BCC Composite Choker

Category: BCC Key and Blend

Effect Name: BCC Composite Choker

The BCC Composite Choker filter, part of the BCC Key and Blend category, contracts or expands the edges of the matte to bring them closer to or farther from the foreground. Two Choke controls allow you to smoothly adjust the matte.

Working with the Filter

Presets and Common Controls

• BCC filters come with a library of factory installed presets plus the ability to create your own custom presets and preview them with the BCC FX Browser™.
• BCC filters also include common controls that configure global effect preferences and other host-specific effect settings.

For more information about working with presets and other common controls, Click Here.

Effect Controls

Compare Mode

The Compare Mode is used to view the filtered result alongside the original source layer. Several split-screen and side-by-side display options are available.

For more information, see Compare Mode.

• Choke 1: Applies a choke to the image. Positive Choke values tighten the matte around the foreground image, while negative values pull the matte away from the edges of the foreground image.
• Output: TDetermines how the filter uses the two Choke values to composite the filter, which enables you to adjust the matte more precisely.
• Choke 1: Uses the Choke 1 value and ignores the Choke 2 value.
• Mix: Blends the two Choke values to alter the alpha channel.
• Difference: Uses the difference between the two chokes, creating an outline effect.
• Subtract Difference: Uses the difference between the original alpha channel and the difference between the two Choke values.
• Choke 2: Uses the Choke 2 value and ignores the Choke 1 value.
• Choke 2: Applies a second choke to the image which you can mix with the first choke using the Output setting.
• Post Blur: Blurs the alpha channel after the matte is processed. Use Post Blur to soften the edges of the matte for sources with high-contrast edges. You might also want to add Post Blur when using Difference or Subtract Difference output modes.
• Blur Quality: Sets the quality of the blur applied in the filter.
• Gaussian Low: A fast, low intensive blur.
• Gaussian Medium: A medium intensive blur.
• Gaussian High: A high quality blur, more render intensive.
• Gaussian Higher: An even higher quality of blur. Increases render times.
• Gaussian Highest: The highest quality blur. The most render intensive.
• Pyramid: The fastest option and is generally adequate for most uses.
• Pyramid Smoother: A fast and smooth blur option.

Region Parameter Group

The Region parameters allow you to define a specific region of interest in which the filter is applied, leaving the rest of the image unchanged.

• Region of Interest Top-Left:Sets the upper left corners of a rectangle within which the filter is applied.
• Region of Interest Bot-Right: Sets the bottom right corners of a rectangle within which the filter is applied.
• Region Blend: Softens the edges of the region.
• View Matte: Displays the matte.