read and write in binary

img2pdf.py

@@ -201,9 +201,9 @@ def main(images, dpi, title=None, author=None, creator=None, producer=None,
 
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description='lossless conversion/embedding of images (in)to pdf')
-    parser.add_argument('images', metavar='infile', type=argparse.FileType('r'),
+    parser.add_argument('images', metavar='infile', type=argparse.FileType('rb'),
                         nargs='+', help='input file(s)')
-    parser.add_argument('-o', '--output', metavar='out', type=argparse.FileType('w'),
+    parser.add_argument('-o', '--output', metavar='out', type=argparse.FileType('wb'),
                         default=sys.stdout, help='output file (default: stdout)')
     def positive_float(string):
         value = float(string)