Look at the fourth one on the bottom, you can see the black splotches. It's not the best example I've seen, a quick search turned up this better example, notice

Look at the fourth one on the bottom, you can see the black splotches. It's not the best example I've seen, a quick search turned up this better example, notice how the edges become all dark: https://forum.shotcut.org/uploads/default/original/2X/e/edb33ad3cc83ee438452afcb9a7dc1eba127fd4d.jpg https://forum.shotcut.org/uploads/default/original/2X/e/edb3...