Using these controls, you can simulate the interaction of environmental lighting with the keyed subject, making it appear as if background light wraps around the edges of a subject.Ĭlick Matte Tools to reveal the following controls:įill Holes: Increasing this parameter value adds solidity to regions of marginal transparency within a key.
Light Wrap: These controls blend color and lightness values from the background layer of your composite with the keyed foreground layer. Instead, they alter the matte generated by the Keyer effect’s basic and advanced controls, letting you shrink, expand, soften, or invert the matte to achieve a better composite. These parameters don’t alter the range of values sampled to create the keyed matte. Matte Tools: These controls refine the transparency matte generated by the previous sets of parameters. The following controls are available for use in difficult keying situations or for fine-tuning specific problems: If you’re still having trouble getting a clean luma key, see the following instructions. To mix the keyed effect with the unkeyed effect, adjust the Mix control. To leave smoothly aliased text or graphics in the image visually intact, which can improve the edges, select Preserve RGB. Original: Shows the original, unkeyed image. Viewing the alpha channel makes it easier to spot unwanted holes in the key or areas that aren’t transparent enough. White areas are solid, black areas are transparent, and shades of gray indicate varying levels of transparency. Matte: Shows the grayscale matte, or alpha channel, that’s being generated by the keying operation. To help fine-tune the key, use the View options:Ĭomposite: Shows the final composited image, with the keyed foreground subject over the background clip. Higher values make the edges harder, removing any partial transparency lower values take advantage of any anti-aliasing or softness the edges might have. To adjust the softness of the edges, adjust the Luma Rolloff control. Dragging the white and black controls changes the values that result in fully opaque or fully transparent foreground video. To adjust the white and black clip values, drag the handles at either end of the gradient thumbnail image.īy default, these handles are set to provide a key where the luma level linearly controls the transparency of the foreground-100% white is fully opaque, 0% black is completely transparent, and 25% gray retains 25% of the foreground image. To reverse the key and remove white instead of black areas of the foreground clip, select Invert.
The Effects section of the Video inspector shows the parameters available for adjusting the Luma Keyer effect. In the timeline, select the clip with the Luma Keyer effect.
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