Canon PowerShot S120 Manual (en)

You can adjust white balance using a selected part of an image as the 
standard for white to make the image appear natural. Using click white 
balance is effective when using it in parts of an image where white color 
tone has changed under the influence of a light source.
Click on a point that is to be the standard for white.
Adjusting Color Tone Using Click White Balance
The coordinates of the cursor position and 
the RGB values (8-bit conversion)
Reverts the 
image to the 
original settings
The color of the image is adjusted with the point you selected as 
the standard for white.
If you click on another point in the image, the white balance is 
adjusted again.
To finish click white balance, click the [
] button again.
When there are no white areas in your image, you can adjust the white 
balance by clicking on a grey point of the image in step 2. This has the 
same adjustment result as selecting a white area.
When there are no white areas in your image
You cannot change or adjust white balance with multiple-exposure 
RAW images created on the camera.