[Plugin: NextGEN Gallery] 1 random image

I keep running into this issue…
How do you display 1 random image from a gallery at a particular size?
This is what I am doing…

$number_of_pic = '1';
$Width = '278';
$Height = '195';
if (function_exists("nggDisplayRandomImages"))
{ nggDisplayRandomImages($number_of_pic,$Width,$Height);

and it works EXCEPT the quality of the image is terrible!! Like it is scaling a thumbnail up! Please help.