My situation was very close to yours. I also married a black guy. We dated 7 years before getting married and the main reason for that was to let my family get used to the situation.It was difficult, yes. After we got engaged my mom didn't speak to me for 3 months. My dad tried to be happy but I could tell he wasn't. The beginning of the engagement wasn't the happy time that most engagements are. But my Dh charmed over my whole family. One of the biggest concerns with Indian parents in what other people are going to think and say. Once they saw that my family loved him and their friends loved him, my parents came around as well.They were happy on my wedding day but even I know that my Mom was a little sad. She would've have been happier if I had gone the traditional route. But you know what, the wedding is over and everyone has gone on with their lives and me and my DH couldn't be happier.Hopefully they come around, but even if they don't you still have to do what will make you happy. It will work out in the end.
Good luck! Oh and there quite a few brides on this board that have gone through this, you will probably get more responses on Monday as this board is busier during the week.