"William Sommerwerck" wrote in message
...
"Arfa Daily" wrote in message ...

That triangular diagram with red, green and blue at the corners
and white in the middle, and intended to show every possible colour that
can be derived from additive mixing of those three
colours, is called a chromaticity diagram. It famously used to be
used to show that a colour CRT cannot (truly) produce brown.

You've never seen a '70s RCA set? Brown was about the only color it
/could/ produce (along with some blues and yellows, if I recall
correctly).

Brown is actually a very dark red.


ISTR from my college days that brown is known as a non-spectral colour, and
cannot truly be produced by mixing R, G and B in any proportion, and this is
shown by the chromaticity diagram. Rather, it is a perceived colour that is
'worked out' by the brain, based on experience and surrounding colours.

Arfa