Adjust color white balance selectively for blacks and whites. This filter operates in YUV colorspace.

The filter accepts the following options:

rl

Set the red shadow spot. Allowed range is from -1.0 to 1.0. Default value is 0.

bl

Set the blue shadow spot. Allowed range is from -1.0 to 1.0. Default value is 0.

rh

Set the red highlight spot. Allowed range is from -1.0 to 1.0. Default value is 0.

bh

Set the blue highlight spot. Allowed range is from -1.0 to 1.0. Default value is 0.

saturation

Set the amount of saturation. Allowed range is from -3.0 to 3.0. Default value is 1.

analyze

If set to anything other than manual it will analyze every frame and use derived parameters for filtering output frame.

Possible values are:

• manual
• average
• minmax
• median

Default value is manual.