User Manual

Table Of Contents

Post-Multiply Image

Select this option to cause the keyer to multiply the color channels of the image against the

Alpha channel it creates for the image. This option is usually enabled and is on by default.

Deselect this checkbox and the image can no longer be considered premultiplied for purposes

of merging it with other images. Use the Subtractive option of the Merge node instead of the

Additive option.

For more information on these Merge node settings, see Chapter 32, “Composite Nodes” in the

Fusion Studio Reference Manual or Chapter 80 in the DaVinci Resolve Reference Manual.

Common Controls

Settings Tab

The Settings tab in the Inspector is also duplicated in other Matte nodes. These common

controls are described in detail at the end of this chapter in “The Common Controls” section.

How to Key with Primatte

You begin keying with Primatte by connecting the blue- or green-screen shot to the orange

foreground input on the Primatte node and the background shot for the composite into the

green background input. Once the connections are made, there are four main steps to using

the Primatte:

1 Select Background Color.

2 Clean the Background noise.

3 Clean the Foreground Noise.

4 Remove Spill.

Selecting Background Color

 In the Inspector, click the Select Background Color button.

 Position the mouse pointer over the blue/green-screen area in the viewer, somewhere

near the foreground subject.

 Drag over the background color.

Primatte averages the pixels to get a single color. Sometimes Primatte works best when

only a single pixel is sampled instead of a range of pixels.

Should you have difficulties with your keying, try the Select Background Color

operation again with a single dark screen pixel or single light screen pixel.

Instead, If you want to make a rectangular selection, use the Box button in the top

left-hand corner of the viewer. The Median button is the same as Line selection, except

that each point sampled is the result of a 3 x 3 region based on where you click and

then apply a median filter. This can potentially reduce any noisy pixels.

Primatte viewer buttons

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