Its a big web

1
Lecture 10

• Its a big web
• Chapters 10 and 11

2
Multimedia

• refers to any type of application or
  presentation that involves more than one type of
  media, such as text, graphics, video, animation,
  and sound

3
Multimedia

• Websites are great examples of multimedia

4
Webpages

• Normally html based
• Hyper Text Markup Language
• Series of commands and codes that your web
  browser translates into a webpage
• Other types
• xml
• dhtml
• wml

5
Source Code
6
Webpages

• Use a home page
• Often named index.html
• Most websites have a single folder for Images
• All pictures are saved in this file

7
Webpages

• An html file is not like a Word Document or a
  Power Point presentation
• You do not insert a picture into an html file
• You give an address where the picture can be
  found
• Example ../images/logo.gif

8
Images

• Graphic Interchange File (GIF)
• Highly compressed
• Limited colors (256)
• Lossless file compression
• does not permanently loose quality

9
Images

• Joint Photographic Experts Group (JPEG)
• 16 million colors (true color)
• Great for photographs
• Size depends on compression
• Discards information permanently when compressed
• Lossy file compression

10
Images

• Portable Network Graphic (PNG)
• Created for web pages
• Capable of true color
• Compression is more efficient then GIF
• Lossless compression

11
Images

• Which do you use?
• Pictures and photographs are best in jpg
• Buttons, art, graphics are best in png
• gif have been used for a long time, but will soon
  be replaced by png
• No regulations on the web, can still use whatever
  format you want

12
Animation

• gifs can be grouped together into one gif file
  and displayed one after another
• Example
• Java Script and Flash are also popular animation
  types used on the web

13
Other Web Media

• Video
• avi
• mpeg
• mov
• rm

• Sound
• wav
• mp3
• aiff

14
E-Commerce

• the process of performing financial transactions
  online
• Inevitable!!
• Soon many banks will not send the physical check
  to your bank to be cashed.
• The money will be digitally wired
• No more floating checks

15
E-commerce

• There are very few things we cannot buy online
• Ebay
• Dot-coms and etailers vs. brick and mortar
  stores

16
E-commerce

• Advantages
• Lower cost
• No geographic limitations
• More selection
• Easy comparison
• Easier to manage

• Risks
• FRAUD
• Shipping
• Web/power outage
• Lost business

17
Customer Data

• Data Warehouse comprehensive collection of
  data about a company and its customers
• Data Mining makes use of a data warehouse by
  applying intelligent software to scan its
  contents for subtle patterns that may not be
  evident to management

18
Customer Data

• Companies keep track of buying patterns, and
  tendencies.
• Will cater content of website to viewers
  preferences, geography, and any other information
  they obtain about the individual
• Not always a bad thing

19
E - commerce

• When conducting transactions online, look for the
  padlock icon at the bottom of the window.
• This indicates a secured connection

20
E - commerce

• Some credit cards are very e commerce friendly.
• Provide a one time use number for online
  transactions
• Also, companies like paypal are typically very
  secure and ideal for small companies and
  individuals.