How to enable Custom AWB white balance using libcamera-still on the Raspberry Pi

libcamera-still -n 1 --width 4056 --height 3040 -o test.jpg --awb custom --awbgains 0.9,2.0

In --awbgains 0.9,2.0 , 0.9 is the gain for the red channel and 2.0 is the gain for the blue channel.

In other words, if your image is:

  • too red -> decrease the first number
  • too blue -> decrease the second number
  • too yellow -> increase the second number (blue)
  • too green -> increase both numbers
  • etc