> > > http://www.howstuffworks.com/first-down-line.htm
> >
> > But I wonder what would happen if a player's shirt
>
> Pages 2 & 3 explain how the system uses two palettes -
> one for colours that can be drawn on and those that can't

Jinx,

I read those pages.  :-)

The thing is, both of those palettes are derived from the *same* image.  How
can you tell the player's green shirt from the green grass, if they're
_exactly_ the same color?  I can only think of two possible solutions to
this problem:

1.  The teams are told not to wear green uniforms, or to use a shade of
green different from the color of the grass
2. There must be another way of drawing the yellow line, that does not
involve using color palettes.

I'm not an expert on palettes, but I used to work for a publishing agency
and I had to deal with pixels, different color models, etc.  It's easy to
automatically cut out a red apple that is sitting on a gray table top.  But
let's say you got a white rabbit photographed against a snowy background.
In this case, the only thing you can do is remove the background by hand.

This brings up another question.  You've probably seen the commercials where
the main object (i.e., tiger) is color, and everything else is b&w.  How do
they make those?  I think the technology must be similar to what the
SporTVision uses.

Sincerely,

Vit

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