On Sun, 20 Apr 2003 02:43:51 +0500, Xilo Musimene <xil### [at] hotpopcom>
wrote:

>Hmmm, isn't there 7 colors in the rainbow?

When I was a kid, I was taught the colors of the rainbow using the
name of a guy called "Roy G. Biv". That's Red, Orange, Yellow, Green,
Blue, Indigo, Violet.


Peter Popov ICQ : 15002700
Personal e-mail : pet### [at] vipbg
TAG      e-mail : pet### [at] tagpovrayorg

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> Red, Orange, Yellow, Green, Blue, Indigo and Violet.
> 
> Personally I only ever see a maximum of six in nature, the Blue, Indigo and
> Violet seem to be so close in hue they blend into two colours. In a darkened lab
> I'm sure I saw the seven but I wanted to, that may have helped.

Ok, good, I took note of it...  actually I'm just thinking it might be 
extremely wonderful to add a rainbow in my project!

Thanks,
   Xilo

-- 
Dedicated to audio/visual and interactive artwork.
Author of The Primary Colors of CSound:
http://www.geocities.com/simonlemieux/PCCS/index.html

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> Uh...the rainbow contains the entire spectrum. It has every color 
> possible with a single wavelength. It would look quite strange with 7 
> colors.

Yes, I knew that, but you know that when children are drawing their 
firsts drafts, they draw a horse, a house, the familly with a rainbow 
and they ask what colors are in a rainbow.  I remember having identified 
7 colors of the full spectrum that were known to be visually very 
identifiable when looking at a rainbow.  It is those 7 colors I wish to 
know (though it's already been answered elsewhere in this thread).

Thanks,
   Xilo

-- 
Dedicated to audio/visual and interactive artwork.
Author of The Primary Colors of CSound:
http://www.geocities.com/simonlemieux/PCCS/index.html

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> When I was a kid, I was taught the colors of the rainbow using the
> name of a guy called "Roy G. Biv". That's Red, Orange, Yellow, Green,
> Blue, Indigo, Violet.

WOW! This is the most incredible memory helper I've ever heard!  (I know 
a sentence that names the planet of the solar system in order, but this 
is very fun!)

I'll try to remember it too!

Thanks Peter,
   Xilo

-- 
Dedicated to audio/visual and interactive artwork.
Author of The Primary Colors of CSound:
http://www.geocities.com/simonlemieux/PCCS/index.html

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> Actually, when I was a child I was taught basic colours were red, blue and 
> yellow. Secondary colours would be green (blue + yellow), purple (red + 
> blue) and orange (yellow + red), cyan looks like a light blue.
> 
> I know this doesn't comply with colour theory, but it works when using real 
> paints (and when you're 6) ;)

Well those colors work in the Pigment theory, but in the Optics theory 
it's quite different, though the Pigment and Optic theory are linked as 
Pigment reflects Optics in a special manner...

Xilo

-- 
Dedicated to audio/visual and interactive artwork.
Author of The Primary Colors of CSound:
http://www.geocities.com/simonlemieux/PCCS/index.html

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> 
> I was talking of XVIII century, Dalton postulated elements were made out of 
> atoms which combined to form compounds, there were no neutrons or gamma 
> rays back then ;)
> 

Ok, now I understand what you were talking about...  the atomic theory, 
about the atoms, in no way (well, mostly) related to nukes! ;)

Thanks,
   Xilo

-- 
Dedicated to audio/visual and interactive artwork.
Author of The Primary Colors of CSound:
http://www.geocities.com/simonlemieux/PCCS/index.html

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> RGB- rgb x rgb y rgb z
> 
> CMY- rgb x+y rgb y+z rgb z+x

That's interesting, I did not know the relationship between to two color 
"formats"...

Thanks Rafal!
   Xilo

-- 
Dedicated to audio/visual and interactive artwork.
Author of The Primary Colors of CSound:
http://www.geocities.com/simonlemieux/PCCS/index.html

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Among other things, Xilo Musimene wrote:

>> When I was a kid, I was taught the colors of the rainbow using the
>> name of a guy called "Roy G. Biv". That's Red, Orange, Yellow, Green,
>> Blue, Indigo, Violet.
> 
> WOW! This is the most incredible memory helper I've ever heard!  (I know
> a sentence that names the planet of the solar system in order, but this
> is very fun!)
> 
> I'll try to remember it too!

How I like a drink, alcoholic of course, after the heavy chapters involving 
quantum mechanics...

Now count the letters in the words: 3.14159265358979... Does it look 
familiar? ;)

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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Among other things, Xilo Musimene wrote:

>> Actually, when I was a child I was taught basic colours were red, blue
>> and yellow. Secondary colours would be green (blue + yellow), purple (red
>> + blue) and orange (yellow + red), cyan looks like a light blue.
>> 
>> I know this doesn't comply with colour theory, but it works when using
>> real paints (and when you're 6) ;)
> 
> Well those colors work in the Pigment theory, but in the Optics theory
> it's quite different, though the Pigment and Optic theory are linked as
> Pigment reflects Optics in a special manner...

It's an approximation to subtractive colour theory, valid for everyday 
crayons and for children (how many chindren do know what "magenta" and 
"cyan" are?).

-- 
light_source{9+9*x,1}camera{orthographic look_at(1-y)/4angle 30location
9/4-z*4}light_source{-9*z,1}union{box{.9-z.1+x clipped_by{plane{2+y-4*x
0}}}box{z-y-.1.1+z}box{-.1.1+x}box{.1z-.1}pigment{rgb<.8.2,1>}}//Jellby

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On Mon, 21 Apr 2003 23:38:51 +0200, Jellby <jel### [at] M-yahoocom> wrote:

>
>How I like a drink, alcoholic of course, after the heavy chapters involving 
>quantum mechanics...
>

Pi did you say that :-)
Regards
        Stephen

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