Trying to have an imported image scale to fit form field in a PDF

Hi, I am creating a an editable PDF with multple form fields including an image field. I have a shape that is 1.5x1.25" for the field. I want to know if there is a script I can add so the importaed image scales up so it fits the shape 100% instead of just scaling proportionaly to the width or height.

Thanks

D