satisfi ed click the OK button. The dialog
disappears and the command line shows:
Command: _IMAGEATTACH
Specify insertion point <0,0>: pick
Base image size: Width: 1.000000, Height:
1.041958, Millimeters
Specify scale factor <1>: enter 60 right-click
Command:
And the image is attached on screen at the picked position.