Can I see photos/video stored in my iMac on TV with use of Apple TV?

I got a lot of photos / video clips stored in my iMac which is placed at study room. I always want to show them on my HD TV at living room. Can my iMac send signal to Apple TV and so show photos/video clips on my HDTV?

I've bought honestech nScreen which can help me to do this like a router. However, signal is very unstable, esp on HD movie. Hope that Apple TV can help.

I am currently using Aperture to store my photos and iMovie to store the movies.

Apple TV

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