The contrast level, used with the lightening
parameter.
The brightness level. The value ranges from 0.0 (original) to 1.0.
The redness level. The value ranges between 0 (original) and 1. This parameter adjusts the red saturation level.
The sharpness level. The value ranges between 0 (original) and 1. This parameter is usually used to remove blemishes.
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Image enhancement options.