3. What are the three kinds of sidelights in photographic light? What is the difference?

Front-side light is called front-side light when the light is emitted from the front of the subject and forms an angle of about 45 degrees with the subject. This light is more in line with people's daily visual habits. Under the irradiation of the front light, most of the subject is illuminated, and the projection falls on the inclined side, which is obvious in contrast, and the proportion of light and dark surfaces is moderate, which can better express the three-dimensional shape and surface texture of the subject.

This light is widely used in people's photography. When in use, the front light can be the main light and the front light can be the auxiliary light, so as to achieve the effects of clear outline lines, rich tone levels and harmonious contrast between light and shade, thus better expressing people's appearance characteristics and inner feelings.

2. Front light

When the light forms an angle of about 90 with the object being photographed, it is called positive side light. Under the illumination of positive light, the projection falls on the side, and the light and dark tones of the scene account for half, which can highlight the three-dimensional sense, surface texture and spatial depth of the shooting scene and has a good modeling effect. special

When shooting reliefs, stone carvings, water lines, deserts and various objects with rough surface structures, we can obtain obvious textures by using front side light. If the landscape photo is shot with positive light, the picture is rich in layers and has a strong sense of three-dimensional and space. If the contrast of scene light is too large, we should pay attention to the adjustment of picture contrast.

Generally speaking, the 90-degree side light is not suitable for portraits, because the positive side light will make people's faces form a half-bright and half-dark yin and yang face, which is very unsightly. But sometimes the positive side light can also better express the personality characteristics and mental outlook of the characters.

3. Taillight

When the light forms an angle of about135 with the subject, it is called backlight. At this time, the subject 1/3 area is illuminated, and 2/3 area is in darkness, with strong contrast between light and shade, and the projection is expressive, which can show the outline of the subject.

Extended data

(1) The main light can be hard light or soft light. Strong light can make the tone clear. Soft light can make the tone soft and rich.

(2) The main light has no fixed light level, which is based on the purpose of creating an inverted triangular light block. When the triangular light block is facing the camera, people's faces will be very thin and have a strong three-dimensional sense. And pay attention to block the light to prevent the camera from entering stray light.

(3) It is difficult to control the light ratio of triangular light: In order to control the light ratio of bright and dark areas with auxiliary light or reflector, the light ratio of shooting women is generally controlled at around 1 to 4, and that of shooting men is controlled at 1 to 16. Of course, the appropriate light ratio should be selected according to the color tone of the picture and the tolerance of the camera.

(4) The most important difficulty in the application of triangular light is to balance the eyes in the shadow. It is necessary to use a reflector or an auxiliary lamp to supplement the dark part and form a vision.

(5) For models with poor three-dimensional sense of nasal bone and eyebrow bone, triangular light should be used carefully, which can not only reflect the light beauty of the subject, but also expose and exaggerate the shortcomings of the subject.

Baidu encyclopedia-sidelights