This effect keys the layer based on its brightness. This is commonly used to remove black or white backgrounds, and can also be particularly useful for sky replacement.
- Key Type: Luminance Key can remove either end of the luminance range. Select the type which will be used.
- Key Out Brighter: Removes the brightest tones, leaving the darker areas.
- Key Out Darker: Removes the darkest tones, leaving the brighter areas.
- Threshold: Sets the tonal value which marks the limit of the key. Tonal values on one side of the threshold are retained, and values on the other side are removed.
- Tolerance: Softens the transition surrounding the threshold. Higher values create a more gradual transition between the areas which are removed and the areas which are retained.
- View Matte: Toggling this option displays the matte on the viewer, as a grayscale image where White is completely retained, and black is completely removed. This can be useful for identifying problem areas which may need further adjustment.
- Brightness Used: Select the channel that will be used to determine the luminance values which the effect will process. Choose between Intensity, Lightness, or Luminosity.