Action: Flat Curve
		Make adjustment layer
			Using: adjustment layer
			Type: curves
			Adjustment: curves adjustment list
			curves adjustment
			Channel: lightness channel
			Curve: point list
			point: 0, 127
			point: 255, 127
			curves adjustment
			Channel: a channel
			Curve: point list
			point: 0, 128
			point: 255, 128
			curves adjustment
			Channel: b channel
			Curve: point list
			point: 0, 128
			point: 255, 128
		Group