Reorder red/green layers in the graphical unit test (#1299)

Author: markromanmiller

tests/utils/GraphicalUnitTester.py

@@ -102,16 +102,16 @@ def _show_diff_helper(self, frame_data, expected_frame_data):
         diff_im = expected_frame_data.copy()
         diff_im = np.where(
             frame_data != np.array([0, 0, 0, 255]),
-            np.array([255, 0, 0, 255], dtype="uint8"),
+            np.array([0, 255, 0, 255], dtype="uint8"),
             np.array([0, 0, 0, 255], dtype="uint8"),
-        )  # Set the points of the frame generated to red.
+        )  # Set any non-black pixels to green
         np.putmask(
             diff_im,
-            expected_frame_data != np.array([0, 0, 0, 255], dtype="uint8"),
-            np.array([0, 255, 0, 255], dtype="uint8"),
-        )  # Set the points of the frame generated to green.
+            expected_frame_data != frame_data,
+            np.array([255, 0, 0, 255], dtype="uint8"),
+        )  # Set any different pixels to red
         ax.imshow(diff_im, interpolation="nearest")
-        ax.set_title("Differences summary : (red = got, green = expected)")
+        ax.set_title("Differences summary : (green = same, red = different)")
 
         plt.show()
         plt.savefig(f"{self.scene}.png")