These tools allow users to add backgrounds, textures, and other elements to their projects. If you’ve never keyed a shot before, or if you are having trouble doing so in iMovie, give it a shot in Final Cut Pro.Final Cut Pro is a popular iOS video editing application that offers editors and filmmakers various features, including generators. The Keyer effect in Final Cut Pro X often produces great results automatically, and its powerful manual controls let you refine your key so that even a poorly lit shot will key nicely. If you increase the Spill Level too much, you introduce a magenta cast to the entire foreground subject.ĭrag the slider to find the optimal level, where you eliminate the green spill without introducing a color cast. If you set the Spill Level to zero, you can clearly see the green spill. The Spill Level parameter attempts to fix this automatically by adding the complementary color (in this case, magenta) to neutralize the spill. The light on the green screen can reflect back onto the subject, spilling green light around the edges. The final step is to clean up any green areas that may still appear around the edges of your subject. Adjusting the Edges tool to create a solid white subject, a black background, and good hair detail. Fixing ‘spill’ The initial key with the Edges tool in Matte view-notice the gray areas that indicate partial transparency. I prefer to use this tool while in Matte view. Adjust the end points and the slider in between to keep as much detail as possible while removing as much background color as you can. Back in the Inspector, select the Edges tool then, in the Viewer, drag a line that crosses from the background to your subject. With the background color removed, the second step is to improve the key along the edges of your subject. Select the Sample Color tool… …and drag out a rectangle to key out the background color. Tip: If you are having trouble at the edges of the frame, use the Mask effect to mask out them out. If necessary, you can add more boxes to remove more of the background. As soon as you draw the box, all the colors inside that box are removed. Start by clicking the Sample Color icon then, in the Viewer, drag out a rectangle over the green background. If the background is unevenly lit, choose an area close to the subject, ideally close to difficult areas to key, such as hair. You accomplish this with the two tools in the Refine Key section of the Inspector: Sample Color and Edges. The next step is to tell Final Cut Pro what color values to remove. Setting the Strength parameter to zero removes all automatic keying. To key manually, the first step is to set the Strength slider to 0. The Strength parameter in the Keyer effect determines how much automatic keying Final Cut Pro uses. If the interior of your subject isn’t solid white, if the background isn’t jet black, or if the edges of your subject don’t look smooth, you can try a manual key. So, the matte for a good key should have a completely black background and a completely white foreground, and it should be gray in semitransparent areas. The Matte view uses shades of gray to indicate what parts of the shot are being removed: The darker the shade of gray, the more that area is cut out of the shot. The Matte view creates a grayscale representation of your key. Even better, click the middle View button in the Inspector-the one with the white head on the black background-to see the matte that the key created. Use the Fit pop-up menu at the top right to zoom in closer and inspect the edge detail. To evaluate the automatic key, check the composite image in the Viewer.
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