User Manual

Basic Node Setup
The Luma Keyer takes an input from an image with significant luminance difference to extract a
key. You can then use the output of the Luma Keyer into any mask input.
A Luma Keyer output connecting into an effect mask on a Merge node
Inspector
Controls Tab
The Controls tab in the Luma keyer contains all the parameters for adjusting the quality of
the matte.
Channel
This menu selects the color channel used for creating the matte. Select from the Red, Green,
Blue, Alpha, Hue, Luminance, Saturation, and Depth (Z-buffer) channels.
Threshold
This range slider sets the lower threshold using the handle on the left and sets the upper
threshold using the handle on the right. Adjusting them defines a range of luminance values to
create a matte.
A value below the lower threshold setting becomes black or transparent in the matte.
Any value above the upper threshold setting becomes white or opaque in the matte.
The values within the range create a grayscale matte.
Chapter – 98 Matte Nodes 2163