Transcript PPT - Personal Web Pages

Web-based Application
Development
Lecture 10
February 9, 2006
Anita Raja
The Web Wizard’s Guide to
Web Design
Chapter 4
Gathering and Preparing Text,
Numbers, and Images
Listing the Elements
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After design then what?
Content
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Text
Graphics
Pictures
Sounds
Videos
Logos
Listing the Elements
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Remember your flow chart?
List the elements on each page
Preparing Text
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Sources of text
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Corporations: PR, Comm. Dept.
Brochures, flyers, internal documents, press
releases, annual reports
Printed documents (scan to retrieve text)
Retrieve from existing Web pages
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View source
Copy from screen
Retrieve from person responsible
Preparing Text
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Editing
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Word processing formats are not Web formats
Can’t use same techniques for formatting
Remove:
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Carriage returns
Tabs
Columns
Indents
Justifications
Preparing Text
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Editing (cont.)
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Place content in plain text form
Eliminate unusual formatting or styles
CHECK SPELLING AND GRAMMAR!
Writing for the Web
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Reader’s expectations:
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Fast, convenient, interactive
Web writing tips:
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Keep it short, essentials only
Pyramid structure
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1st paragraph: who, what, where, why, when
If they’re interested they’ll read on
Tell more of the story in subsequent paragraphs
Writing for the Web
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Web writing tips (cont.)
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Use subheadings that describe the content
Use bullets to express separate but parallel ideas
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Omit transitional phrases
Conserves space
Faster reading
Provide links to relevant materials not essential
to your immediate purpose
Writing for the Web
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Gettysburg Address
Written to be … ?
The Web isn’t just a magazine you read on a
screen
Use methods appropriate to your medium
Preparing Numbers
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A couple of standards:
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Spell out numbers up to nine
Use numerals for 10 and above
Use comma separators
When using spreadsheets:
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Keep labels short
Eliminate blank rows and columns
Save as tab-delimited text file
Preparing Numbers
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Tables
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Reference, look-up
Graphs
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Trends over time, comparisons, distributions
Save as images
Preparing Images
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Photography
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Brightly lit subjects photograph better
Indirect lighting
Fill frame with subject
Small groups
Avoid distracting backgrounds
Don’t photograph text
Candid vs. posed
Preparing Images
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Formats (see here also):
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GIF – Graphics Interchange Format
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JPG – Joint Photographics Experts Group
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Non-photographic images
Images with lines and areas of solid color
Photographs
Blended images with complex colors and shapes
PNG – Portable Network Graphics
Preparing Images
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Compression
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Smaller in size but …
Does not contain full information on every pixel
320 x 240 pixel image
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225,000 bytes uncompressed … 33 seconds over 56K
27,000 bytes compressed……. 3 seconds over 56K
Preparing Images
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GIF
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“Lossless” for simple images
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Line drawings
Simple cartoons
Only stores 8 bits pixel (256 color)
Uses LZW compression algorithm patented by
Unisys
Technically, must pay royalties when using GIF
Preparing Images
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JPEG
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“Lossy” technique
Decompressed image not same as original
Exploits human vision characteristics
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Small changes in brightness more easily perceived than
small changes in color
Can trade off size for image quality
Stores 24 bits per pixel (16 million color)
Preparing Images
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PNG
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Compresses better than GIF
Lossless
Supports 48-bit true color
Format readable by all apps the same
Preparing Images
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Copyright
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Identify author of every element used
No copyright registration or notice is required
Authors own their work automatically
(Registration is a good idea for settling legal
claims)
“Fair use” exception – students in class settings,
works in the public domain, others
Assignment
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Hands-On Exercise #2, p. 103
Reformat a magazine or newspaper article for Web
use
Create the Web page and post it to your personal
Web space as “Lengel-Ch-4.html”
Only the text is required but you may include
graphics, photos, etc.
Turn in a hardcopy of the original article.
Resources
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Web Content Accessibility Guidelines:
http://www.w3.org/TR/WAI-WEBCONTENT/
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What makes a great web site?
http://www.webreference.com/greatsite.html
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Art and the Zen of Web Sites
http://www.tlc-systems.com/webtips.shtml
The Web Wizard’s Guide to
Web Design
Chapter 5
Gathering and Preparing
Multimedia Elements
Animation
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Images that “move”
Attracts viewer’s eye
May be distracting rather than
enhancing
Animation
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Creating
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Photoshop
GIF Construction Set
Apple Quicktime Player Pro
Macromedia
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Fireworks
Flash
Director
Animation
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Basic technique
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Create/import images
Arrange in sequence over time & space
Determine size, speed, transitions
Save in Web-compatible form
Animation
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Displaying
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Not every browser supports every format
Plug-ins may be required
Some user may not be comfortable
downloading or installing
Characteristics of target audience help
determine choices
Sound
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Sound is continuous
Sound
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Problem: cannot express
continuous data in a
digital medium
Instead – sample
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Take a reading every so
often
Record the reading at that
point
Sound
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Sample rates
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Telephone: 8 kHz
CD: 44 kHz
The data ends up being a long series of
numbers
44,000 per second for a CD sound track
Sound
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Problem – Lots of numbers take lots of
time
1 CD track contains 25MB
210,000,000 bits
Over a 56K modem – about an hour!
Solution: compress
Sound
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Codec: compressor-decompressor
Algorithm used to:
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Compress sound files before they are sent to user
Decompress them before they are played
Streaming
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Sound is transmitted to user continuously instead
of in a single file
Requires special server and user plug-in
Sound
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Streaming choices:
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RealAudio
QuickTime
Windows Media
Video
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Frame rate
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TV: 30 frames per second (fps)
Web: 12-15 fps
Connection controls – cable/DSL vs. dial-up
Compression
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Frame of 320 x 240 pixels = 76,000 pixels
1,228,000 bits at 16 bits per pixel
At 15 fps, one minute = 1,105,920,000 bits!
Preparing Forms and
Databases
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One-way communication with users
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Collect feedback
Survey
Request services
Form elements …
Radio
Buttons
Option Menu
Field
Text Box
Assignment
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Hands-On Exercise #4, p. 122
Add an appropriate sound or video file
to the Web page you created in the
previous assignment
Post the new page to your personal
Web space as “Lengel-Ch-5.html”
Resources
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Apple QuickTime:
http://www.apple.com/quicktime/
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RealNetworks:
http://www.realnetworks.com/
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Windows Media:
http://www.microsoft.com/windows/windowsmedia/def
ault.aspx
The Web Wizard’s Guide to
Web Design
Chapter 6
Selecting Tools, Organizing Files,
and Creating Templates
Basic Tools
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“There must be fifty ways to make a
Web page.”
Three basic types of tools
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WYSIWYG
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Code editors
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FrontPage, Dreamweaver
HomeSite, BBEdit
“Save as HTML…”
Basic Tools
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Using WORD …
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Limited design choices
Very little control over HTML generated
No ability to see underlying HTML
“Save as … ” pitfall
Basic Tools
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WYSIWYG Editors
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Pages look one way but the HTML acts another
Images appear in the editor but …
There are only links in the code
Result: organization of files, images, etc. is
crucial
Directing the Action
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So far the designer has acquired:
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Purpose of the site/page(s)
Description of the target audience
Sketch/prototype of the Web page
List of functions for each page
List of elements
Create an appropriate directory structure
Directing the Action
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Folders for:
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HTML
Images
Videos
Sounds
Pro: keeps things organized
Con: must re-create same structure on
the Web server used
Templates, Tables, and
Frames
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Template – a page that contains all the
common elements but none of the content.
Create using
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Table
Frameset