diff --git a/nd2reader/parser.py b/nd2reader/parser.py
index 8df38cd..010de1e 100644
--- a/nd2reader/parser.py
+++ b/nd2reader/parser.py
@@ -247,6 +247,18 @@ class Parser(object):
         """
         return {channel: n for n, channel in enumerate(self.metadata["channels"])}
 
+    def _remove_unwanted_bytes(self, image_group_data, image_data_start, height, width):
+        # Remove unwanted 0-bytes that can appear in stitched images
+        number_of_true_channels = int(len(image_group_data[4:]) / (height * width))
+        unwanted_bytes_len = (len(image_group_data[image_data_start:]))%(height*width)
+        if unwanted_bytes_len:
+            warnings.warn('Identified unwanted bytes in the ND2 file, possibly stitched.')
+            byte_ids = range(image_data_start+height*number_of_true_channels, len(image_group_data)-unwanted_bytes_len+1, height*number_of_true_channels)
+            if all([0 == image_group_data[byte_ids[i]+i] for i in range(len(byte_ids))]):
+                warnings.warn('All unwanted bytes are zero-bytes, correctly removed.')
+                for i in range(len(byte_ids)):
+                    del image_group_data[byte_ids[i]]
+    
     def _get_raw_image_data(self, image_group_number, channel_offset, height, width):
         """Reads the raw bytes and the timestamp of an image.
 
@@ -273,17 +285,7 @@ class Parser(object):
         # of a four image group will be composed of bytes 2, 6, 10, etc. If you understand why someone would design
         # a data structure that way, please send the author of this library a message.
         number_of_true_channels = int(len(image_group_data[4:]) / (height * width))
-
-        # Remove unwanted 0-bytes that can appear in stitched images
-        unwanted_bytes_len = (len(image_group_data[image_data_start:]))%(height*width)
-        if unwanted_bytes_len:
-            warnings.warn('Identified unwanted bytes in the ND2 file, possibly stitched.')
-            byte_ids = range(image_data_start+height*number_of_true_channels, len(image_group_data)-unwanted_bytes_len+1, height*number_of_true_channels)
-            if all([0 == image_group_data[byte_ids[i]+i] for i in range(len(byte_ids))]):
-                warnings.warn('All unwanted bytes are zero-bytes, correctly removed.')
-                for i in range(len(byte_ids)):
-                    del image_group_data[byte_ids[i]]
-
+        self._remove_unwanted_bytes(image_group_data, image_data_start, height, width)
         try:
             image_data = np.reshape(image_group_data[image_data_start::number_of_true_channels], (height, width))
         except ValueError: