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What is the difference between IYUV, YV12, YUY2 ….etc?


I discovered one thing about wmv that I can’t quite figure out. Apparently WMV9 achieves at least some of its compression by reducing the color palette for the video. For example if you have true black for half the pixels and white for the other half then why not just represent the whole picture as Grey. Now this is an extreme case but it is not too far off from the way it actually works at low bit rates. I thought that the advanced profile would correct this but it did not. I set the Force Range Reduction to zero and it still looks faded compared to the same file compressed in H264. I was wondering if the Pixel Format had anything to do with it? In windows media encoder you can select the Pixel Format(ie: IYUV, YV12, YUY2 ….etc). What is the best format to pick? What are the differences? Does one offer a broader color band than the others?
 
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