Определяем разрешение JPEG изображения

j.py

def jpeg_res(filename):
   # open image for reading in binary mode
   with open(filename,'rb') as img_file:

       # height of img (in 2 bytes), 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)