Remove white background while using saveas command

Iam doing face recognition and automatic attendance i used crop command to crop only the faces after detecting. But how can i save the image without white background because in order to get mean image i should get rid of the white background

Answer 1

[Ahmet Cecen]

You want this:

http://www.mathworks.com/matlabcentral/fileexchange/23629-export-fig