Matrox Electronic Systems Matrox RT.X2 User Manual download pdf (Page 86)

Chapter 4, Setting Up Realtime Effects with Adobe Premiere Pro

255 represents white. Intermediate settings represent different shades

of gray, from very dark to very light gray.

$ Low Gain Use this to set the range of luminance values you want

to be partially affected based on the value set by the

Low Clip control.

As you increase the

Low Gain setting, more luminance values become

partially affected by the color correction.

Low Gain setting of 100 provides the widest range for maximum

color correction. Alternately, a gain setting of 0 creates a key where

the luminance values are either completely affected or left untouched.

You can think of the

Low Gain control as defining an “Affected to

Untouched” range for keying the dark areas of your image.

$ 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 affected

based on the value set by the

High Clip control. You can think of the

High Gain control as defining an “Untouched to Affected” range for

keying the lighter areas of your image.

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

select the higher (brighter) luminance values to be keyed.

¦Note 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.

• 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 define

your selective key region. This enables you to further refine your key.

Areas that are completely affected by the color correction are white,

untouched areas are black, and gray areas are partially affected.

• Expand Outside Mask Applies the color correction settings outside

the mask area. This setting is especially useful when setting up a color

pass effect where you have several objects of the same color but want to

retain the color for only one object. For more information, see “Creating

a color pass effect” on page 84.

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Matrox Electronic Systems Matrox RT.X2 User Manual Page 86