From: Gregory Ballora <gregballora-AT-sbcglobal.net>
Date: Fri, 26 Mar 2010 09:38:39 -0700
To: puptcrit-AT-puptcrit.org
Subject: Re: [Puptcrit] mixing paint


And of course, you have to include the lighting source in this equation. Indoor lighting isn't "white". In fact, outdoor lighting isn't white much of the time either. So, your colors are going to change depending on where you are.
Greg
On Mar 26, 2010, at 9:23 AM, Brad Shur wrote:

> 
> I'm a big devotee of "Yellow and Blue don't make green" as well, let me try to answer.
> 
> The basic theory is this. We mostly assume that mixing colors works a bit like old-school color printing. Tiny bits of blue and yellow pigment next to each other combine to form green in our perception, just like pointilism.
> 
> But that's not really how pigment works. When we see a secondary color, it isn't the manufactured average from two primaries, it's the secondary color that they were both reflecting some of to begin with when the primaries cancel each other out.
> 
> Pigments make color by absorbing some wavelengths of light and reflecting some. What we see is what they reflect. Every pigment reflects several different wavelengths of light to different degrees. What looks like a solid yellow is almost always reflecting some orange and some green. Since pigments absorb the wavelengths that they don't reflect, real, 100% pure primaries mixed together would actually turn black.
> 
> If I mix a red paint that ONLY reflects red and absorbs everything else with a blue that ONLY reflects blue and absorbs everything else, then the tiny pigment particles, side by side, would each absorb most of what the other is reflecting. The result would be black. You can see this for yourself by mixing an alizarin crimson with an ultramarine blue. You get a purple that is darker than either of your source pigments and very nearly black.
> 
> So, to really have a full palette and be able to mix any color, you need "primaries" that already contain some amount of the secondaries. 
> Use a palette with both an orange-red and a magenta-red, a warm and cool yellow, a greener-blue, and a more purple-blue.
> 
> 
> 
> B. Shur
> 
> 
> 
> 
>> From: robertrogers-AT-robertrogerspuppets.com
>> To: puptcrit-AT-puptcrit.org
>> Date: Fri, 26 Mar 2010 10:21:34 -0400
>> Subject: [Puptcrit] mixing paint
>> 
>> Mathieu,
>> 
>> A while ago, you mentioned that it is not necessarily true that all colors can be derived from mixing white, black, yellow, blue and red.  What do you know that my elementary school art teacher did not?
>> 
>> Robert Rogers
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