diff --git a/tutorial_data/pictures/sun/sun.png b/tutorial_data/pictures/sun/sun.png
index 6368e7b3fd446fd833d7875239623978e1105ba5..f8eb031b5f45a135b877a237a9e11bb993032594 100644
Binary files a/tutorial_data/pictures/sun/sun.png and b/tutorial_data/pictures/sun/sun.png differ