2017

TIP As a reference, when setting softness and tolerance ranges, you can display the colour value for any pixel in
the key-in clip using the Plot tool. You can then adjust the tolerance or softness range so the pixel falls within one
of the ranges. For example, plot pixels at the edges of the matte to check for softness, or plot pixels in the
background to check for tolerance.
To plot a pixel's colour values:
1 Click Plot.
The cursor changes to a colour picker.
2 Select a pixel in the image area.
A red bar appears in each colour gradient showing the colour value of the pixel.
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.
NOTE When 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.
Refining Your Key
Adjusting the Luminance of the Key
After creating a key, you can adjust luminance values to fine-tune the result. The 2D Histogram node in the
schematic displays the distribution of luminance values within the matte. The horizontal axis of the histogram
Creating a Key by Setting the Luminance | 701