Reduce image size to avoid error on small data

pyVcardToQr/pyVcardToQr.py

@@ -22,16 +22,6 @@ def getCard(first, last, data):
 
 
 def genQr(data, output, colors=('black', 'white'), logo_path=None):
-    if logo_path is not None:
-        logo = Image.open(logo_path)
-        # taking base width
-        basewidth = 100
-
-        # adjust image size
-        wpercent = (basewidth/float(logo.size[0]))
-        hsize = int((float(logo.size[1])*float(wpercent)))
-        logo = logo.resize((basewidth, hsize), Image.ANTIALIAS)
-
     QRcode = qrcode.QRCode()
 
     # adding URL or text to QRcode
@@ -45,6 +35,14 @@ def genQr(data, output, colors=('black', 'white'), logo_path=None):
     img = QRcode.make_image(fill_color=fill, back_color=back).convert('RGB')
 
     if logo_path is not None:
+        logo = Image.open(logo_path)
+        # taking base width
+        basewidth = min(int(10 * img.width / 100), 100)
+
+        # adjust image size
+        wpercent = (basewidth/float(logo.size[0]))
+        hsize = int((float(logo.size[1])*float(wpercent)))
+        logo = logo.resize((basewidth, hsize), Image.ANTIALIAS)
         # set size of QR code
         pos = ((img.size[0] - logo.size[0]) // 2,
                (img.size[1] - logo.size[1]) // 2)