如何掌握好电视摄像白平衡的调整

How to Master White Balance Adjusting in Television Shooting

在电视摄像中 ,照明条件不断改变 ,为了使所拍摄物体的色彩正确还原 ,在拍摄前应对摄像机进行白平衡调整 ,将不同光源条件下白色物体的入射光在摄像机内部进行色温变换 ,等效为 32 0 0K色温的光图像 ,即经过调整 ,使摄像机在不同光源条件下拍摄的白色物体在摄像管或CCD上输出的图像电信号与R ,G ,B 3路预放器的额定输入相符合 ,使R ,G ,B 3路处理放大器产生的R ,G ,B三基色信号幅度相等 。

In television Shooting, the condition of illumination changes frequently. To make the color of recorded objects restore rightly , the white balance of television camera should be adjusted before shooting, making the light of white objects under different illumination do color temperature changing in inner television camera , equating 3 200 K color temperature's light image . That's to say , the electric signal of image , which is output from camera tube or CCD by the white objects recorded under different illumination fits the effective input of the three R,G,B preamplifier , to make the three basic R,G,B colors' signal range equal and achieve white balance.