What is the golden section?

The golden section was first seen in ancient Greece and Egypt. Golden section is also called golden ratio, Chinese-foreign ratio, that is, dividing a line segment into two different lengths, A and B, so that the ratio of long line segment (a+b) is equal to that of short line segment B and long line segment A, and the formula is A: (A+B) = B: A, and the ratio is 0.6 180339 .. This ratio is more pleasing to the eye in modeling, therefore. The golden section rectangle itself consists of a square and a golden section rectangle. You can divide these two basic shapes infinitely. Because its own proportion can stimulate people's vision moderately, and its length proportion just conforms to people's visual habits, it makes people feel pleasing to the eye. The golden section is widely used in architecture, design and painting. In the development of photography technology, the essence of other art categories has been borrowed and integrated to varying degrees, and the golden section has therefore become the most sacred concept in photographic composition. The simplest method used in photography is to arrange 2, 3, 5, 8, 13, 2 1 according to the golden ratio of 0.6 18, so that we can get 2: 3, 3: 5, 5: 8, 8: 13. These ratios are mainly applicable to the determination of the aspect ratio of the picture (for example, the film width of 135 camera is 24mmX36mm, which is derived from the golden ratio), the selection of horizon position, the distribution of light and shadow tones, the division of picture space and the establishment of the visual center of the picture. The trisection (also known as the well-shaped segmentation method) commonly used in photographic composition is the evolution of the golden section method. The length and width of the upper picture are divided into three equal parts, and the whole picture is divided by a pound sign. The intersection of cross-shaped segmentation is the best position of the main body (visual center) of the picture, and it is the most likely visual beauty to arouse people's visual interest. Many basic laws of photographic composition have evolved on the basis of the golden section. However, it is worth reminding that every photo is completely composed according to the golden section, which is unnecessary and impossible. The sameness will make people feel monotonous. Regarding the golden section, it is important to master its laws and use it flexibly.