Setup Controls

Use the Setup controls to adjust the setup options.

Note: You can change the settings in the Setup controls at any time. For example, you do not have to apply the key-in blur before you start keying. You can attempt to pull the key, then apply a key-in blur only if you find that it is needed.

Key In

The Key In controls affect the source for the keying operation.

Source

Determines which image to use to set the key. By default, the key-in source is the front image. To use a different image, click the Source button and select an operator from the dialog that appears. This is useful if the blue screen contains artifacts. See Keying Uneven Blue Screens.

Blur

Applies a blur filter to the key-in source. This is useful when the blue screen is grainy. Click the Key-In Blur button to enable the blur, then set the blur width and height. These values determine the number of adjacent pixels used to blur each pixel. A Gaussian blur is used by default, but you can change the type to a Box blur in the Filter Type list.

Setups

Use these controls to import and export setups from Discreet's SGI-based products, as well as setups created in other combustion workspaces.

Import

Imports Keyer setups. Click Import, navigate to the location of a saved setup file, select the file, and then click Open. The imported setup is applied to the current Keyer.

Export

Exports Keyer setups. Click Export, navigate to the location where you want to save the setup file, enter a file name, and then click Save. The current Keyer setup is saved.

Colors

Use these controls to customize the Comp background and the Plot bar colors.

Comp

Determines the color of the solid background used when the output is set to Comp. To change the color, click the color box and select a color using the Pick Color dialog that appears. For more information on the Comp Output, See Output Options.

Plot Bar

Determines the color of the bar that appears when you plot a color in the Key, Curves, or Color controls.

Miscellaneous

The following controls are also available.

Composite Operation

Use Punch Back with computer graphics (CG) images in which the area to be keyed out is pure black. Use Blend if the color to be keyed out is not pure black (most digitized footage).

Filter Type

Determines the type of blur used when you apply a matte blur (in the Matte controls) or a key-in blur. It also affects the Shrink and Erode operations:

• A Box blur blends each pixel with adjacent pixels in the X and Y directions.
• A Gaussian blur performs sub-pixel blending based on all surrounding pixels. It creates a smoother effect but is more processing intensive.

Guess Key Color

Enable this option for combustion to guess the key color when you first apply the Keyer operator.

Output Matte As

Use this control to determine how the output of the Keyer is used in the composite.

Key

Outputs the matte as a key; in other words, the matte determines which parts of the keyed image are transparent.

Selection

Ouputs the matte as a selection. When you choose Selection, the Invert option appears.