background image -

      The part of a display image, such as a form overlay, that is not changed during a particular sequence of transactions. Contrast with foreground image.
    background music -
      In videotaping, music that accompanies dialog or action.
    balance -
      For audio, refers to the relative strength of the left and right channels. A balance level of 0 is left channel only. A balance level of 100 is right channel only.
    basic input/output system (BIOS) -
      In an IBM personal computer, microcode that controls basic hardware operations, such as interactions with diskette drives, hard disk drives, and the keyboard. (For example, the IBM Enhanced Graphics Adapter has an addressable BIOS, located on the adapter itself, that is used to control the IBM InfoWindow* graphics functions.)
    beta format -
      A consumer and industrial 0.5-inch tape format.
    BG -
      Script abbreviation for background.
    BIOS -
      Basic input/output system.
    bitmap -
      A coded representation in which each bit, or group of bits, represents or corresponds to an item, for example, a configuration of bits in main storage in which each bit indicates whether a peripheral device or a storage block is available or in which each group of bits corresponds to one pel of a display image.
    bit-block transfer -
      Transfer of a rectangular array of bitmap data.
    bitblt -
      Bit-block transfer. Synonym for blit.
    bitmap graphics -
      A form of graphics whereby all points on the display are directly addressable. See also all points addressable.
    blit -
      Synonym for bitblt.
    blitter -
      Hardware that performs bit-block transfer operations.
    BND -
      (1) An internal I/O procedure, provided by the MMPM/2 system, that supports RIFF compound files (commonly called bundle files). (2) The four-character code (FOURCC) of a bundle file. (3) See also RIFF compound file.
    BND file -
      A RIFF compound file.
    BND IOProc -
      An internal I/O procedure, provided by the MMPM/2 system, that supports the elements in a RIFF compound file. See also CF IOProc.
    boom -
      A long, relatively horizontal supporting brace used for holding a microphone or camera; sometimes used to refer to the machinery that supports the camera and allows it to move while shooting.
    brightness -
      Refers to the level of luminosity of the video signal. A brightness level of 0 produces a maximally white signal. A brightness level of 100 produces a maximally black signal.
    buffer -
      A portion of storage used to hold input or output data temporarily.
    bundle file (BND) -
      (1) A file that contains many individual files, called file elements, bound together. The MMIO file manager provides services to locate, query, and access file elements in a bundle file. (2) A RIFF compound file.
    bus -
      A facility for transferring data between several devices located between two end points, only one device being able to transmit at a given moment.
    buy -
      (1) In videotaping, footage that is judged acceptable for use in the final video. (2) Synonym for keeper.


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