• Multimedia is media and content that uses a
combination of different content forms.
• Multimedia includes a combination of text, audio,
still images, animation, video, and interactivity
Multimedia finds its application in various areas
including, but not limited to,
• From the beginning of history, humans have used
graphics and text to communicate experiences,
knowledge and feelings.
• With multimedia technology, text can be combined
with other media in a powerful and meaningful way
to present information and express moods.
Fonts and faces
• A font is a collection of characters of a single size and
style belonging to a particular typeface family.
• Typical font styles are boldface and italic.
• Other style attributes, such as underlining, outlining,
and strikeout of characters.
Fonts and faces Contd.
• Type sizes are usually expressed in points.
One point is 0.0138 inches or about 1/72
of an inch.
• Arial, Courier, and Times New Roman
are typefaces, Arial12-point italic is a
• Fonts can be characterized as serif, sans serif, and
• A serif is a line or curve extending from the ends of a
stroke of a character.
• The French word sans means without, so sans serif
typeface is one without serifs.
• Audio is one of the most appealing elements of any
exciting and successful multimedia presentation.
• Audio establishes the aural dimension, setting the
mood, establishing the ambiance of your presentation.
• In order for a computer to work with audio waves,
they must be converted from analog to digital form.
• This is done through a process called sampling, in
which every fraction of a second a sample of the
audio is recorded in digital bits.
• There are two factors that affect the quality of the
1. Sample Rate
2. Sample Size
Storing Sound Data
There are two means of storing sound data that are
roughly analogous to vector and bitmap graphics.
1. Waveform Audio (or digital audio)
2. Musical Instrument Digital Interface (MIDI)
• Many visual representations are generally much more
effective at conveying information than text.
• Most graphics also can convey messages instantly
and they may also serve as hyperlinks.
• Graphics such as drawings and photographs are
integral to multimedia titles.
There are two categories of graphics. They are
Vector & Bitmap Graphics
• Vector graphics, also called draw-type graphics,
represent an image as a geometric shape made up of
straight lines, ovals, curves, and arcs.
• Bitmap graphics are also called raster graphics. A
bitmap represents the image as an array of dots,
Types of Graphics
• Animation is a type of optical illusion.
• The creation of artificial moving images.
• Animation plays a huge role in entertainment
(providing action and realism) and education
(providing visualization and demonstration).
Types of Animation
There are two main types of animations which are
used in multimedia applications.
1. 2D animation or linear animation
2. 3D animation
Virtual Reality (VR)
• Virtual reality is an artificial environment that is
created with software. It can be experienced through
two of the five senses: sight and sound.
• It can be used for simulation of a real environment for
training and education. The development of an
imagined environment for games.
• Video makes use of all of the elements of multimedia,
bringing your products and services alive, but at a
• The embedding of video in multimedia applications is
a powerful way to convey information which can
incorporate a personal element which other media
Digitizing the Video Signal
There are two basic approaches to delivering video on
a computer screen – analogue and digital video.
The process for digitizing an analog video signal.
Video compression/decompression programs, known
as codecs, have been developed to reduce the size of
There are two types of compression
• Interactivity allows the viewer to navigate through a
presentation in their own way and at their own pace.
• Users can jump from topic to topic and skipping areas
of little interest.
Electronic Slide Show
• Giving an electronic slide show presentation is
similar to using overhead transparencies or traditional
• Program such as Microsoft Power Point, Adobe
Persuasion, Asymetrix Compel uses a slide show