Colors have visual weight. It is represented by a closest value. Yellow doesn't appear to have a comparable value to white, so it doesn't. The values of hues is just an inherent property. If you're looking at a pure hue and then looking at it's closest gray and wondering why they don't quite look the same it's because of the chroma shift. They're the same visual weight, just different chroma values.
Originally Posted by neonnoodle
Yellow and greens are at the middle of the visual light spectrum. The problem with color theory and artists is that it bounces back and forth between Optics and Aesthetics. Physically, yellow and green are in the middle. As you move towards red or blue you're "exiting" the band of electromagnetic radiation humans can detect with their eyes. That's probably why yellow seems brighter, it's around the peak of light we can experience. That translates into values when you're painting.
Why does yellow look "bright," red less so, and blue dark?
In it, he says that blue is found in all shadows. He says that blue is an inherent property of low-light conditions. For some reason this seems...not right.
If you're going to paint a subject outdoors on Earth, that's just about right. Again, it's halfway between actual phenomena and perception. The blue light from the sky does effect places where direct light from the sun is blocked. But it's really subtle and how much you exaggerate it depends on your preference. Shadows are supposed to naturally lose chroma since you can't have color without light. Less light, less chroma. Don't take that as a rule though. I'm just speaking in terms of the physical. In a place with no ambient light from the sky, the shadow color would depend on reflected light and what kind of art you're making. You can always add complementary colors to shadows if you want. I'm pretty sure there's a whole movement of art related to playing with color and light and disregarding photorealism.
"Astronomy offers an aesthetic indulgence not duplicated in any other field. This is not an academic or hypothetical attraction and should require no apologies, for the beauty to be found in the skies has been universally appreciated for unrecorded centuries."