diff --git a/PIL/ImageTk.py b/PIL/ImageTk.py
index 68d388e74..7518cc1a5 100644
--- a/PIL/ImageTk.py
+++ b/PIL/ImageTk.py
@@ -33,6 +33,7 @@ except ImportError:
     del Tkinter
 
 from PIL import Image
+from io import BytesIO
 
 
 # --------------------------------------------------------------------
@@ -52,6 +53,15 @@ def _pilbitmap_check():
             _pilbitmap_ok = 0
     return _pilbitmap_ok
 
+def _get_image_from_kw(kw):
+    source = None
+    if "file" in kw:
+        source = kw.pop("file")
+    elif "data" in kw:
+        source = BytesIO(kw.pop("data"))
+    if source:
+        return Image.open(source)
+
 
 # --------------------------------------------------------------------
 # PhotoImage
@@ -80,13 +90,7 @@ class PhotoImage(object):
 
         # Tk compatibility: file or data
         if image is None:
-            if "file" in kw:
-                image = Image.open(kw["file"])
-                del kw["file"]
-            elif "data" in kw:
-                from io import BytesIO
-                image = Image.open(BytesIO(kw["data"]))
-                del kw["data"]
+            image = _get_image_from_kw(kw)
 
         if hasattr(image, "mode") and hasattr(image, "size"):
             # got an image instead of a mode
@@ -209,13 +213,7 @@ class BitmapImage(object):
 
         # Tk compatibility: file or data
         if image is None:
-            if "file" in kw:
-                image = Image.open(kw["file"])
-                del kw["file"]
-            elif "data" in kw:
-                from io import BytesIO
-                image = Image.open(BytesIO(kw["data"]))
-                del kw["data"]
+            image = _get_image_from_kw(kw)
 
         self.__mode = image.mode
         self.__size = image.size
diff --git a/Tests/test_imagetk.py b/Tests/test_imagetk.py
index 87a07e288..1c265f650 100644
--- a/Tests/test_imagetk.py
+++ b/Tests/test_imagetk.py
@@ -1,15 +1,43 @@
 from helper import unittest, PillowTestCase
+from PIL import Image
 
+try:
+    from PIL import ImageTk
+    dir(ImageTk)
+except (OSError, ImportError) as v:
+    # Skipped via setUp()
+    pass
 
 class TestImageTk(PillowTestCase):
 
-    def test_import(self):
+    def setUp(self):
         try:
             from PIL import ImageTk
             dir(ImageTk)
         except (OSError, ImportError) as v:
             self.skipTest(v)
 
+    def test_kw(self):
+        TEST_JPG = "Tests/images/hopper.jpg"
+        TEST_PNG = "Tests/images/hopper.png"
+        im1 = Image.open(TEST_JPG)
+        im2 = Image.open(TEST_PNG)
+        with open(TEST_PNG, 'rb') as fp:
+            data = fp.read()
+        kw = {"file":TEST_JPG, "data":data}
+
+        # Test "file"
+        im = ImageTk._get_image_from_kw(kw)
+        self.assert_image_equal(im, im1)
+
+        # Test "data"
+        im = ImageTk._get_image_from_kw(kw)
+        self.assert_image_equal(im, im2)
+
+        # Test no relevant entry
+        im = ImageTk._get_image_from_kw(kw)
+        self.assertEqual(im, None)
+
 
 if __name__ == '__main__':
     unittest.main()