First off, forgive me if this is a stupid question. The graphic design community isn't my ordinary community, so all the concepts are very foreign to me.
I was looking for ways to anti-alias a sprite for a video game, and upon searching common queries such as "how to anti-alias an image", or "anti-aliasing a sprite in photoshop" I received very little information. Maybe I'm just not looking very hard and am missing something very obvious, but it looks like there isn't one program or one well-defined way to input an image and get an anti-aliased version as output.
I saw a lot of specific situations for anti-aliasing, a lot of which was focused on anti-aliasing fonts for some reason. I was expecting to just see an "anti-alias filter" in photoshop in the first few search results but there doesn't seem to be one (again, unless I'm just being stupid).
So is a lot of anti-aliasing just done by hand? What are some techniques professional sprite artists use to anti-alias their images? Are there programs that do it automatically, or is the only way to get it good results to do it yourself?