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Multimedia in Web

Multimedia in Web. Introduction. Multimedia Elements in Web Page. Images Voice Music Animation Video Text & Numbers. Digitalization. Contents  Numbers (0’s & 1’s) For computers and the Internet

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Multimedia in Web

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  1. Multimedia in Web Introduction

  2. Multimedia Elements in Web Page • Images • Voice • Music • Animation • Video • Text & Numbers

  3. Digitalization • Contents  Numbers (0’s & 1’s) • For computers and the Internet • Different media originated and developed differently, e.g. sound & image  Different formats • Accessibility: http://www.w3c.org/WAI/

  4. Pixels • Picture element • Values in color and brightness

  5. Role of Bandwidth • Volume of data can transmit in one second • 56K (Dial-up) • ISDN 128 Kbits/sec • DSL and Cable (Broadband) 512 Kbits/sec • T1 1.5 Mbits/sec • Ethernet 10-100 Mbits/sec

  6. Data Compression • Digitalization  Compression  Decompression • Codecs = Compression + Decompression • Removing repetition: e.g. 405 405 405 405 405 405 X 5

  7. Averaging: e.g. 378 379 378 376 378 X 4 • Range Reduction: e.g. 8 bit (256)  6 bit (64) Sound loudness can be expressed in 256 levels or 64 levels.

  8. File Formats • Images • GIF • JPEG • PNG • Sound • AIF (Audio Interchange File) • QuickTime

  9. Video • QuickTime (mov) • Window Media • RealVideo • Animation • Flash

  10. Viewer Capacity Consideration • Bandwidth • Speed test at http://sea.speakeasy.net/ • Screen size & resolution • 640 X 480 pixel screen • Processor • Video System, Ram, & BUS • Firewall • Plug-Ins: e.g. Flash Player • Browser

  11. Experience • Find types of images used • Go to http://www.moma.org/ • Right-click on images  Properties • Movies: • http://www.atomfilms.com/ • http://www.ifilm.com/

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