Use chroma keys A challenging part of creating a good is shooting the chroma key video and, in particular, using a good, well-lit background that provides a uniform color to remove. A wide variety of specialized chroma key background options are available, from chroma key paint that includes highly reflective additives to chroma key cloth or paper sheets. It’s also important to use the best camera you can and to avoid using a highly compressed video format such as DV or MPEG-2. In the following examples, an image of a woman is keyed over a scene in an empty subway station.

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The light stands are removed in. • In the, select the foreground clip with the Keyer effect, then open the. Controls for modifying and improving the Keyer effect appear. • If the Select tool is not the active tool, choose it from the Tools pop-up menu above the timeline (or press A). • To improve the key using controls in the, use the Refine Key and Strength controls to do any of the following: • Identify areas of the foreground clip that might still have some of the chroma key color showing: Click the Sample Color thumbnail image in the Video inspector and draw a rectangle in the viewer over the area where the chroma key color needs to be removed. Tip: Select Matte (the center button) in the View area in the Video inspector to see the that the chroma keyer is creating.

This can make it much easier to see areas that are not keying well. • Refine any difficult areas, such as hair and reflections: Click the Edges thumbnail image in the Video inspector, draw a line across the difficult area in the viewer (with one end in the area to keep and the other in the area to remove), and drag the line’s handle to adjust the edge softness.

You can use the following keyboard shortcuts to work directly in the viewer: • Make a Sample Color adjustment: Draw a rectangle while holding down the Shift key. • Make an Edges adjustment: Draw a line while holding down the Command key. • Delete a Sample Color or Edges adjustment: Click a Sample Color rectangle or Edges line while holding down the Option key, or select the control and press the Delete key. • Choose a different color if the Keyer effect chose the wrong color: Set the Strength parameter to 0% (to override the automatic initial color sampling). Then use Sample Color to choose the color to remove. Select Composite (the left button) in the View area to see the foreground clip combined with the background clip. • Adjust how strongly the Keyer matches a color in the foreground image to the default chroma key color: Use the Strength slider to adjust the tolerance (core transparency) of the Keyer effect’s automatic sampling.

The default value is 100%. Reducing this value narrows the range of color sampled, resulting in less transparency in the keyed image. Increasing the Strength value expands the range of color sampled, resulting in more transparency in the keyed image. The Strength parameter is useful for retrieving areas of semitransparent detail such as hair, smoke, or reflections. • To help fine-tune the key, use the View options: • Composite: Shows the final composited image, with the keyed foreground subject over the background clip. This is the default view. • Matte: Shows the grayscale matte, or alpha channel, that’s being generated by the keying operation.