Samsung SDP-9000DXR User Manual page 30

Adjusting your image with GUI
Red / Blue
Allow to adjust image color through the red/blue gain control
Holding down [Up]/[Down] menu with the left mouse button, red/blue gain control is activated.
AWC
Allow to adjust image color automatically through automatic white balance control
Click [AWC] menu with the left mouse button, AWC function is executed once.