Terms that appear in the Label column of the Browser such as "Best Take" and "Interview." Labels can also be assigned to clips and media to help distinguish and sort them. Each label has an associated color that is also applied to clips.
Letterbox
When widescreen video is displayed to fit within a standard 4 x 3 monitor, putting black at the top and bottom of the picture.
Lift edit
An edit function that leaves a gap when material is lifted from the Timeline.
Link
(1) To connect an audio clip and video clip together in the Timeline so that when one item is selected, moved, or trimmed, all other items linked to it are affected. (2) The connection between a clip and its associated source media file on disk. If you move source media files, change their names, or put them in the Trash, the links break and associated clips in your Final Cut Pro project become offline clips.
Linked selection
An option in the Timeline that, when enabled, maintains connections between linked clips. When linked selection is turned off, linked items behave as if they are not connected.
Lock Track control
The lock icon in the Timeline tracks control area, which locks and unlocks tracks.
See also [Locked track]
Locked track
A track whose contents cannot be moved or changed. Cross-hatched lines distinguish a locked track on the Timeline. You can lock or unlock tracks at any time by clicking the Lock Track control on the Timeline.
Log and Capture
The process of playing clips from a device and logging and capturing the clips you want to use in editing.
Log bin
A specific bin where all the logged or captured clips go when using the Log and Capture window.
logging
The process of entering detailed information including the In and Out points from your source material, log notes, and so on, in preparation to be captured.
Looping
A playback mode of repeatedly playing the same portion of a clip or sequence from an In point to an Out point.
Lower third
Lines of text used to identify a person, place, or thing in a clip.
Luma
Short for luminance. A value describing the brightness part of the video signal without color (chroma).
Luma Key
A filter used to key out a luminance value, creating a matte based on the brightest or darkest area of an image.