"Wally" wrote in message
...
snip

How does the combination of blue and green screen work? Why two
colours,
IOW?


I was just trying to point out that you don't have to use blue, green
is another colour that is widely used, the main point being is that
the colour of the screen shouldn't clash with the colours that are
going to be placed against it - otherwise there is the possibility of
a presenters shirt (for example) also becoming invisible !...