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Perancangan Multimedia untuk World Wide Web Pertemuan 12

Perancangan Multimedia untuk World Wide Web Pertemuan 12. Matakuliah : T0732 / Sistem Multimedia Tahun : 2007. Learning Outcomes. Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : menyesuaikan desain aplikasi multimedia untuk penggunaan di World Wide Web . Outline Materi.

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Perancangan Multimedia untuk World Wide Web Pertemuan 12

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  1. Perancangan Multimedia untuk World Wide Web Pertemuan 12 Matakuliah : T0732 / Sistem Multimedia Tahun : 2007

  2. Learning Outcomes Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : • menyesuaikan desain aplikasi multimedia untuk penggunaan di World Wide Web

  3. Outline Materi • Teknologi WWW • Authoring Tools untuk WWW • Desain untuk WWW • Konsiderasi untuk Elemen-Elemen Multimedia

  4. WWW Technology • HTML (HyperText Markup Language) • DHTML (Dynamic HTML) • XML (eXtensible Markup Language) • SMIL (Synchronized Multimedia Integration Language) • VRML (Virtual Reality Markup Language) • Browser supports • Plug-in media handlers: allows movies, multimedia files to be viewed via native browser, ex : shockwave plugin, Quicktime VR, real audio, acrobat reader • JAVA Script: allows transfer of applets, small programs via HTTP and execute in browser.

  5. Web Pages • Web pages are made up of basic text documents • Can be created in any text editor such as Notepad • Multimedia elements (except text) are stored external to the document • HTML defines the format (look) and functionality (feel) of web pages and provides the links to external resources

  6. HTML Advantages • Small file sizes • Does not require expensive authoring tools • Web space is inexpensive • Does not require programming skills • Provides links to external locations & downloads • Once uploaded, provides “Instant Publication” • Can be viewed on any computer with free web browsing software

  7. HTML Disadvantages • What you design will not necessarily appear the same on every computer! • No single HTML standard • Different browsers support different/unique HTML tags • Different hardware affects final result • Hypertext only provides limited interaction

  8. Authoring Tools for WWW • Macromedia Dreamweaver • Microsoft Frontpage

  9. Design Issues • Different Browsers • Monitor and Window size • Bandwidth • Accessibility • Usability http://www.apis.ca/Understanding_Websites/Good_Sites_Bad_Sites/What_makes_a_good_website.htm

  10. Different Browsers • Not all web browsers support proprietary features, eg different implementations of DHTML • Browser settings affect final product • Fonts selected and installed • Colour of background • Hypertext colours • Autodownloading images • Window size

  11. Browser Statistic http://www.thecounter.com/ http://www.upsdell.com/BrowserNews/stat.htm

  12. Monitor and Window Issues • Many people are surfing the web with various screen resolution and different sized window screens. • Recommendation  use liquid design when designing your web pages. • You may want to design for the commonly used screen resolution. • Personal Digital Assistants (eg Palm, Windows CE, and other WAP devices have small low resolution screens)

  13. Liquid Design • Liquid design  the web site adapts itself to the available space, the same way water takes the shape of the glass it is in.

  14. Bandwith • The rule of thumb for a person using a 28.8k modem is 2 kps to transfer web graphics. • Example : a standard 40k graphic might take 20 seconds to display on your users browser.

  15. Accessibility Issues • Visual Impaired Users • Cannot access images that are used to convey content or to assist navigation • Have difficulty distinguishing important screen elements or text where background images are used. • Solution • Provide ALT text for short descriptions of graphics, use & Longdesc attributes or links out for longer pieces • Lots of motion, flashing etc can be disconcerting so avoid client-based refresh & redirection, lots of animated gifs etc • Avoid using frames or unnecessary tables • How accessible is your site? http://www.w3.org/WAI/ER/existingtools.htm

  16. Accessibility – ALT text

  17. The Ten Most Violated Homepage Design Guidelinesby Jacob Nielsen • Emphasize what your site offers that's of value to users and how your services differ from those of key competitors • Use a liquid layout that lets users adjust the homepage size • Use color to distinguish visited and unvisited links • Use graphics to show real content, not just to decorate your homepage • Include a tag line that explicitly summarizes what the site or company does • Make it easy to access anything recently featured on your homepage • Include a short site description in the window title • Don't use a heading to label the search area; instead use a "Search" button to the right of the box • With stock quotes, give the percentage of change, not just the points gained or lost • Don't include an active link to the homepage on the homepage

  18. Text for Web • Users may choose to view the website in their preferred font (done by setting user preference in the browser) • Standard font face : Times New Roman, Courier, etc • For flexibility in font management : CCS (Cascading Style Sheets) • CCS is available in DHTML

  19. Images for Web • Standard format : GIF, PNG, JPEG • Other format may require special plug-ins. • GIF and PNG are lossless and support transparency • PNG  GIF replacement • JPEG  lossy compression, ten times more compressed than GIF • Macromedia Fireworks is designed specifically for creating graphics for web pages.

  20. Sound for Web • Standard format : AU, Wav, MIDI  embedded • MIDI is commonly used for background music • Wav is big in size • 11khz, 8 bit mono  reduced quality but still audible • Using plugin : Shockwave Audio (swa), QuickTime

  21. Animation for Web • HTML Tag : <blink> and <marquee> • Javascript • Animated GIF (GIF89) can be used to make simple cell animations • Animation Plug-ins/players : Director, Flash, QuickTimeVR Note : While animation is good for attracting user’s attention, take care not to use blinking animation for reading text.

  22. 3D for Web • VRML • Macromedia Director

  23. Flash or non-Flash? • Flash Advantages • Current Trend • Great Design • Full control and flexibility for designers to design interactions with users • Flash issues • Long download for slow internet connection users • Need additional plug-in • Different version requires different plug-ins • Can’t accommodate large amount of text • Difficult/Impossible for visually impaired users to browse

  24. Video for Web • The largest multimedia element in size • Low bandwidth video requires compression • Choose the most commonly used compression • Streaming Technology • Data ‘streams’ from the server to the player • The player commences playing while data is still streaming • Audio streaming uses a buffer • Video streaming uses a bigger buffer • Example : www.youtube.com

  25. Good and Bad Websites • http://www.coolhomepages.com/ • http://www.webpagesthatsuck.com/

  26. Good or Bad?

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