Matrox MXO2 Guide de l'utilisateur télécharger pdf (Page 158)

138

Chapter 9, Setting Up Matrox Effects with Adobe Premiere Pro

of the Low Gain control as defining a “Transparent to Opaque” range for

keying the dark areas of your foreground image.

•

High Clip This control is similar to Low Clip, except you use it to select

the higher (brighter) luminance values to be keyed.

•

High Gain This control is similar to Low Gain, except you use it to set the

range of luminance values you want to be partially transparent based on the

value set by the

High Clip control. You can think of the High Gain control

as defining an “Opaque to Transparent” range for keying the lighter areas of

your foreground image.

The values you can select using the

Low Clip and Low Gain controls are

dependent on the

High Clip and High Gain controls, and vice versa. This

prevents the low and high controls from keying on the same luminance

values.

•

Mask Allows you to apply a mask to your effect. For more information,

see “Applying a mask to your Matrox effects” on page 102.

•

Transparent Outside Mask Select this option to apply transparency

outside the mask area. This allows you to define a mask area where you want

the keying to be performed, and show only your underlying image outside

the mask. For more information, see “Applying a mask to your Matrox

effects” on page 102.

•

Invert Key Select this to invert the key selection, giving you the opposite

result of what you originally selected

•

Show Key as Output Select this to display the matte used to create your

key effect. This enables you to further refine your key settings. For example,

when you display the matte, areas of your clip that are completely

transparent appear as black, and opaque areas appear as white. If you notice

some white spots that you want to key, you can adjust the key controls until

the undesired white spots disappear.

Using the luma key graph

The luma key graph contains a luminance spectrum and a luminance eyedropper.

You can drag the handles in the luminance spectrum to adjust the

Transparency,

Low Clip, High Clip, Low Gain, and High Gain properties.

Eyedropper

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Matrox MXO2 Guide de l'utilisateur Page 158

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