Using a hold-out matteA hold-out matte (also known as a hold-back matte) is a duplicate of the layer you have keyed. The hold-out matte, however, is masked to include only the area of the image containing the key color that you want to preserve as opaque. The hold-out matte is then placed directly on top of the keyed layer; when rendered, the hold-out matte prevents the area from becoming transparent. Typically, you would create a hold-out matte for only one or two frames, when the subject is in a particular position that makes the color visible. Hold-out mattes are not recommended for preserving color for longer periods of time because the effect may become more obviously visible. ![]() A. Original bluescreen image. The number's background is also blue. B. After keying, the number's background is also transparent. C. Hold-out matte containing the part of the image you want to remain opaque D. When the hold-out matte is placed on top of the keyed image, the number's background is now opaque. To create a hold-out matte:
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