A lot of the theory about light and colour is the same as painting on the computer. However paint works on an subtractive colour system using CMY colour space. This means if you add all your colours together you'll get a dark brown and not white like a computer monitor. You get a brown and not black because the pigments don't reflect light in a perfect fashion. If you're using oil paints you should learn to paint fat over lean but that's about it.
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A lot of the theory about light and colour is the same as painting on the computer. However paint works on an subtractive colour system using CMY colour space. This means if you add all your colours together you'll get a dark brown and not white like a computer monitor. You get a brown and not black because the pigments don't reflect light in a perfect fashion. If you're using oil paints you should learn to paint fat over lean but that's about it.
http://boards.polycount.net/showthread.php?t=56160&highlight=painting
http://boards.polycount.net/showthread.php?t=55774&highlight=painting