Merge pull request #32 from ryanbagwell/develop

Trasparency preservation patch

imagekit/utils.py

@@ -4,6 +4,13 @@ import tempfile
 
 def img_to_fobj(img, format, **kwargs):
     tmp = tempfile.TemporaryFile()
-    img.convert('RGB').save(tmp, format, **kwargs)
+    
+    #preserve transparency if the image is in Pallette (P) mode
+    if img.mode == 'P':
+        kwargs['transparency'] = len(img.split()[-1].getcolors())
+    else:
+        img.convert('RGB')
+    
+    img.save(tmp, format, **kwargs)
     tmp.seek(0)
     return tmp