Add result image decode

handler.py

@@ -26,6 +26,9 @@ class EndpointHandler():
                   "width": 768}
 
         img = self._pipe(**params).images[0]
+        buf = BytesIO()
+        img.save(buf)
+
         res = {"status": 200,
-               "image": base64.b64encode(img).decode("utf8")}
+               "image": base64.b64encode(buf).decode("utf8")}
         return res