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You can use this effect to create pop-art like effects by enabling you to fully control the posterization and the amount by which the effect is applied for each separate channel.
Red bias -
Determines the bias of the red channels' posterization. Any pixel
whose red channel is brighter than the given bias will become fully
red, any darker will become black.
Red amount - Sets the amount by which to mix the red channels' posterization with the actual pixels' red channel.
Green bias - Determines the bias of the green channels' posterization. Any pixel whose green channel is brighter than the given bias will become fully green, any darker will become black.
Green amount - Sets the amount by which to mix the green channels' posterization with the actual pixels' green channel.
Blue bias - Determines the bias of the blue channels' posterization. Any pixel whose blue channel is brighter than the given bias will become fully blue, any darker will become black.
Blue amount - Sets the amount by which to mix the blue channels' posterization with the actual pixels' blue channel.