diff --git a/test/255x255.png b/test/255x255.png
new file mode 100644
index 0000000..a99fb5f
Binary files /dev/null and b/test/255x255.png differ
diff --git a/test/400x400.png b/test/400x400.png
new file mode 100644
index 0000000..cab3db6
Binary files /dev/null and b/test/400x400.png differ
diff --git a/test/test_function_image.py b/test/test_function_image.py
index 135da9e..89fcade 100644
--- a/test/test_function_image.py
+++ b/test/test_function_image.py
@@ -36,3 +36,15 @@ def test_function_image_with_50x50_png():
     """test the image function with 50x50.png (grayscale png)"""
     instance = printer.File(devfile=devfile)
     instance.image("test/50x50.png")
+
+@with_setup(setup_testfile, teardown_testfile)
+def test_function_image_with_255x255_png():
+    """test the image function with 255x255.png (grayscale png)"""
+    instance = printer.File(devfile=devfile)
+    instance.image("test/255x255.png")
+
+@with_setup(setup_testfile, teardown_testfile)
+def test_function_image_with_400x400_png():
+    """test the image function with 400x400.png (grayscale png)"""
+    instance = printer.File(devfile=devfile)
+    instance.image("test/400x400.png")