One response to “Painting with Paints & Lights, Glasgow university talk”
2-23-12
Hi Adrien, you’re English is very good. You’re information is very exact, the tools are great. You said, “red and green in pigments averaged to a yellow color”. Red=mmyy, green=ccyy, together red and green equals yymm+yycc, or ymcymcyy. That’s two ymc, subtract them both, yymmcc=neutral, leaving only yy, the yellowish color you saw. Red and green equals brown in pigments, brown is dark yellow.
The way a yellow gets darker in the RGB color space is to subtract light, that tends to add green to the yellow just as it does in pigments by adding black. The opposite of yellow is blue which combines into a greenish yellow. You’re wall lighting shows that the opposite of light red leaves behind the opposite color cyan. An opposition containing yellow light would show a blue after image.
In pigments, yellow darkens to brown before it becomes black (by mixing in its opposite color), ultramarine blue, a secondary color made by combining m+c, into it. You are correct.
Where you were adding light to a wall to even out the lighting we could see what is called the “after effect” that the brain sees after starring at any color. The peach (light red) light producing a cyan after image. http://www.realcolorwheel.com/afterimage.htm
You talked about the underside of a cloud being neutral gray. This gray is made in pigment by using the dark yellow (brown) and it’s opposite color, ultramarine blue. They combine into a neutral black which can be lightened with white to a neutral gray. You are proving that light and pigments are the same color wheel.
About matching sound and color, could you make the sound in the EM Spectrum the same size as the visible color spectrum and superimpose the two? Many people ask me how sound and color match up, that would match them logically.
adrien lucca 
One response to “Painting with Paints & Lights, Glasgow university talk”
2-23-12
Hi Adrien, you’re English is very good. You’re information is very exact, the tools are great. You said, “red and green in pigments averaged to a yellow color”. Red=mmyy, green=ccyy, together red and green equals yymm+yycc, or ymcymcyy. That’s two ymc, subtract them both, yymmcc=neutral, leaving only yy, the yellowish color you saw. Red and green equals brown in pigments, brown is dark yellow.
The way a yellow gets darker in the RGB color space is to subtract light, that tends to add green to the yellow just as it does in pigments by adding black. The opposite of yellow is blue which combines into a greenish yellow. You’re wall lighting shows that the opposite of light red leaves behind the opposite color cyan. An opposition containing yellow light would show a blue after image.
In pigments, yellow darkens to brown before it becomes black (by mixing in its opposite color), ultramarine blue, a secondary color made by combining m+c, into it. You are correct.
Where you were adding light to a wall to even out the lighting we could see what is called the “after effect” that the brain sees after starring at any color. The peach (light red) light producing a cyan after image.
http://www.realcolorwheel.com/afterimage.htm
You talked about the underside of a cloud being neutral gray. This gray is made in pigment by using the dark yellow (brown) and it’s opposite color, ultramarine blue. They combine into a neutral black which can be lightened with white to a neutral gray. You are proving that light and pigments are the same color wheel.
I’m glad that you incorporated the magenta color (secondary light and primary pigment) in with cyan and yellow for your choice of pigments. I’m linking this video into my page on color theory. In pigments I call it the Real Color Wheel.
http://www.realcolorwheel.com/colorwheel.htm
(linked to)
http://www.realcolorwheel.com/RCWcolortheory.htm
About matching sound and color, could you make the sound in the EM Spectrum the same size as the visible color spectrum and superimpose the two? Many people ask me how sound and color match up, that would match them logically.