What is white balance

White balance literally means white balance. White balance is an index to describe the white accuracy of the mixed red, green and blue primary colors in the display. White balance is a very important concept in the field of TV camera shooting, through which a series of problems such as color restoration and tone processing can be solved. White balance is produced by the true color reproduction of electronic images. It was used in the field of professional photography earlier, and now it is also widely used in household electronic products (household cameras, digital cameras). However, the development of technology makes white balance adjustment easier and easier, but many users still don't understand the working principle of white balance, and there are many misunderstandings in understanding. It is to realize that the camera image can accurately reflect the color condition of the subject, with manual white balance and automatic white balance. Many people will encounter such problems when shooting with a digital video camera: the images taken in a fluorescent lamp room will appear green, the scenery taken in an indoor tungsten lamp will appear yellow, and the photos taken in the shadow of the sun will appear blue inexplicably. The reason is the setting of white balance.

How to adjust the white balance:

Automatic white balance

Automatic white balance is usually the default setting for digital cameras. There is a complex rectangular picture in the camera, and the white balance reference point in the picture can be determined, thus realizing the white balance adjustment. 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 in tungsten lamp is also called "incandescent lamp" or "indoor lamp". 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 lamp, 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. The fluorescent lamps used in different places are different, so the "fluorescent" settings are different. The photographer must determine what kind of "fluorescence" the light is so that the camera can set the best white balance. Of all the settings, the "Fluorescent" setting is the most difficult to decide. For example, some offices and schools use various combinations of fluorescent types, and the "fluorescent" setting here is very difficult to handle. The best way is to "shoot".

Microphotography

Under the microscope, when light sources with different color temperatures illuminate the sample, CCD will display different colors. This is because the color reproduction distortion of CCD is caused by the imbalance of CCD color signal output under different light. As the default setting of micro-camera, automatic white balance determines the reference point of white balance in the picture through a complex rectangular diagram, thus realizing white balance adjustment. However, as some special cases, manual white balance and regional white balance are needed to prevent color cast. The main method is to move the objective lens of the microscope to the area outside the slide sample.

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. Not all digital cameras have this white balance setting. Generally speaking, the outdoor time-white balance system is in the best state, and these settings are not needed. However, some manufacturers add these special white balance settings to cameras, and the use of these white balances varies from camera to camera.

control manually

This white balance has different names in different places, and they describe some white balance settings under ordinary lighting conditions. Generally speaking, users need to point out the reference point of white balance to the camera, that is, which "white" object is used as the white point in the picture.