How the light ratio is measured in photography and how the results are applied in photography

1. The calculation of the light ratio, first of all, is to measure the light, you can first measure the light in the bright place, and then measure the light in the dark place, and the difference between the values can be calculated to calculate the light ratio, for example, the bright place is f8 125 tenths of a second, the dark place is f4 125 seconds, and the light ratio difference is 2 gears.

2 multi-**, refers to a ** many times **, depending on the machine, usually there is a button, press it can be carried out many times**, I don't know what machine you use?

3. Bracketing** is the mode of metering.

Kiss! The use of photographic and photographic light ratio is as follows: First, in portrait photography, the light ratio is the quantification of the light intensity of the highlight and shadow parts of the portrait, and the optimal ratio is 4:

1 or 5:1 is the appropriate local light ratio for low-key portrait photography, which can range from 45° to 70° in the front side light depending on the subject. Understand the relationship between the camera and the pivot angle of the subject.

In the second step, in portrait photography, the contrast between the light ratio and the opening belt can well express the inner character of the character. In landscape photography and product photography, the texture of high contrast is hard, and low contrast is bland and soft. The third step, the same way, the effect of the light ratio is reflected in the picture, the light ratio is large, the shadow tone is hard, the layers are less, the three-dimensional sense is strong, and the contrast is large.

The light ratio is small, the shadow tone is soft, the layers are rich, the three-dimensional sense is weak, and the contrast is small. In the fourth step, the photographer finally uses the light ratio to create, which can be combined with the effect of the large and small light ratio to highlight the subject and highlight the subject. I sincerely hope that you will be healthy and all the best!

Because of the light, the picture produces light and shade, layers, lines and tones. In the previous article, we talked about shooting effects with different light quality and light level.

What is Light Ratio?

The light ratio refers to the ratio of light to the dark and bright parts of the scene in photography.

When the object is illuminated by light, it produces a change of light and dark. Due to the different angles of light, the different distances between the light source and the object, and the different textures of the objects, they will all produce different sensations of light and dark tones. People summarize the law of light and dark tones of objects as "three sides and five major tones".

If you haven't heard of it, you can learn the basics of sketching).

The three major sides are the light side, the gray side, and the dark side.

After the object is irradiated by light, it presents different light and shade, the side that receives light is called the bright side, the side that receives light is called the gray side, and the backlit side is called the dark side. That's the three sides.

The five keys are: highlights, highlights, the dividing line between light and dark, shadows, and reflections.

Formation of light ratio – primary light and fill light.

The formation of the light ratio is mainly produced by the main light and the auxiliary light.

In portrait photography or still life photography, the main light is generally used as a modeling light or contour light, which can outline the shape and contour of the object.

The main function of the fill light is to improve the quality of the dark part of the picture, increase the level and detail of the dark part, and reduce the light ratio of light and dark in the picture. When shooting on location, the reflector that everyone often sees is used as a fill light.

In a single picture, there can only be one main light, and there can be many auxiliary lights.

The effect of light ratio on the picture.

In order to better control the contrast of the picture, the photographer introduced the concept of light ratio. The different ratios of light on the dark and light sides create different visual effects.

The light ratio affects the tone of our picture, if the light ratio is large, the contrast between light and dark of the subject is large, the picture appears heavier, the level and color of the subject are more difficult to express, and the details and levels of the dark part will also be lost.

When the light ratio is small, the difference between the light and dark of the subject is not large, the contrast of shadow tone is small, the overall picture tends to be soft, and the small light ratio is easy to show the level and color of the subject.

If you want to make the skin tone of the subject more natural and the picture more soft when shooting portraits, you can use the small light ratio of Lu Zao to express it.

The larger the light ratio, the greater the tonal contrast of the picture, and the less detail, which is usually reflected in the tonality of hard tones, and the smaller the light ratio, the smaller the contrast of the shadow tone of the picture, and the more levels of detail, which are usually manifested as soft or gray tones.

This is the concept of lighting, which is generally the difference between the main and auxiliary lights.

The reason for the light ratio is that the picture is beautiful and the layered effect. Second, it can assist in controlling tolerance.

The forgiveness of color negatives is 7 stops of aperture, so after you have selected the aperture value, you have to make sure that all subjects must match these 7 stops of aperture, which creates a proportional relationship.

According to the aperture, if one light source has an aperture of 1 60s and another light source has an aperture of 1 60s and 4, the distance between the two light sources is 1:4. That is, the difference is one stop multiplied by two.

In the overall lighting, the most important thing is to ensure that the light ratio is uniform in the case of uneven foreground, the picture will be relatively soft, and with more skillful operation, you will slowly know how to control the light ratio of all the pictures to achieve the effect you want.

In portrait photography, the light ratio of the lamp to the lamp is the same distance, the same accessory, and the same power, adjust the output power, such as 1 1-1 2 difference by one stop, that is, the light ratio of 2:1.

Commonly used midtones.

Main light 1 4 output Secondary light 1 8 output Contour light 1 2 output.

The light ratio refers to the difference between the light and dark parts of the subject. If the light ratio is large, the contrast between the bright and dark parts on the subject will be larger, and vice versa. In general, the intensity of the main and fill lights and the distance from the subject determine the light ratio.

Therefore, there are two ways to adjust the light ratio when shooting: adjust the intensity of the main light and the fill light. Increasing the main light intensity or decreasing the fill light intensity will make the light ratio larger; Conversely, the light ratio becomes smaller; Adjust the distance from the main light and auxiliary light to the subject.

Reducing the distance between the main light and the subject or increasing the distance between the auxiliary light and the subject will increase the light ratio, and vice versa.

The basics of light in photography: light quality, light ratio, three-dimensional sense of light. Photography is the art of using light, and the use of light is the basic knowledge that photography has to master.

Light rays can be divided into direct light and scattered light. Different lighting has different effects on the subject.

What are you calculating, get a few lights, a soft umbrella, .Go home and experiment on your own, there is no specific formula.

I want to know, let's look into it.