Please Help!I want to extract same area of interest from the two images (a panchromatic of higher resolution and another one XS image consisting of three bands of less resolution) The area of interest should be common in both. How do i do that???

i have two images. one is panchromatic image and another one a multispectral image consisting of R G B bands. panchromatic has higher resolution than the multispectral one .Both the images are from the same sensor. I want to extract same area of interest from the two images. The area of interest should be common in both. How do i do that???