I was trying to make my own custom shapes in Photoshop, so I first started out with an ellipse. I saw that all the shapes had pixelated edges. I went to turn Anti-Aliasing on in the marquee tool but it was grayed out. I couldn't select it.
I didn't touch Photoshop for a while, but now after 1 or 2 months this happened. Can someone please tell me how to turn it back on again? I'm on a MacBook Pro 10.8.4 and I'm using Photoshop CS6.