BCC Chroma Key

Category: BCC Key and Blend

Effect Name: BCC Chroma Key

The BCC Chroma Key filter, part of the BCC Key and Blend category, is used for compositing camera footage shot using a blue, green, or red screen as a backdrop over a new background video or a still image from a separate file.

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.

• Output: Determines what the filter outputs to the viewer.
• Composite: Displays the composited effect.
• Show Matte: Displays the matte used in the key.
• Density: Adjusts the matte so that transparent areas more transparent and opaque areas more opaque. Too much Density can degrade the matte.
• Balance: Adjusts the balance between density and lightness. Adjusting balance can enhance semi-transparent foreground objects and shadows.
• Lightness: Increasing Lightness makes the entire matte more transparent. Boosting transparency might be necessary to ensure that the background shows through semi-transparent areas, although too much Lightness can result in print-through–that is, the background image might show through the foreground subject.
• Color: Determiens the color used in the chroma key effect.

Color Weight Group

• Red: Sets the weight of the corresponding color channel in creating the matte.
• Green: Sets the weight of the corresponding color channel in creating the matte.
• Blue: Sets the weight of the corresponding color channel in creating the matte.

Spill Suppression Group

After you are satisfied with the matte, check the for color spill–that is, the presence of the background color in the foreground. If a spill is present you can substantially reduce it by modifying Spill Ratio, Tone Mix, and Tone Range. It is best to adjust the controls in the order described. If necessary, you can use the Crop Top-Left and Crop Matte Bot-Right parameters to create a region outside which all pixels become transparent, which can help remove unwanted objects in the foreground.

• Spill Ratio: Reduces background spill but removing the background color from the forground image.
• Tone Mix: Adds background color into the foreground image.
• Tone Range: Sets the range of the foreground color mix, which can help restore the original color to flesh areas.
• Crop Top-LeftDefines the upper left corners of a rectangle that contains the foreground image.
• Crop Bot-RightDefines the bottom right corners of a rectangle that contains the foreground image.