Newton said that light was "Made of" 7 colours
Later James Clarke-Maxwell suggested (In some pretty complex
mathematics) that the "Rainbow" was actually made of 3 colours and all
other colours were combinations of any two of these three.
So there is no pure Cyan light.
Cyan ink is a substance that absorbs red light so when you paint a sheet
of white paper with it, then shine a light on it, you only get to see
the other two colours coming back at you (R+G)
The principles of mixing colours using paint (Red, Yellow, Blue)are not
too scientific and require the addition of a fair amount of white to get
most colours.
You don't need all three primary(Or secondary) colours to make any
colour. You need only two of the three. A mixture of all three will give
you grey. So it's either R+B or R+G or B+G (C+M, C+Y, Y+M)
Of course it's all about human perception. What we SEE... Dr. Edwin Land
of polaroid fame has a new colour theory that says that we perceive via
only 2 colours...
http://www.rowland.harvard.edu/organization/land/theory.php
Herschel
Howard wrote:
Easier to refer you to Wikipedia (that's now the coward in me! :-[ )
http://en.wikipedia.org/wiki/Primary_color
I often get students baffled on this because in Art they seem to be
taught (as I was aeons ago) that the primary colours are red yellow
and blue...!)
Howard
MichaelHughes7A@xxxxxxx wrote:
In a message dated 11/11/2008 05:46:29 GMT Standard Time,
howard.leigh111@xxxxxxxxxxxx writes:
Being pedantic (it's the teacher in me) the complementary colour
pairs are....
Primary - complementary:
red - cyan
blue - yellow
green - magenta
May I ask the pedant for his definition of primary colour please?
Michael
