How does autographing work?

I've only been to Comic Con where they have pre printed pictures to get signed, do they have those there, or do you have to bring something for them to sign? And I've heard that the autographs are free?

Most cons are different since a convention I went to had a space in the booklet for autographs and I heard last year for the SPG autographs, people who waited for a long time in line felt more upset hearing that they had to PAY for autographs when they got there (rumors that I heard that they paying thing was conducted by their manager or something) I don't really know how it'll be for this year, but keep an eye out for other information. Not all the guests makes people pay for their autographs. Each and every one of them is different (or somewhat similar)

You should bring something to have signed, because I'm unsure who will have stuff for you. Last year, SPG, had a booth in the dealers room where allot of people bought posters and CDs to have signed. Last year though one had to pay to get something signed, which confused allot of us who thought autographs we're free. I Waited about 2 and a half hours before ditching the line ten minutes before they let everyone in because I had no money to,pay for an autograph and my camera was dead. I believe most if not all autograph should be free this year, running off what the events page says concerning this. I would allow yourself at least a 2 hour window (depending on who is signing). You can always buy something from the dealers room and have it signed (keep in mind voice actors tend to only sign something of official merchandise or a print off picture of a character or show they voiced in) Hope this helped