diff --git a/stegano/steganalysis/parity.py b/stegano/steganalysis/parity.py
index 0dfb3ac..6034664 100644
--- a/stegano/steganalysis/parity.py
+++ b/stegano/steganalysis/parity.py
@@ -31,7 +31,7 @@ def steganalyse(img: Image.Image) -> Image.Image:
     """
     Steganlysis of the LSB technique.
     """
-    encoded: Image.Image = img.copy()
+    encoded = Image.new(img.mode, (img.size))
     width, height = img.size
     for row in range(height):
         for col in range(width):
diff --git a/tests/expected-results/parity_rgba.png b/tests/expected-results/parity_rgba.png
new file mode 100644
index 0000000..a1cf2af
Binary files /dev/null and b/tests/expected-results/parity_rgba.png differ
diff --git a/tests/test_steganalysis.py b/tests/test_steganalysis.py
index 26ae607..61dac1c 100644
--- a/tests/test_steganalysis.py
+++ b/tests/test_steganalysis.py
@@ -50,6 +50,15 @@ class TestSteganalysis(unittest.TestCase):
         diff = ImageChops.difference(target, analysis).getbbox()
         self.assertTrue(diff is None)
 
+    def test_parity_rgba(self):
+        """ Test that stegano.steganalysis.parity works with RGBA images
+        """
+        img = Image.open('./tests/sample-files/transparent.png')
+        analysis = parity.steganalyse(img)
+        target = Image.open("./tests/expected-results/parity_rgba.png")
+        diff = ImageChops.difference(target, analysis).getbbox()
+        self.assertTrue(diff is None)
+
 
 if __name__ == '__main__':
     unittest.main()