Chroma Keying and Working with Green Screens >

# Creating a Key by Setting the Luminance

You can create a key using only the Luminance channel. The softness and tolerance values are expressed as percentages.

This technique is useful for clips with high contrast or filmed against a black background. You can also use the Luminance channel to adjust a matte that has already been rendered. Load the matte as the key-in clip, and then adjust it in the Luminance menu.

NoteWhen you load a matte as the key-in clip and open the Luminance menu with default menu values, the resulting Keyer matte is identical to the original matte.

To create a key by setting the luminance:

1. From the Start Mode dropdown list, select Reset to Luminance and click Confirm.

   The Luminance Keyer processing pipeline is displayed in the schematic view.

2. Double-click the Luminance Keyer node.

   The Luminance controls appear.

   (a) Master Tolerance field(b) Master Softness field

3. Set the softness in the Master Softness field.
4. Set the tolerance in the Master Tolerance field.

   A value of 100 for the tolerance creates an entirely opaque matte.

#### Related Information

- Chroma Keying and Working with Green Screens