This is useful if you have some leftover green pixels on the keyed image, if you soften the edges then these pixels will not be as noticeable when you substitute in a new background. The Feathering parameter is used to apply a 'soft edge' or alpha channel blur to the foreground image. when the Threshold slider is full, the Fading Slider will have No effect). This is useful when you need to apply a green screen effect to a video with a bright white or dark black background.Īs the Threshold value increases, the Fading slider will have less and less of an effect (i.e. However, for best results it may be necessary to manually choose one of the other options. Selecting Auto in the Based on: dropdown will attempt to automatically switch between Color and Color + Brightness based on the chosen color. Selecting Color + Brightness in the Based on: dropdown will remove color in the video based on how closely it matches the color and brightness of the chosen color. Selecting Color in the Based on: dropdown will remove color in the video based on how closely it matches the chosen color. Change the Threshold and Fading values to adjust how similar a color has to be to the selected color for it to be removed. Alternatively, you can use the color picker control on the left side of the dialog to choose a color more precisely. You can do this when the cursor hovering over it changes to an eyedropper icon. To configure the effect, with the Video Effects dialog open, click on the clip preview to choose the color to remove. The background can then be removed with the green screen video effect to reveal another clip underneath which will provide the new background.įollow the instructions in Video Effects to add a Green Screen video effect. For example, to show an actor standing in front of a computer generated background, the footage of the actor can be shot against a green screen. How To - Blue or Green Screen Chroma Keying Also known as 'blue screen' or 'chroma keying', green screen is the process of removing a selected color from an image.

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