Scroll down to related links and look at "Brightness - Wikipedia".
When blood cells have oxygen they are red, when they have no oxygen they are a darker shade of red.
No most people have no control over physiological functions like sight. Color and intensity are actually seen by a different type of nerve in the eye. Color is seen using nerves called cones and intensity (monochrome) is seen with nerves called rods. People that are color-blind have a deficiency in the cones. But having said that it may be possible to be hypnotised to not recognise color.
The opposite of a cool color is a hot color and red and orange is usually one that comes to mind.
It is bright red in color .
Puce
The color associated with wrath is typically red or black, representing anger, intensity, and danger.
strong red (crimson)
The color red can evoke feelings of passion, excitement, and energy. It is also commonly associated with warmth and intensity.
How does intensity apply to color?
INTENSITY!!!!!!!!!!!!
There are two colors of light that, when mixed, produce the color orange. These two colors are high-intensity red and low-intensity green.
If the question is how to decrease the intensity of the color red in wet media like paint one method is to use a small amount of the opposite color (in this case green) to decrease the intensity. Depending on the red, cadimium can mix with earth tones, but a red like alizarion will tone down with some cool yellow or blue. For the most part it really depends on the type of media and the type of pigments. Having a working knowledge of the color wheel and transparent and opaque pigments, along with experimentation is the best way to find the right mix.
Hue: The actual color of an object, such as red, blue, or green. Saturation: The intensity or purity of a color, ranging from vibrant to dull. Value: The lightness or darkness of a color, which helps create contrast and depth.
intensity
Seeing as red and blue mixed together makes purple, red and purple mixed together would make a magenta or mauve, depending on the intensity and amount of red and purple involved. Depending on the amounts you mix them in; some shade of red-violet or red-purple. A tertiary color.
Violet and controlled amounts of white should give you lilac. You can increase the intensity of the color by adding blue or red.
There is no relationship whatsoever. There are puny lights in both red and violet, and there are overpowering ones of each color too.