Graphics length and width in Smartforms

Hi experts,

I need to insert a logo in a custom SMartform. I have imported the logo as a graphic via SE78 and I have created a new graphic in my Smartform with the same name. All this is working pretty fine. The only problem is that I can not change the width and the loength of the graphic (these fields are display only for the graphic). I can change the resolution of my graphic, but that doesn't make it take the dimensions I would have wished.

Is there any way to change the graphics dimensions?

Thanks in advance