diff --git a/keras_preprocessing/image/image_data_generator.py b/keras_preprocessing/image/image_data_generator.py
index 5a44d31b..8f9a454d 100644
--- a/keras_preprocessing/image/image_data_generator.py
+++ b/keras_preprocessing/image/image_data_generator.py
@@ -427,7 +427,8 @@ def flow(self,
             save_to_dir=save_to_dir,
             save_prefix=save_prefix,
             save_format=save_format,
-            subset=subset
+            subset=subset,
+            dtype=x.dtype
         )
 
     def flow_from_directory(self,
diff --git a/keras_preprocessing/image/numpy_array_iterator.py b/keras_preprocessing/image/numpy_array_iterator.py
index f03434ba..2a45bf16 100644
--- a/keras_preprocessing/image/numpy_array_iterator.py
+++ b/keras_preprocessing/image/numpy_array_iterator.py
@@ -109,7 +109,7 @@ def __init__(self,
                 if y is not None:
                     y = y[split_idx:]
 
-        self.x = np.asarray(x, dtype=self.dtype)
+        self.x = np.asanyarray(x, dtype=self.dtype)
         self.x_misc = x_misc
         if self.x.ndim != 4:
             raise ValueError('Input data in `NumpyArrayIterator` '