What are the modes of camera white balance?

The concept of color temperature is an important part of photography, and the light source is always defined according to its color temperature. The following is the knowledge about white balance of digital camera that I carefully recommend for you. I hope it will help you.

White balance mode automatic white balance

Automatic white balance is usually the default setting for digital cameras. This kind of automatic white balance has high accuracy, but when shooting in light, the effect is poor, and on cloudy days, many automatic white balance systems have poor effects, which may lead to blue.

Tungsten light-white balance

White balance of tungsten wire is also called. Incandescent lamp or something? Indoor light? . This setting is usually used in an environment illuminated by a light bulb (such as home). When the white balance system of the camera knows that it will shoot in this environment without flash, it will start to determine the position of the white balance. When taking photos indoors without a flash, you must use it.

Fluorescent white balance

It is suitable for white balance adjustment under fluorescent light, because there are many kinds of fluorescence, such as cold white and warm white, so some cameras have more than one kind of white balance adjustment. Different places use different fluorescent lamps, so? Fluorescent? The settings are also different. The photographer must decide what kind of lighting to use. Fluorescent? So that the camera can set the best white balance. Of all the settings? Fluorescent? The setting is the most difficult to decide. What's the best way? Shoot? .

Indoor white balance

Indoor white balance, or cloudy or cloudy white balance, is suitable for adjusting the light in the dark to the primary color state.

control manually

Manual white balance adjustment mode is required under light conditions beyond the automatic white balance adjustment range. Before manual adjustment, you need to find a white reference object, such as pure white paper. Some cameras have a white lens cover, which can adjust the white balance. The operation process is roughly as follows:

1, adjust the zoom lens of the camera to the widest angle (short focal length position);

2. Cover the lens tightly with a white lens cover (or white paper);

3. Adjust the white balance to the manual position;

4. Aim the lens at the clear sky, be careful not to face the sun directly, and zoom in until the whole screen turns white;

5. Press the white balance adjustment button until the manual white balance sign in the viewfinder stops flashing, and then the manual white balance adjustment is completed.

In addition, as mentioned above, the white balance is closely related to the surrounding light, so the use of the flash will be restricted when the white balance function is started, otherwise the change of ambient light will invalidate the white balance or interfere with the normal white balance.

How it works White balance is a very abstract concept. The most popular understanding is to make the image of white still white. If white is white, then the images of other scenes will be close to the color perception habit of human eyes. The process of adjusting white balance is called white balance adjustment. There are generally three ways to adjust the white balance of equipment in the early stage: preset white balance, manual white balance adjustment and automatic tracking white balance adjustment. Usually, according to the procedure of white balance adjustment, press the white balance adjustment switch, the white balance adjustment circuit starts to work, automatically completes the adjustment work, and records the adjustment results. If you master the working principle of white balance, it will be more targeted and handy to use.

White balance works like this: there are three CCD electronic coupling elements in the camera, which feel blue, green and red light respectively. By default, the electronic magnifications of these three photosensitive circuits are the same, which are all 1: 1: 1. The adjustment of white balance changes this proportional relationship according to the adjusted scenery. For example, the ratio of blue, green and red light in the adjusted scene is 2: 1: 1 (the blue light ratio is high, and the color temperature is high), then the white balance adjustment ratio is 1: 2: 2, and the obvious blue ratio in the adjusted circuit amplification ratio is reduced, while the ratio of green and red is increased, so that the adjusted scene is photographed by the white balance adjustment circuit. That is to say, if the adjusted white is a little blue, then the white balance adjustment will change the normal proportional relationship, weaken the amplification effect of the blue circuit, increase the ratio of green to red, and make the image still white.

Think about the adjustment of white balance in another way. Will the camera be out of the tolerance range of white balance adjustment? Refuse? The adjusted scene is placed in front of the lens, which means that the lens can adjust the white balance for any scene. In most cases, the white palette (card) is used to adjust the white balance, because the white palette (card) can most effectively reflect the color temperature of the environment. In fact, in some cases, the whiteboard (card) is not white, but more or less blue or other colors. Experienced photographers will also use the blue sky to adjust the white balance, so as to get a picture with red and yellow tones. After understanding the working principle of white balance, we will boldly try different effects when using it again, which enriches the camera creation.

The English name for adjusting the White Balance of a camera is White Balance. The color of the object will change due to the color of the projected light, and the photos taken under different light conditions will have different color temperatures. For example, a photo taken under the illumination of tungsten lamp (light bulb) may be yellow. Generally speaking, CCD can't automatically correct the change of light like human eyes. The following pictures show different images under different colors of light.

The picture uses natural light. After white balance, the image is blue. If white balance is used in light, the color of the picture will return to the primary color state. White balance will immediately adjust the intensity of the red, green and blue colors of the whole image according to the characteristics of the image in the current portrait, and correct the errors caused by external light. Some cameras provide manual white balance adjustment in addition to automatic white balance or specific color temperature white balance function.