Multimedia

MULTIMEDIA

Definition

• 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 content forms.

Text

Interactivity

Graphics Audio

Video Animation

Multimedia

Usage

Virtual realityCorporate Presentations

Dresden

Multimedia Applications

Multimedia finds its application in various areas including, but not limited to,

• advertisements• education• entertainment• engineering• Medicine

Text

• 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

font.

Fonts Categories• Fonts can be characterized as serif, sans serif, and

decorative.• 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

• 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.

Sampling• 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 digitized audio.

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. These are

1. Waveform Audio (or digital audio)

2. Musical Instrument Digital Interface (MIDI)

Graphics

• 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.

Graphics Categories    

There are two categories of graphics. They are

1.Vector

2.Bitmaps.

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, called pixels.

Types of Graphics

Drawings PhotographsDiagrams

Cartoons Graphs

Animation

• 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

2D 3D

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

• Video makes use of all of the elements of multimedia, bringing your products and services alive, but at a high cost.

• The embedding of video in multimedia applications is a powerful way to convey information which can incorporate a personal element which other media lack.

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

Video compression/decompression programs, known as codecs, have been developed to reduce the size of video files.

There are two types of compression

1.Lossless compression

2.Lossy compression

Interactivity

• 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 photographic slides.

• Program such as Microsoft Power Point, Adobe Persuasion, Asymetrix Compel uses a slide show metaphor.