Chroma Controls
Settings in this section are used to apply blur and translation operations on the color channels of the foreground material, in order to offset artifacts due to color subsampling.
Horizontal and Vertical Blur: Apply a horizontal and/or vertical blur to the color channels of the foreground in order to soften the blockiness that can occur during compression.
Horizontal and Vertical Shift: Apply a horizontal and/or vertical translation to the color channels in order to offset slight pixel shifting that can occur during compression.
Scale: Scales the overall background matte.
Blend Controls
Settings in this section are used to adjust the blending of the foreground and background images during the final composite.
Background Amount: Adjusts the amount of preserved foreground detail that is brought into the final composite.
Background Highlights: Brightens or suppresses highlights in the blended detail.
Background Saturation: Adjusts the color saturation of the blend details.
Background Brightness: Adjusts the pre-composite brightness of the background image.
Spill Suppression
Channel Mix: This controls the mix between the 2nd and 3rd channels in the Average setting above. By default, the Channel Mix is set to 0.5, which is a 50% average between the two channels. By sliding towards one side or the other, the mix can be set. In practice, 0.5 works the best for most shots. With red, frizzy hair, pushing the average to 0.6 will get rid of green fringes.
Dynamic Spill Suppression: Adjusts the amount of dynamic spill suppression to apply to the foreground. The removal is ‘dynamic’ in the sense that it takes into account the brightness of the background at each pixel in order to determine the appropriate brightness of the unspilled pixels at the edges of the foreground.
Edge Color: dvMatte automatically applies a despill operation, which removes the blue or green light spill that is frequently found on the edges of a foreground subject. The despill operation can leave edges of a grayish color, which needs to be matched to the background to avoid an obvious edge. Click the Pick Edge Color to select an edge color that matches the background.