Hi,

I was wondering if anybody could help me to a color mixing tool? I've found
enough color pickers with all kind of options, but non with the same options you
have in real life. When I have a certain color I often just want to add a hint
of an other color, as I do with painting, but can find it quite hard to get the
right touch with the numbers.

Thanks, Joost

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> Hi,
>
> I was wondering if anybody could help me to a color mixing tool? I've
> found enough color pickers with all kind of options, but non with the
> same options you have in real life. When I have a certain color I often
> just want to add a hint of an other color, as I do with painting, but can
> find it quite hard to get the right touch with the numbers.

   I usually do this just with simple arithmetic operations and predefined
colors from colors.inc:

   #declare my_color=Red*.5+Blue*.2+White*.1;

   As you say, it's much easier to work with proportions in a mix of colors,
like in a painting palette.


-- 
Jaime Vives Piqueres

http://www.ignorancia.org

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On 11/26/2009 10:22 AM, joost_1972 wrote:
> Hi,
>
> I was wondering if anybody could help me to a color mixing tool? I've found
> enough color pickers with all kind of options, but non with the same options you
> have in real life. When I have a certain color I often just want to add a hint
> of an other color, as I do with painting, but can find it quite hard to get the
> right touch with the numbers.
>
> Thanks, Joost

That's a very interesting idea. I might try and create such a tool.


--
Michael Horvath
mik### [at] gmailcom
http://isometricland.com

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"SharkD" <mik### [at] gmailcom> schreef in bericht 
news:4b0eec8a$1@news.povray.org...
> That's a very interesting idea. I might try and create such a tool.
>

and then in sRGB space?

Thomas

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El 26/11/09 22:01, SharkD escribió:
> That's a very interesting idea. I might try and create such a tool.
>

   I just found an online tool that could be used as inspiration:

   http://javascript.about.com/library/blpaint4.htm

   Regards,


-- 
Jaime Vives Piqueres

http://www.ignorancia.org

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Thanks for the reactions

@Jaime: that makes it a lot easier, indeed, hadn't thought that was possible.
I'm going to experiment with that.

@Michael: I'll be waiting in anticipation... ;-)

Grtz, Joost

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joost_1972 wrote:
> Hi,
> 
> I was wondering if anybody could help me to a color mixing tool? I've found
> enough color pickers with all kind of options, but non with the same options you
> have in real life. When I have a certain color I often just want to add a hint
> of an other color, as I do with painting, but can find it quite hard to get the
> right touch with the numbers.
> 
> Thanks, Joost

Sometimes when I need a real-life color, I will open a photo with 
IrfanView and click on the color I want, to read the RGB values. I take 
those values and convert them in POV like so:

rgb <128,96,250>/256

If you want to mix colors this way, just use Gimp or another paint 
program and use the eyedropper tool to the get RGB values, and divide 
that color vector by 256.

Sam

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stbenge wrote:
> If you want to mix colors this way, just use Gimp or another paint 
> program and use the eyedropper tool to the get RGB values, and divide 
> that color vector by 256.

Actually, divide by 255 since there are 256 colors, but they are in the 
range 0-255. #FFFFFF; = <255,255,255>/255 = <1,1,1>

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CShake <cshake+pov### [at] gmailcom> wrote:
> stbenge wrote:
> > If you want to mix colors this way, just use Gimp or another paint
> > program and use the eyedropper tool to the get RGB values, and divide
> > that color vector by 256.
>
> Actually, divide by 255 since there are 256 colors, but they are in the
> range 0-255. #FFFFFF; = <255,255,255>/255 = <1,1,1>

Yes! This is a very common mistake that I've seen in lots of code (in various
languages) over the years.


Here are a couple of colour mixing formulas that I find useful. In these
formulas, C, C0 & C1 are colour vectors, and A is a float, 0 <= A <= 1.

//A weighted mean between colours C0 and C1
C0 * A + C1 * (1-A)

//A muted version of colour C
rgb A + C * (1 - A)

In POV-Ray, it's possible to use negative colours, eg rgb<-1, 0, 0> is identical
to rgb <0, 1, 1>. It's also possible to use colours with components greater than
1, but such colours will get clipped in strong light, so it's probably a good
idea to avoid using this "feature".

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Thanks, I already used an external tool to get my rgb values (and divided by
255, pfewww), but being able to weigh colors and use them in formula's is new to
me, and having experimented with that, its really giving me extra possibilities,
very glad with that (I think I'll leave the negative and > 1 colors for what
they are, I'm happy using the classic range)

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