BCC+ Linear Color Key

Category: BCC Key and Blend

Effect Name: BCC Linear Color Key

The BCC+ Linear Color Key, part of the BCC Key and Blend category, creates an alpha channel key based on the difference between the color of each pixel and the specified Key Color and can be defined and controlled in RGB, HSL, LCH, Chroma or Hue color space. The resulting key can be further tuned with user controls over color weights, blur, gamma and chokes. This filter also includes a full Pixel Chooser with Mocha option for object isolation and garbage masking. The Linear Color Key also allows you to remove unwanted foreground objects or restore opacity to a transparent region in the foreground using the Region of Interest controls.

Working with the Filter

FX Editor and Presets

• Use the FX Editor to load or save presets for reuse.
• To load a preset: Open the FX Editor, select a preset from the Presets panel, and click Apply to return to the host application.
• To save a custom preset: While in the FX Editor, click the Create Custom Preset icon in the parameter list, enter a preset name, and click Done. Additionally, a custom preset can be saved from the main menu bar by selecting File->Save Preset.
• To import custom presets from another drive: While in the FX Editor, select File->Import Preset from the main menu bar.

Effect Controls

Mocha Mask and Track

Continuum effects include integrated masking and matte tools that allow you to restrict the effect to specific regions of the image.

• Mocha masks: used to create custom spline masks. Mocha also includes Matte Assist ML and Matte Refine ML, which use machine learning to generate and track masks.
• Pixel Chooser: used to generate geometric shapes, gradients, or mattes based on channel, luma, or color-based selections. Additionally, an AI depth map generator, and an AI-powered face detection model allow for precise control of masks and mattes.

For more information, see Mocha and Pixel Chooser.

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.

• View: Toggles the render view
• Output: Displays the final filtered output
• Matte: Displays the matte used for the key.
• Overlay: Displays a color overlay within the mask region.
• Color Matching: Sets the color model for the keyer
• RGB: Uses red, green, blur color space for the key generation
• HSL: Uses hue-saturation-luma color space for the key generation
• Chroma: Uses only chroma values from the source for the key generation
• Hue: Uses only hue values from the source for the key generation
• LCH: Uses luma-chroma-hue color space for the key generation
• Output: Determines the filters render output
• Key: Renders the keyed image result
• Key Invert: Inverts the key and renders the keyed image result
• Matte: Renders only the generated matte result
• Matte Invert: Inverts the matte and renders the generated matte result
• Gel: Renders the gel result
• Gel Invert: Inverts the matte and renders the gel result
• Keep Color: Useful only when the image already has an alpha channel. It is used to restore opacity to regions that have been made transparent
• Gel Color: Used to select the gel color
• Key Color: Used to set the base key color
• Similarity: Used to expand the key color selection
• RGB Weight Red: Expands the current RGB key color selection into the red color space
• RGB Weight Green: Expands the current RGB key color selection into the green color space
• RGB Weight Blue: Expands the current RGB key color selection into the blue color space
• HSL Hue Tolerance: Expands the current HSL key color selection into other hue values
• HSL Saturation Tolerance: Expands the current HSL key color selection into other saturation values
• HSL Light Tolerance: Expands the current HSL key color selection into other lightness values
• LCH Hue Tolerance: Expands the current LCH key color selection into other hue values
• LCH Saturation Tolerance: Expands the current LCH key color selection into other saturation values
• LCH Light Tolerance: Expands the current LCH key color selection into other lightness values
• Softness: Used to soften the generated key matte within the key color
• Post Blur: Used to add a blur to the current key matte
• Gamma: Gamma correction for the generated key matte
• Alpha Offset: Used to offset the alpha matte values. Negative values will add transparency to the matte, positive values return opacity to the matte
• Choke: Used to shrink/expand the alpha matte

Region Group

• Region of Interest: Determines the shape of the region in which the filter is applied.
• Inside Rectangle: Confines the filter result to the region inside the rectangle shape bounds
• Outside Rectangle: Confines the filter result to the region outside the rectangle shape bounds
• Inside Oval: Confines the filter result to the region inside the oval shape bounds
• Outside Oval: Confines the filter result to the region inside the oval shape bounds
• All: ROI is bypassed and the entire image source is included in the key matte generation
• Top-Left x/y: Sets the top-left position of the region along the x/y axis.
• Bot-Right xy: Sets the bottom-right position of the region along the x/y axis.
• Outside Region: Used to control the processing of points outside the region.
• Crop: Preexisting alpha channel values are cropped to within the ROI
• Use Existing Alpha: Existing alpha channel values outside of the ROI are preserved

• Default: Uses product-wide default of 16 bit half-float GPU rendering.
• 16 Bit Float: Manually force 16 bit half-float GPU rendering.
• 32 Bit Float: Manually force 32 bit full-float GPU rendering.
• Disabled: Forces CPU rendering.