When you convert videos to black and white, this section becomes enabled, replacing the Hue, Saturation, and Lightness sections. In it you can adjust the grayscale levels, or overall video image lightness on the converted clips.

To change the grayscale levels, use the Lightness sliders to adjust the brightness of the original colors, which are now black and white.
You can also use the tool to target the adjustments on a specific color (shade of gray) in the video image. To do this, click to enable the tool, and then click and (while holding the mouse button down) drag on the color. Drag the mouse up to increase the brightness of the color, or drag it down to decrease it.
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