ducktype the array_interface obj to see if it provides tobytes or tostring

PIL/Image.py

@@ -1944,7 +1944,10 @@ def fromarray(obj, mode=None):
 
     size = shape[1], shape[0]
     if strides is not None:
-        obj = obj.tostring()
+        if hasattr(obj, 'tobytes'):
+            obj = obj.tobytes()
+        else:
+            obj = obj.tostring()
 
     return frombuffer(mode, size, obj, "raw", rawmode, 0, 1)