How to adjust the white balance of live TV programs? The most professional method of adjusting white balance in photography.

At the scene of "Hero of Mai Ba" on Zhejiang TV Station, half an hour before the live broadcast, it was "white adjustment" (short for their adjustment and calibration of white balance). There are always more than a dozen cameras at the scene, so all neon lights, color lights, exhibition boards and audience's mobile phones are turned off, and the cameras turn off the flash, leaving only the main light of the stage-ultra white light (the color temperature measured by my camera is about 4 100K, which is more accurate). Then let people take a piece of wood about 100cm*80cm, cover it with a layer of white paper (ordinary 1 is enough, ordinary white paper), and then stand in the center of the stage and rotate around. Each camera calibrates the white balance of the board and determines the shooting exposure parameters. In fact, an ordinary piece of white paper is enough, and any white balance board, white balance mirror, white balance cardboard, white balance cloth and white balance auxiliary equipment are redundant. Looking at the professional TV recording scene, a piece of common white paper can correct the white balance. Uh-huh, handkerchief paper is the most convenient in the future. In fact, the reflection of handkerchief paper is not strong, but that of white paper is stronger. Maybe more accurate.