Commands
The filter supports the following commands:
- 'contrast'
-
Set the contrast expression.
- 'brightness'
-
Set the brightness expression.
- 'saturation'
-
Set the saturation expression.
- 'gamma'
-
Set the gamma expression.
- 'gamma_r'
-
Set the gamma_r expression.
- 'gamma_g'
-
Set gamma_g expression.
- 'gamma_b'
-
Set gamma_b expression.
- 'gamma_weight'
-
Set gamma_weight expression.
The command accepts the same syntax of the corresponding option.
If the specified expression is not valid, it is kept at its current value.