In the colorful and colorful world, color makes everything in the universe full of emotion and vitality. As one of the most common aesthetic forms, color exists in every aspect of our daily life. Clothing, food, housing, transportation, use, people almost everything, all the time and color have a close relationship. 

Man's feeling is the beginning of understanding. The light and sound of the objective world act on the sensory organs, and through the activities of the nervous system and the brain, we have feelings, and we have an understanding of external things and phenomena.

Color is related to human feeling (external stimuli) and human perception (memory, association, contrast...). Linked together. Color perception always exists in color perception, and there are few isolated color senses. 

People's color perception information transmission way is the light source, color objects, eyes and brain, that is, people's color perception formation of the four elements. These four elements not only make people feel color, but also are the conditions for people to correctly judge color. If one of these four elements is not true or changes in observation, the color and the effect of the color cannot be correctly judged. 

The radiant energy of the light source and the reflection of the object belong to the category of physics, while the brain and eyes are the content of physiological research, but color is always based on physics, and the color feeling always contains the reflection of the psychological and physiological effects of color, which makes people produce a series of contrast and association.

The colorimetry Committee of the Optical Society of America has defined color as: color is a property of light other than spatial and temporal inhomogeneity, that is, the radiation of light can stimulate the retina and cause the observer to obtain the scene through vision.

In our national standard GB5698-85, color is defined as: color is the visual characteristics caused by light on the human eye in addition to the image. According to this definition, color is a physical stimulus acting on the visual characteristics of the human eye, and the visual characteristics of people are dominated by the brain, and it is also a psychological reflection.

Therefore, color perception is not only related to the original color characteristics of the object, but also affected by time, space, appearance state and the surrounding environment of the object, but also affected by various factors such as each person's experience, memory, perception and visual sensitivity. 

Color is derived from nature, but humans combine the inspiration of natural colors with natural or artificial colors to make our lives more colorful. 

Color mixing

A: Primary color theory three primary colors, the so-called three primary colors, means that any one of these three colors can not be produced by the other two primary colors mixed, and other colors can be mixed by these three colors in a certain proportion, color science will be these three independent colors called three primary colors. 

B: Color mixing theory Color mixing is divided into addition mixing and subtraction mixing, color can also be mixed after entering the vision, called neutral mixing.

To understand and use color, we must master the principles and methods of color induction and finishing. One of the most important is to master the properties of color.

Color can be divided into two categories: no color and color. The former is black and white. Gray, the latter like red, yellow. Blue and other colorful. 

To have color is to have a certain or certain hue on the spectrum, collectively referred to as color tones. On the contrary, without color there is no tone. 

No color has light and dark, manifested as white and black, also known as tone. The color representation is complex, but can be determined by three sets of characteristic values.

One is the hue, or hue; The second is light and shade, that is, brightness; The third is color strength, that is, purity and chroma. Brightness and chroma determine the state of color. Three attributes called color. The combination of brightness and hue into a second-line color state is called hue. Some people understand lightness as hue, which is not comprehensive. 

brightness

When it comes to lightness, it is appropriate to start with a colorless hand, because colorless has only one dimension and is much more argumentative.

The brightest is white, the darkest is black. As well as different degrees of gray between black and white, all have the performance of light and dark intensity. If divided according to a certain interval, it constitutes the scale of light and dark. Color depends on its own brightness value, but also by adding or reducing ash, white tone to adjust the light and shade.