Kdenlive/Manual/Effects/Colour Correction/SOP/Sat

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This is the FilterFrei0r-sopsat MLT frame work filter. It changes Slope, Offset, and Power of the color components, and the overall Saturation, according to the ASC CDL (Color Decision List) reference

You can use this effect to achieve proper white balance.

See Granjow's blog where he uses the effect to adjust white balance of a clip.