[preview] Fix bug in ratio calculation

url_image_preview/url_image_preview.py

@@ -19,6 +19,7 @@ import os
 import hashlib
 import binascii
 import logging
+import math
 from urllib.parse import urlparse
 from io import BytesIO
 import shutil
@@ -374,11 +375,11 @@ class Base(object):
 
         if image_width > image_height:
             if image_width > size:
-                image_height = int(size / float(image_width) * image_height)
+                image_height = math.ceil((size / float(image_width) * image_height))
                 image_width = int(size)
         else:
             if image_height > size:
-                image_width = int(size / float(image_height) * image_width)
+                image_width = math.ceil((size / float(image_height) * image_width))
                 image_height = int(size)
 
         return image_width, image_height