dpi

Question

i have a raster image map51337715.tif. I tried to open it in photo elements. the width is 4601 and the height is 3697 and the resolution is 72 pixel/inch. I am making a form that loads an image. I also want to display the image width, height and resolution. I am now able to display the width and height except for the resolution. I am having hard time how would I be able to display the resolution such as the map5137715 which is 72 pixel/inch. anybody who could help me? i would really appreciate any help from you guys.