Once an image has been inserted, scaled and rotated into a drawing, it may be desirable to create a "world file" (see the frequently changing Wikipedia topic at http://en.wikipedia.org/wiki/World_file for additional information) from the image so that the image can be re-inserted into a drawing at the proper placement, scale and rotation angle by using the Place Image by World File command.
A common method for inserting raster images into a drawing that don't have an accompanying "world file" would be through the use of the Place Google Earth Image command.
Select images to process.
Select entities: Select the raster entities whose world file should be
created
Pulldown Menu Location(s):
Images
Keyboard Command: make_geotiff
Prerequisite: Raster image in the DWG