    # Python Program to find the resolution of a jpeg image without using external libraries
     
    def jpeg_res(filename):
       """"This function prints the resolution
       of the jpeg image file passed into it"""
     
       # open image for reading in binary mode
       with open(filename,'rb') as img_file:
     
           # height of image (in 2 bytes) is at 164th position
           img_file.seek(163)
     
           # read the 2 bytes
           a = img_file.read(2)
     
           # calculate height
           height = (a[0] << 8) + a[1]
     
           # next 2 bytes is width
           a = img_file.read(2)
     
           # calculate width
           width = (a[0] << 8) + a[1]
     
       print("The resolution of the image is",width,"x",height)
    jpeg_res("img1.jpg")