You do this by using the Magnification Ratio Popup, in the Main Composition Window. Your selections will be more precise if you make the artwork nice and big. By expanding Effects and further, you will also find the controls.īefore you remove a colour background, you should magnify the composition and artwork you intend to key out. When you expand the layer, you should find, in addition to the default Transform features, the Effects. On the movie layer, click on the Expand/Collapse button, the “triangle-shape” to the left of the Layer Name. You can also adjust the effects from the Timeline. A series of Minimum and Maximum values - on sliders.Minus Colour Picker or "Minus Eye Dropper".Plus Colour Picker or "Plus Eye Dropper".There, you will also find the following items: To set colour key options, you should call up the Effects Controls (Main Menu > Window > Effects Controls). In the Timeline, click on the layer to activate it, and then go to the Main Menu > Effect > Keying, and choose Colour Range. It should sit above a background layer, such as a image file, colour solid, other movie, etc. You should import the movie or image sequence into After Effects, which should include a colour that you intend to “key out.” Make a composition and drop the movie into the composition, as a layer. ![]() It all depends on how well you light or illuminate the colour field. On one hand, the colour key process can be remarkably simple and straightforward, or it can be fussy and complicated. The process works well for stills and image sequences, as well as movie files. You can then composite the animation against artwork of some kind. For example, if you have animation that occurs against a colour background (such as green), you can select the region and, as a result, all of the colour pixels in the background and movie will become transparent. This process is called "colour keying." It's a handy feature. It's possible to use After Effects to select a colour region in a movie file and "turn the colour off," thus making the colour field transparent.
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