Web color: Three elements of color

Visual perception of all color image, all have lightness, hue and purity three kinds of nature, these three kinds of nature is the most basic element of color.

Lightness

In the absence of color, the highest brightness of the color is white, the lowest brightness of the color is black, there is a light from the dark gray series. In the color, any kind of purity has its own lightness characteristic. For example, yellow is the most obvious color, in the center of the spectrum, purple is the lowest color, at the edge of the spectrum, a color object surface of the greater the light reflectivity, the degree of visual stimulation, the more the brighter, the higher the brightness of the color.

Lightness in the three elements of a strong independence, it can be without any hue characteristics and through the relationship between black and white ash alone presented. Hue and purity must rely on a certain amount of light and light to appear, once the color occurs, the light and dark relationship will appear at the same time, in our process of sketching, we need to have the color of the object of the relationship between the light and dark tones, which requires a sharp sense of light and shade. We can think of this abstract degree of relationship as a color skeleton, which is the key to color structure.

Hue

Hue refers to the appearance of color. In the visible spectrum, people's vision can feel red, orange, yellow, green, blue, purple these different characteristics of color, people give these can distinguish between the color of the name, when we call to one of the color name, there will be a specific color impression, this is the concept of hue. It is precisely because the color has this kind of concrete appearance characteristic, we can feel a colorful world.

If the description is the color of the secret skeleton, hue is very similar to the color appearance of the gorgeous skin. Hue embodies the outward character of color, is the soul of color.

In the visible spectrum, red, orange, yellow, green, blue, purple each hue has its own wavelength and frequency, they from short to long in order, like the order of the musical scale, order and harmony, nature occasionally will this spectral secret to us, that is the rainbow after the rain. It is the most beautiful scene in nature, the hue of the spectrum emits the original brilliance of color, they constitute the basic hue of the color system.

Purity

Purity refers to the intensity of the color, depending on the wavelength of a single color. Our vision can recognize the hue of the color, have a certain degree of brightness, for example, green, when it mixed with white, although still has the characteristics of the green phase, but its brightness decreased, the brightness increased, become pale green, when it mixed with black, the brightness of the lower, the brightness darkened, become dark green; When mixed with the green brightness similar to the neutral ash, its lightness has not changed, the purity is reduced, becomes the gray green.

Different hue not only the brightness, purity is not equal, such as the highest purity of the color is red, yellow purity is also higher, but the green is different, it's almost half the purity of the red.

In human vision can feel in the range of colors, the vast majority of the color is not high purity, that is, a large number of gray color, with the change in purity, so that color is extremely rich.

Purity embodies the color of introverted character. The same hue, even if the purity of a slight change, will immediately bring the change in color character.