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					Displaying in Multimedia
    In this unit you will:
Identifythe hardware used to
 display multimedia.
Investigate the software used to
 create multimedia
                 Screens
     Cathode-ray tube (CRT) display
 The CRT produce images by firing a electron
  beam onto a phosphorescent surface.
 It uses a raster scan to produce an image on a
  screen.
 To maintain an image on a screen it uses a process
  called refreshing- a repeated raster scan.
           The CRT screen




A:Cathode               D: Phosphor coated screen
B: Conductive coating   E: Electron beam
C: Anode                F: Shadow mask
Raster scan
       Beams fade so they must
        be reactivated.
       It is done by repeated scans
        of each line.
       This resembles a series of
        zig-zag lines on the screen.
       A complete sweep is called
        a field.
       The screen is redrawn at
        60-72 time/sec. This is
        known as the refresh rate.
 The Vector display system
 A special type of CRT- only displays
  vector graphics.
 Directs the electron stream to draw only
  lines.
 Shading drawn as a series of lines.
 Have faster refresh rate than CRT using
  raster scan.
        Liquid crystal displays

 LCD’s uses a piece of
  liquid crystal material
  placed between a pair of
  transparent electrodes.
 LCD’s offer
  considerable savings in
  size, weight and power.
         LCD’s and CRT’s
 LCD’s are very light take up less room,
  produces no heat, have no glare and
  produces no radiation.
 LCD’s uses less power than CRT’s.
 Can be powered by batteries.
 LCD does not produce the same picture
  quality as CRT.
 LCD’s are used in portable computers.
 Can be mounted on the wall.
          The Plasma screen
 Plasma display
  illuminates tiny coloured
  fluorescent lights to form
  an image.
 Each pixel is made up of
  three fluorescent lights - a
  red, a green and a blue
  light.
 The plasma display varies
  the intensities of the
  different lights to produce
  a full range of colours.
           Touch screens
 Touch screens enter data
  by detecting the touch of
  the user’s finger.
 The user’s finger
  interrupts a matrix of
  infrared light beams.
 Touch screens do not
  allow fine precision of
  input.
 Uses big buttons or areas
  on screen
           Projection devices
 A data projection panel
  is used with a
  overhead projector to
  project an image onto a
  wall or white screen.
 Data projectors takes a
  signal directly from a
  computer and project it
  onto a wall or screen.
Speakers and sound systems
 Speakers produce analog
  sound from audio
  digitised signals from the
  computer.
 You need software driver,
  sound card and a digital
  audio circuit board
  (Sound Blaster).
 Sound cards in PC’s can
  also play and create MIDI
  and waveform files.
          Head-up displays
 Head-up displays are worn
  on the head to give the
  wearer a 3D image in an
  artificial world.
 It will further blur the line
  between what's real and
  what's computer-generated
  by enhancing what we see,
  hear, feel and smell.
          Software
 Presentation software
 Application software
 Authoring software
 Animation software
 Web browsers
 HTML editors
         Presentation software
 Used to make a professional presentation to a
  group of people.
 Improves communication.
 Consists of slides.(text, graphics, animation, audio
  and video)
 Microsoft PowerPoint and AppleWorks.
 Include a range of options or documents:
   –   On-screen presentations
   –   Audience handouts
   –   Overhead transparencies
   –   Speaker’s notes
       Application software
 Application software is used for a specific
                    task.
 Word processors
 Spreadsheets
 Graphics software
 Audio software
 Video software
 Project management software
          Authoring software
      Authoring software is used to combine the
    separate media types into a multimedia product.
 The user can sequence and time the
  occurrence of events.
 Allows for interactivity.
 Examples of authoring software:
    – Macromedia Director
    – HyperCard
    – HyperStudio
          Animation software
 Takes individual images
  and creates the illusion
  of movement.
 Types of animation
  software:
    – 2D two-dimensional
    – 3D three dimensional
    – Warping and Morphing
                 Web browsers
    A web browser is a software program that allows
                      access to the Web.
   Multimedia files are embedded.
   Multimedia files takes longer to download.
   Web browsers can play audio and video with plug-ins.
   Examples:
    – Netscape Navigator
    – Microsoft Internet Explorer
    – Firefox
    – Safari
                 HTML editors
    HTML editors are programs to assist in
            creating Web pages.
            (Hypertext markup language)
 Use tags that indicate how parts of a document will be
  displayed. <HTML> and </HTML>
 HTML editor is a program that specialises in writing
  HTML code.
 Tags are metadata, or information about data.
 JavaScript allows for more multimedia elements to be
  embedded in a web page.
   The End

Displaying
in Multimedia Systems

				
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posted:3/30/2012
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