I don't think any team would use green uniforms because it would make it
too hard for the players to spot each other.  The players want to
contrast with the field, and that happens to work for the video
processing too.

I friend of mine does something similar for Grand Prix racing.  They put
up billboards that are painted flat green.  They can then superimpose
advertisements on the boards when they are seen in the video.  They can
change advertisements as the race progresses... chips at the start, beer
a few minutes later, insurance after an accident, etc.

Sherpa Doug

> -----Original Message-----
> From: Vit [mailto:piclist2001@HOTMAIL.COM]
> Sent: Monday, February 04, 2002 12:07 PM
> To: PICLIST@MITVMA.MIT.EDU
> Subject: Re: [OT]:Color Palettes (was: " Was that a GREAT
> Super Bowl or
> what?")
>
>
> > > > 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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