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27 Sep 2021 18:17:52 EDT (-0400)
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From: Thomas de Groot
Subject: Complementary colours
Date: 27 May 2021 11:05:00
Message: <60afb51c@news.povray.org>
Want to play with complementary colours? in rgb or srgb mode? Try this. 
Nothing special, just messing around for a change, away from granites...

-- 
Thomas


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From: Mike Horvath
Subject: Re: Complementary colours
Date: 27 May 2021 13:29:22
Message: <60afd6f2$1@news.povray.org>
On 5/27/2021 11:04 AM, Thomas de Groot wrote:
> Want to play with complementary colours? in rgb or srgb mode? Try this. 
> Nothing special, just messing around for a change, away from granites...
> 

This gets complicated.

Are you just selecting complementary hues? Are you keeping saturation 
and lightness the same?

What if you select complementary saturations and lightnesses as well?

What about Munsell system or CIELab? You are going to get different 
values in those systems as well.


Mike


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From: Thomas de Groot
Subject: Re: Complementary colours
Date: 28 May 2021 02:01:13
Message: <60b08729$1@news.povray.org>
Op 27/05/2021 om 19:29 schreef Mike Horvath:
> On 5/27/2021 11:04 AM, Thomas de Groot wrote:
>> Want to play with complementary colours? in rgb or srgb mode? Try 
>> this. Nothing special, just messing around for a change, away from 
>> granites...
>>
> 
> This gets complicated.
> 
> Are you just selecting complementary hues? Are you keeping saturation 
> and lightness the same?
> 
> What if you select complementary saturations and lightnesses as well?
> 
> What about Munsell system or CIELab? You are going to get different 
> values in those systems as well.
> 

You are certainly right :-) However, I just wanted to keep it simple 
while working on a scene, and get a colour complementary to another 
there, without all the complications I know nothing about anyway. You 
know, "I have this colour, what is its quick-and-dirty complement". That 
kind of thing. As I said, nothing special, just handy to have at hand 
while doing other things.

-- 
Thomas


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From: MichaelJF
Subject: Re: Complementary colours
Date: 28 May 2021 14:34:37
Message: <60b137bd$1@news.povray.org>
Am 27.05.2021 um 17:04 schrieb Thomas de Groot:
> Want to play with complementary colours? in rgb or srgb mode? Try this. 
> Nothing special, just messing around for a change, away from granites...
> 
I admit that I did not followed the granite discussion (too much 
entries). But red and blue are not complementary to each other in any 
colour modell I knew. Blue is complementary to some shade of yellow and 
red to some shade of green. There is a colour modell which takes red and 
cyan and blue and orange as complementary, but I could not find red and 
blue.

Best regards
Michael


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From: Mr
Subject: Re: Complementary colours
Date: 28 May 2021 15:10:00
Message: <web.60b13fa07910eb6d16086ed03f378f2@news.povray.org>
Thomas de Groot <tho### [at] degrootorg> wrote:
> Want to play with complementary colours? in rgb or srgb mode? Try this.
> Nothing special, just messing around for a change, away from granites...
>
> --
> Thomas

Inspiring ... could we get triadics? :-)


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From: Mike Horvath
Subject: Re: Complementary colours
Date: 28 May 2021 16:53:36
Message: <60b15850$1@news.povray.org>
On 5/27/2021 11:04 AM, Thomas de Groot wrote:
> Want to play with complementary colours? in rgb or srgb mode? Try this. 
> Nothing special, just messing around for a change, away from granites...
> 

Also, keep in mind (and you already may have!) that the idea of 
"complementary colors" was created for the RYB color model not RGB.


Mike


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From: Mike Horvath
Subject: Re: Complementary colours
Date: 28 May 2021 17:04:14
Message: <60b15ace$1@news.povray.org>
On 5/28/2021 4:53 PM, Mike Horvath wrote:
> On 5/27/2021 11:04 AM, Thomas de Groot wrote:
>> Want to play with complementary colours? in rgb or srgb mode? Try 
>> this. Nothing special, just messing around for a change, away from 
>> granites...
>>
> 
> Also, keep in mind (and you already may have!) that the idea of 
> "complementary colors" was created for the RYB color model not RGB.
> 
> 
> Mike

Basically, the idea is that colors diametrically opposed on the RYB 
color wheel "go well" with each other, and colors diametrically opposed 
on the RGB color wheel tend to "clash" heavily. I'm not sure why this is 
the case, and why the RYB color wheel "looks nice" (at least in Western 
art).


Mike


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From: Mike Horvath
Subject: Re: Complementary colours
Date: 28 May 2021 17:06:27
Message: <60b15b53$1@news.povray.org>
On 5/28/2021 5:04 PM, Mike Horvath wrote:> I'm not sure why this is > 
the case, and why the RYB color wheel "looks nice" (at least in Western 
 > art).
I have not seen a good explanation of this in my research.


Mike


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From: Alain Martel
Subject: Re: Complementary colours
Date: 28 May 2021 17:10:16
Message: <60b15c38$1@news.povray.org>
Le 2021-05-28 à 14:34, MichaelJF a écrit :
> Am 27.05.2021 um 17:04 schrieb Thomas de Groot:
>> Want to play with complementary colours? in rgb or srgb mode? Try 
>> this. Nothing special, just messing around for a change, away from 
>> granites...
>>
> I admit that I did not followed the granite discussion (too much 
> entries). But red and blue are not complementary to each other in any 
> colour modell I knew. Blue is complementary to some shade of yellow and 
> red to some shade of green. There is a colour modell which takes red and 
> cyan and blue and orange as complementary, but I could not find red and 
> blue.
> 
> Best regards
> Michael
Red, green and blue are the additive primaries, or RGB. Their usual 
complement are the subtractive primaries : Magenta for green, yellow for 
blue and cyan for red, or YCM.

This can obviously change if you use some other colour space.


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From: Mike Horvath
Subject: Re: Complementary colours
Date: 28 May 2021 17:16:46
Message: <60b15dbe$1@news.povray.org>
On 5/28/2021 5:06 PM, Mike Horvath wrote:
> On 5/28/2021 5:04 PM, Mike Horvath wrote:> I'm not sure why this is > 
> the case, and why the RYB color wheel "looks nice" (at least in Western 
>  > art).
> I have not seen a good explanation of this in my research.
> 
> 
> Mike

An analog might be the major scale in music. The seven notes A to G are 
not equidistant across an octave, yet they "sound nicer" (at least to 
Westerners) so they are given greater weight/bias than the other five 
tones. Dunno if it ultimately makes the life of someone learning music 
for the first time easier or harder, though.


Mike


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