diff --git a/imgrate.py b/imgrate.py
index ec8fdc5..8a331f7 100755
--- a/imgrate.py
+++ b/imgrate.py
@@ -50,17 +50,20 @@ class imgrate:
 
 if __name__ == '__main__':
     from os import remove
+    from sys import exit
 
     def parse_arguments():
         ap = ArgumentParser()
         ap.add_argument('images', type=str, nargs='+', help='')
         ap.add_argument('-d', '--delete', action='store_true', help='Delete all but the best quality image.')
         ap.add_argument('-q', '--quiet', action='store_true', help='Print quality measurements only.')
+        ap.add_argument('-m', '--method', type=str, default='quality', help='Select quality measurement to use.')
         return ap.parse_args()
 
 
     def run(args):
-        ratings = {image: imgrate(image).quality for image in args.images}
+        try: ratings = {image: getattr(imgrate(image), args.method) for image in args.images}
+        except AttributeError: exit('Invalid --method option!')
         maximum = max(ratings, key=ratings.get)
 
         for rating in ratings.keys():