Re: Colors in Sherall

----- Original Message -----
From: "David Starner" <dvdeug@...>

> On Wed, Jun 04, 2003 at 07:43:05PM -0400, Sally Caves wrote:
> > What is it, then, that they see-- or not see?
>
> When you see a color yellow, your red and your green sensors in your
> eyes are responding and your brain interprets that as yellow. That's why
> a computer screen or TV which can only display red, green and blue can
> display what you see as yellow.
Aha!  The additive (isn't it?) primary colors (that found in light):  red,
green, and blue (white in the center), as opposed to the subtractive?
primary colors (that found in paint): red, blue, and yellow (gray or black
in the center)?   In the additive, red ovelapping green makes yellow; green
overlapping blue makes... what? and blue overlapping red makes...magenta?  I
can't remember.  We used to play with lights in our art class.  Boy, it's
been a long time.

In theory, a tetrachromat could tell the
> difference between the yellow in a rainbow and any yellow (red/green
> mixture) a monitor or TV could display.
I don't get the difference.  I thought both were additive color.  Do you
mean the yellow in a paint palette, rather, versus the yellow on a monitor?

(In practice, due to the way
> that tetrachromatism appears in humans, usually an extra copy of an
> existing color gene, most human tetrachromats can only distinguish
> between two close shades of green or red, and they're also usually
> female.
So they are color "blind"?

Sally Caves
scaves@frontiernet.net
Eskkoat ol ai sendran, rohsan nuehra celyil takrem bomai nakuo.
"My shadow follows me, putting strange, new roses into the world."

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