PGDEL/DECP03/02
Uttarakhand Open University
Post Graduate Diploma in e-Learning
E-LEARNING APPLICATION DEVELOPMENT Unit 3.1 Multimedia basics
|
Work in progress, expect frequent changes. Help and feedback is welcome. See discussion page. |
|
3.1.2 Multimedia Componets
Designing With Text When designing with text, there are several key terms with which you should be familiar. First, you should be aware that there are different types of fonts. TrueType fonts are fairly consistent from computer screen to computer screen and from printer to printer. TrueType fonts come with the application software.<br>Print fonts are fonts that are specific to the printer or printers connected to the compute Because the type of printer connected to computers significantly differs, print fonts may not be available from one computer to another. Screen fonts depend on the monitor and may not appear the same from one computer to another.<br>Other terms you should be familiar with are serif and sans serif. Serif for have feet or tails. Sans serif fonts do not have feet Because our eyes have become accustomed to reading serif fonts and using the little feet to track, you should use serif fonts for larger bodies of texts. Sans serif fonts should be used for headings, titles, and callouts because they are more likely to draw attention. Because much of our text in multimedia applications is quite short, sans serif fonts are used quite extensively in multimedia applications.<br>The last two terms have to do with spacing. Kerning is the term used to identify the amount of space between characters. Leading is the amount of space between lines of text. Kerning and leading are dependent upon the font size the use of the text, and both are important in making text readable.
Text Guidelines From a design perspective, when you use text in multimedia applications, keep the following guidelines in mind:
- Convert text to bitmapped graphics to ensure that the fonts you wish to appear in the project will look the same on the user's monitor
*Align headings and bodies of text at the left to make it easier for readers to follow.
*Use text colors that provide a strong contrast against the background.
*Use serif fonts for large bodies of text and sans serif fonts for titles, headings, and callouts.
*Keep blocks of text shorter than 60 characters.
Graphics Because most people are quite visual, graphics, 2D and 3D images, are crucial to multimedia development. In fact, multimedia applications are predominantly graphic. Because they play such a critical role, balancing graphics is essential. When designing a multimedia application, it is important not to get carried away with graphics. Adding just the right graphic and just the right number of graphics may help the user learn and retain more information in less time and with less effort. Adding inappropriate graphics or bombarding the user with too many graphics will most likely be counterproductive.
Graphics that fit most any need are quite easy to find. Commercially prepared drawings called clip art come packaged with many application programs. Clip art is also sold on disk and CD-ROM, or you can download it from the Internet. In addition, you can create your own graphics by using a draw or paint program.
Charts, another type of graphic, can convey a great deal of information in a very limited space. It might take pages of text to describe an idea that can be better illustrated through the use of a single pie chart or bar graph.
Photographs can also be used to enhance multimedia applications. Photographs can be digitized through a color scanner or taken directly with a digital camera. Collections of digital photographs called stock photography are also available on CD-ROM or can be downloaded from the Internet. Sometimes these photographs are free, but many times a fee is charged to use the photo or purchase the rights to the photo.<br>When a graphic or other multimedia object serves as a link to additional information about a topic, the link is called hypermedia.
Animation Animation refers to graphic images that change or move. Animation can convey information, add visual interest, or draw attention to important information or links in a multimedia application. Animation is commonly used in advertising and marketing on the Web because the movement does grab the visitor's attention. By illustrating proper techniques or explaining complex procedures, animation can also serve as an excellent learning aid in computer-based training programs.<br>Like clip art and stock photography, animated graphics are available for purchase on CD-ROM or they can be downloaded from the Internet. In addition, commercial software and shareware can be purchased or downloaded and used to create simple or complex animations.
Sound
By incorporating sound into a multimedia application, you require the user to make use of yet another sense. This enhances the experience and increases the likelihood of user understanding and enjoyment.<br>In multimedia applications, sound that has been digitized is called audio. Audio can be obtained by capturing sound into a personal computer using a microphone, CD-ROM, or other input device. It can also be played from a synthesizer, keyboard, or other musical instrument that is connected to the computer using a MIDI (musical instrument digital interface) port.
Video Video can do a great deal to enhance a presentation, illustrate a proper technique, or advertise a new product. Video files are photographic images played at speeds that make it appear as if the images are in full motion. Video files are incredibly large because a huge number of images are required to give the appearance of motion. Depending on the screen size of the video file, a single second of uncompressed video running at 30 frames per second may require more than 30 MB of storage space. In addition to storage, bandwidth, the amount of data a communication channel can carry, is also an obstacle to the delivery of video. Delivering video over the Internet is particularly challenging.
Despite these challenges, more and more multimedia applications, including multimedia applications disseminated via the Internet, include video. In order to be used effectively, however, video is often compressed, or reduced in size, for storage and transfer, and then decompressed for use. As computer resources continue to improve, the use of video in multimedia applications will also grow.
Interactive multimedia allows users to respond directly to and control media elements. Users of interactive multimedia become active participants in an application instead of passive recipients of information.
Linear media has a beginning and progresses through a set sequence of events until it reaches the end while non-linear media leaves the order of events to the discretion of the user.Multimedia applications are all around us. Our society depends on information and multimedia is an effective and user-friendly way to present it.
Major Characteristics of Multimedia Multimedia presentations may be viewed by person on stage, projected, transmitted, or played locally with a media player. A broadcast may be a live or recorded multimedia presentation. Broadcasts and recordings can be either analog or digital electronic media technology. Digital online multimedia may be downloaded or streamed. Streaming multimedia may be live or on-demand.Multimedia games and simulations may be used in a physical environment with special effects, with multiple users in an online network, or locally with an offline computer, game system, or simulator.
A lasershow is a live multimedia performance.
Enhanced levels of interactivity are made possible by combining multiple forms of media content. Online multimedia is increasingly becoming object-oriented and data-driven, enabling applications with collaborative end-user innovation and personalization on multiple forms of content over time. Examples of these range from multiple forms of content on Web sites like photo galleries with both images (pictures) and title (text) user-updated, to simulations whose co-efficients, events, illustrations, animations or videos are modifiable, allowing the multimedia "experience" to be altered without reprogramming. In addition to seeing and hearing, Haptic technology enables virtual objects to be felt. Emerging technology involving illusions of taste and smell may also enhance the multimedia experience.
&
| 
