What video format for grayscale video?

I need to build a codec to implement image change detection
the coded take rgbformat buffer and i thibk it could be good to output a grayscale buffer.. can't find on the web any resource to define an grayscale buffer..
can some one help me?

At http://www.exactfutures.com/index02.htm is a link to simplecam.zip which includes JMF source for capturing a video stream from a webcam, processing or grabbing the pixel values, and then if need be rendering with text and graphics. It is designed to offer a solution for fast frame rates, and with scope for some inter frame processing from the minimum of code. It includes a sample text overlay and a process for grayscale.

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    I'd love to know this too, as I'm working on a very video-heavy presentation and have been using .dv files--love the clarity but I'm nearing a 1GB file with only about 4 min. of video in it so far. Clearly I have to slim it down, so any recommendations on video format would be very welcome!

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