And we need color specification systems that are reliable and
uniform across different devices.
If you think about it, that's not a trivial problem at all.
So if I want to reproduce a specific kind of color,
I want to be able to use a specification that can be reproduced
in different devices, which is a quite complex problem.
So, one important thing to know, as I already mentioned earlier,
is that every color can be expressed as the sum of three colors,
or in general, as we will see,
every color can be expressed in a three dimensional space.
So let's start with a somewhat simple example.
If you have three lights and one light is blue, one light is green, and
one light is red, what we can do is to change the intensity
of these lights to basically match an existing color.
If we can do that, we actually have a way to specify