[gtkmm] Picture Scaling question

[David Kinyanjui <david i2software com>]

Hey;
I have a fixed size Gtk::Image widget ( width: 168 by height: 90) that 
I'm using to display a patient picture.
The problem that I'm having is that if the loaded picture that need to 
be displayed is bigger than the allocated space, it tend to be disformed 
or in other word it's diplayed partially (can only see some part... e.g 
from nose bridge and up).

Here is an example on how I'm loading the picture corresponding to the 
given IdNO:
if (txtIdentificationNo->get_text() == "71924")
{       //load oldwoman.jpg
       //config.picturePath is file path ...folder where picture have 
been stored

       pixPatient->set(config.picturePath + "oldwoman.jpg");  
//config.picturePath is file path ...folder where picture have been stored
}
Now, I'm kindly seeking some help or ideas on how I can scale these 
picturing during loading so that they can fit without getting disformed 
or parts being hidden during diplay.