re: The color Purple
re: The color Purple
- Subject: re: The color Purple
- From: Ray Maxwell <email@hidden>
- Date: Mon, 27 Mar 2006 18:51:27 -0800
Hi Gordon,
The error in this companies presentation is the fact that they represent
purple as a spectral color at the blue end of the spectrum. Their
"purple" is made up of the following RGB values:
99R 57G 186B
This is a non spectral color in the magenta family. This means that it
is a color that cannot be produced by a single spectral frequency. This
is a color that is an illusion in the brain when you stimulate the long
wave cone and the short wavelength cone with very little stimulation of
the mid wavelength cone. I have always used this as an illustration of
how the eye has only three overlapping channels and is not good at
discriminating multiple frequencies of light.
Imagine that you play two notes on a piano at the same time. Your ear,
which has thousands of frequency sensitive hairs in the cochlea, has no
problem knowing that two notes are being played. However, if you mix
the light from a red and blue LED, the eye sees one color which is
magenta. It is like saying that when you play a cord of spectral
frequencies your eye only sees one note.
Another way of saying this is that magenta cannot be produced with a
single spectral frequency. You have to mix two or more colors to
produce this sensation in the brain.
Now back to the tribecalabs...I think they are showing a short coming in
the RAW to color space conversion rather that the fact that digital
cameras are blind to purple. It may also be a problem with the LCD in
the camera. For their claims to be true, the camera would have to be
blind to red, green, and blue as show from the data values above.
Ray
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