How to delete image frame & How to crop image in cad file

To Delete the frame; 
If you do not want the frame of the image which you inserted in autocad, there is the way here;

1.type 'imageframe' in command line then hit space bar

2.type the new value, set to be '0'. then hit space bar

the image frame will be off!.

To Crop the image;

1.draw polyline to define area to crop over the image.

2.type 'imageclip' in command line then hit space bar

3.type "S"(select polyline)

4.select polyline which we have drawn in item1, there you go!