Effects > Keyer > 
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. In the Keyer, click Keyer, and then click Luminance.

    The Luminance controls appear.

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

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

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

    NoteYou can reset values in Master Softness and Tolerance fields by clicking the Reset button.