params.use_camera_wb will params.use_camera_wb will force to use As-shot balance params.use_auto_wb will switch to auto-balance params.user_mul[4] allows to use user-specified WB -- Alex Tutubalin @LibRaw LLC reply
params.use_camera_wb will force to use As-shot balance
params.use_auto_wb will switch to auto-balance
params.user_mul[4] allows to use user-specified WB