Mambo Taxi

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YUV as described in Wikipedua has the same equations as the Jpeg YCbCr (which is the very last box in the wikipedia YCbCr article.

In the YUV article they're treated as floating point numbers between 0-1.
In the YCbCr, they're treated as 8 bit numbers.

This is the relevant bit:

Y' =       + 0.299    * R'd + 0.587    * G'd + 0.114    * B'd
Cb = 128   - 0.168736 * R'd - 0.331264 * G'd + 0.5      * B'd
Cr = 128   + 0.5      * R'd - 0.418688 * G'd - 0.081312 * B'd

Either way, you shouldn't have too much difficulty with it, and it's likely to be much more useful than HSV. :)