Color three primary colors principle and color vision

Color three primary colors principle and color vision:

Basic colors that cannot be blended by any other color are called primary colors. The inside of the human eye has cone-shaped cells, can feel the red, green and blue, although the eyeball is not to red, green, the feeling of the Blues is the strongest, but can feel the widest frequency, can also independently stimulate the three colors of the light body, so red, green, blue Three colors are considered primary colors. These three colours are independent, and none of the primary colors can be mixed with the other two primary colors.

In order not to become blind to the "color blindness", daily life should be attentive to the surrounding color. Color is like food, the same material, because the use of different seasonings, the taste is different, the success of the words is beautiful, failure is difficult to swallow. Color has a great influence on people's psychology and physiology, so color learning is the basic subject of design workers.

When people see color, in addition to be affected by its physical aspects, psychological will also produce corresponding feelings, this feeling is difficult to use words to describe, generally known as color impression.

First, the three primary colors of light

The colors seen by the human eye are caused by different wavelengths of light. After the experiment found that the human eye on the red light, green light and Blu-ray three wavelength of the rays feel particularly strong, as long as the appropriate adjustment of the intensity of the three light. Almost all the colours of nature are felt.

The three colors of the three wavelengths of light, red, green, Blue (blue), are called the three primary colors of the light (RGB). All color screens have light-emitting devices that produce the above three basic rays, so the computer represents each color according to the size of the R, G, b three values. RGB These three color combinations, almost form all colors, each primary color using 8 bit data records, is 28=256, and this is what people often hear 24-bit full-color:

Because the light is getting brighter, 22 can get a brighter middle color after mixing: yellow (yellow), cyan (cyan), magenta (magenta), and add the three primary colors of the light to the same amount, you can get white, as shown in the picture. When a color completely does not contain another color, the two become complementary colors. For example, yellow must be made from red, green, and completely blue, so yellow is known as the complementary color of blue; As you can see from the figure, two complementary colors are separated by white, and if you add them you will get white.

Second, the printing of the three primary colors

The pigments are just the opposite of the light, pigments are the absorption of light, not the enhancement of light, so the printing of the three primary colors (CMY) must be able to absorb red, green, blue color, that is, their complementary colors: cyan (cyan), magenta (magenta) and yellow (yellow), in the concentration of o~100 to express.

Because the yellow pigment absorbs the blue light, the cyan pigment absorbs the red light, the last remaining green light can be obtained through reflection, theoretically, the printing of the three primary colors should be able to absorb all the red, green, blue and black, as shown in the picture, but actually can not find the light absorption, reflective features are perfect pigments, Causes the result to appear dark gray or dark brown. In addition, these three kinds of pigments can not be mixed to produce many dark color colors. In order to compensate for this shortcoming, the printing will be added to the black pigment, in order to solve the problem can not produce pure black, there is a CMYK color mode, K for black.

After you add black, although you can increase the range of printable colors, but also make the color adjustment more complex. For example, each use of 50% concentrations of cyan, magenta, yellow can be mixed into gray, can also be directly using 50% black pigments to produce the same gray. When a color has different mixing method, if add the pigment transparency, the drying speed, the paper absorbs the ink degree and so on the condition, the color control becomes the print quality good or bad key.

Third, the warm color visual effect

1, Red

Red is easy to attract attention, so it is widely used in various media. Besides having better visual effect, it is used to convey the impression and spirit of vigor, positivity, enthusiasm and warmth. In addition, the color is often used as a warning, danger, fire and other signs of color.

2, Orange

The orange is high in color, and is a warning color in industrial safety. For example, the locomotive, mountaineering clothing, backpacks, life jackets and so on often use orange. Because the orange bright dazzling, sometimes will give the person negative, the low price impression, therefore must pay attention to with its color and the expression way in the use, this can play its bright lively characteristic.

3, Yellow

Yellow is high in the color of industrial safety, warning dangerous color, often used to warn danger or alert attention. For example, traffic signs, large engineering machinery, raincoats and rain boots are often used in yellow-orange.