Corrects all colors using the reference point in the image.
If, for example, you shoot a video under poor lighting conditions
and it turns out a bit reddish, you can automatically
correct the colors to normal values.
All that is required is to record a white rectangle somewhere (you
can record a piece of white paper while shooting the video) under
the same conditions. Then in the preview window of this function
click on the white area that you recorded (even though it may look
White Balance will then calculate how different is the recorded
white area from the pure white color, compute the necessary
correction factor and adjust all the colors in the video using this
value. After the White Balance does its job, the area you selected
should become white, and all other colors in the video should look