Sequencing and combining keys
When creating transparency in footage, you may need to try different keys before you are satisfied with the results. You can also combine two or more keys or matte tools. Because keys are treated as effects, you can easily turn them on or off by clicking the Effect option to the left of the effect name in the Effect Controls window or in the Timeline window. Use the following recommendations for combining keys for specific types of footage items: - To create transparency in well-lit footage shot against a bluescreen or greenscreen, start with the Color Difference Key. Add the Spill Suppressor to remove traces of the key color, and then use one or more of the other matte refinement tools, if necessary. If you are not satisfied with the results, try starting again with the Linear Color Key.
- To create transparency in footage shot against multiple colors, or to create transparency in unevenly lit footage shot against a bluescreen or greenscreen, start with the Color Range key. Add the Spill Suppressor and other tools to refine the matte. If you are not completely satisfied with the results, try starting with or adding the Linear Color Key.
- To create transparency in dark areas or shadows, use the Extract Key on the Luminance channel.
- To make a static background scene transparent, use the Difference Matte Key. Add the Simple Choker and other tools as needed to refine the matte.
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