Matrox Electronic Systems Matrox RT.X2 User Manual download pdf (Page 151)

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Creating a track matte effect

The Matrox track matte effect lets you superimpose one clip onto another using

an animated matte, sometimes called a traveling matte, to determine how the two

clips are composited (keyed). You can use any of the following types of clips as

your matte:

• A grayscale video or graphics clip.

• A graphics clip or graphics sequence with an alpha channel.

• Any clip to which you’ve applied an effect that provides an alpha channel,

such as a Matrox chroma key or 3D DVE.

When using a grayscale clip as your matte, areas of black in the matte create

transparent areas in your foreground clip, areas of white create opaque areas that

prevent the underlying clip from showing through, and gray areas create

semi-transparent areas in your foreground clip.

°To set up a Matrox track matte effect:

1 Place your background clip (underlying image) on the appropriate lower

track in your sequence, such as on the Video 1 track.

2 Place your matte clip directly above your background clip, such as on the

Video 2 track, and apply the

Matrox Source Identifier effect to this clip.

¦NoteThis effect is used only to identify which clip you’re using as the matte

for your track matte effect. If you set up another effect in the same segment

that also uses the

Matrox Source Identifier effect, such as for another track

matte effect or an additional source for a Matrox cube effect, you must assign

a unique ID number to each source clip.

3 In the Effect Controls panel, click the triangle beside Matrox Source

Identifier

to expand the property list, then select a unique ID number for

your matte clip from the

Identify As list, as shown below:

¡ Important Any effect applied to your matte after applying the Matrox

Source Identifier

effect will be ignored. Therefore, if you want to apply an

effect such as a Matrox chroma key or apply motion to your matte using a

Matrox 3D DVE or Adobe Premiere Pro Motion effect, you must apply this

effect before applying the

Matrox Source Identifier effect.

Select a unique ID number

for your matte source

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Matrox Electronic Systems Matrox RT.X2 User Manual Page 151