What do you mean by the purity and lightness of colors in gouache painting and the saturation of the picture?

The purity of color, also known as saturation and chroma, is a standard used to express the lightness and depth of color. The higher the purity of a color, the brighter it will be, and if the purity decreases gradually, it will become darker and darker. The purest color is the primary color, and the lowest color will become achromatic color. From the visual effect, high-purity color is easy to cause visual stimulation because of its bright and gorgeous colors; The medium purity tone is plump and soft, which can keep people's vision staring for a long time; Low-purity tones are monotonous and attractive, which makes people associate more easily.

In the process of creation, we should learn to use and change the purity of color according to the actual situation. Generally speaking, there are four common methods to change color purity: adding white, adding black, adding gray and adding complementary colors. That is to say, if white, black or complementary colors are added to the primary colors, the purity of the colors will decrease. One more thing, we should pay attention to distinguish the purity of color from the lightness of color. The high purity of color refers to bright colors rather than very bright colors. For example, we should draw a tree in the yard with red apples on it. At this time, the color of the red apple in the picture is darker than the background, but purer than the background.

In addition, we should know that when the purity contrast of different colors is strong, it will give people a stiff, messy and exciting feeling; If the purity contrast is insufficient, it will cause pink, dirty, gray, stuffy, fuzzy and monotonous feelings. In creation, we should start from the inherent color of the object and give appropriate arrangements according to its height, distance and priority.