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Frames and fields


    Each frame in an interlaced video source is made up of fields. It's important not to confuse frames with fields. For video, every frame contains two interlaced fields. If you want to use interlaced video as source footage, you'll usually want After Effects to separate the interlaced fields. Separating fields ensures maximum image quality when you apply animations and effects to video that was originally interlaced. If you're producing a movie for videotape, you can render the composition to fields in a process known as field-rendering. See Interlaced and noninterlaced footage and Field rendering.