Multimedia in Web
Introduction
Multimedia Elements in Web Page
ImagesVoiceMusicAnimationVideoText & Numbers
Digitalization
Contents Numbers (0’s & 1’s)For computers and the InternetDifferent media originated and
developed differently, e.g. sound & image Different formats
Accessibility: http://www.w3c.org/WAI/
Pixels
Picture element Values in color and brightness
Role of Bandwidth
Volume of data can transmit in one second
56K (Dial-up)ISDN 128 Kbits/secDSL and Cable (Broadband)
512 Kbits/secT1 1.5 Mbits/secEthernet 10-100 Mbits/sec
Data Compression
Digitalization Compression Decompression
Codecs = Compression + DecompressionRemoving repetition:
e.g. 405 405 405 405 405 405 X 5
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.
File Formats
ImagesGIFJPEGPNG
SoundAIF (Audio Interchange File)QuickTime
VideoQuickTime (mov)Window MediaRealVideo
AnimationFlash
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
Experience
Find types of images usedGo to http://www.moma.org/Right-click on images Properties
Movies: http://www.atomfilms.com/ http://www.ifilm.com/