dvMatte Overview
Previzion’s built-in keyer uses a real time implementation of dvMatte Pro 3, an extremely fast and powerful visual effects keyer. dvMatte works with a combination of keying technologies, including a special detail extraction system that is capable of extracting single hairs from the background.
Previzion defaults to the Composite view of dvMatte, which shows the final composite when live video is enabled, and the virtual background when it is disabled. Other available views are:
- Foreground: shows the unchanged incoming live action footage.
- Matte: shows the current matte.
- Blend: shows the detail extraction image, that will be used to extract fine details.
- Background with Blend: shows the background image with a rough composite of the foreground image, using only the details that will be added during the blend operation.
Most compositing operations will be done in the default Composite view, where the final effects of adjustments can be most clearly seen.
High and Low Color Levels
To select the High Color, click the Pick High Color button. The cursor turns into a crosshair, the view displays the incoming live video, and a real time display of the RGB values of the pixel that is underneath the cursor (normalized to 0-1 values) is shown in the Cursor Color box. Click on the brightest area of the greenscreen, avoiding highlights that are not a part of the overall tone of the screen.
To select the Low Color, click the Pick Low Color button. As above, the cursor turns into a crosshair, and the RGB values are displayed. Select the darkest area of the greenscreen, avoiding overt shadows cast by the foreground subject or other set elements.