Apple Final Cut Pro 5 - Manual (Page 1764)

Glossary 413
Betacam SP A high-end, standard definition component analog video format.
Supports four tracks of analog audio.
Betacam SX A standard definition, 8-bit digital videotape recorder format with
10:1 video compression using MPEG-2 compression, and 4:2:2 color sampling. Supports
four tracks of audio with 16-bit, 48 kHz audio sampling.
Bezier curve In its simplest form, a line defined by two end points and two associated
control points, or “handles”. Pulling the control points adjust the line into a curve.
Named after Pierre Bezier, who discovered the mathematical formula for these curves.
In Final Cut Pro, Bezier curves are used to adjust keyframed effects and to create curves
in motion paths.
Bezier handles Controls that let you modify the curve of a line segment between a
handle and the next point on either side of it. The farther a handle is dragged from its
vertex point, the more it bends or curves the line segment. Used for smoothing
keyframes.
bin A container (or folder) inside of the Browser that can contain clips, sequences,
transitions, effects, and generators. You use bins to organize these elements, sort them,
add comments, rename items, and so on.
black level An analog video signal’s voltage level for the color black, represented by
IRE units. Absolute black, or setup, is represented by 7.5 IRE for NTSC in the United
States and 0 IRE for NTSC in Japan and for PAL.
blue or green screening A special effects technique that allows you to derive an alpha
channel or matte from the blue or green background of a video clip in order to make it
transparent for purposes of compositing against other clips. Blue-screen technology is
what makes weather forecasters appear to be standing against an animated map,
when in reality they’re standing in front of a blue wall. Also known as chroma keying.
See also keying.
boosting The act of raising an audio level.
boundary Refers to either the In or Out point of a clip in the Timeline.
broadcast Refers to signals intended for delivery on television, as well as network
delivery to a wide audience. Broadcasters may have strict guidelines for the signal
quality of programs for air. Broadcast quality is a phrase often used when referring to
these guidelines.
broadcast legal Broadcast facilities have limits on the maximum values of luma and
chroma that are allowable for broadcast. If a video exceeds these limits, distortion can
appear, resulting in unacceptable transmission quality. You can use the Final Cut Pro
video scopes and range-checking options to make sure that the luma and chroma
levels you set stay legal.