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| AFTER COMPLETING THIS CHAPTER, YOU WILL BE ABLE TO: | |
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Recognize the commonly found Internet file types. |
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Understand how browsers launch different plug-ins and helper applications to play certain types of files. |
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Explain why MIDI files occupy so much less file space than waveform audio files. |
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Understand the concept of a markup language. |
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Know the difference between the GIF and JPEG graphics formats. |
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Understand why the audio/video interleave (AVI) file format was designed to give audio the priority when a computer does not have enough processing time to show all of the frames of a movie. |
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Explain the difference between lossy and lossless compression methods. |
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Understand how animated GIFs can bring a Web page to life. |
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Explain the concept of a JavaScript. |
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Understand the purpose of Adobe's Portable Document Format. |
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Know the rule search engines use to decide whether to include or exclude active server pages (ASP) files from a search. |
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Avoid the common pitfall of changing a filename extension when you rename a file. |
| INTERNET LITERACY
RESOURCES: |
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Text Formats |
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Find an example of each of these formats. How does an ascii text file appear different from an html file? What do you notice about the image you are able to view and the tools that Adobe provides? |
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ASCII |
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HTML |
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Image Formats |
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Find a sample of each of the image file formats: gif, jpeg and png. Do you notice any difference in the images? |
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GIF |
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JPEG |
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PNG |
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Waveform Audio Formats |
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Follow the links below to try out the different audio formats. Which ones played right away on your computer? Did you have to add any software to get others to play? |
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General resources |
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WAV |
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RA and RAM |
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AIF, AIFF, AIFC |
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AAC, M4A, M4P |
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WMA |
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MP3 |
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Follow the links to sample an MP3 file. How did it compare to MIDI and to the other formats? What information can an MP3 file hold that the others cannot? |
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Specs |
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Resources |
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MIDI Synthesizer Format (MIDI) |
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MIDI files provide a much different musical experience from the ones you've just tried. How did they differ? |
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Specs |
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Indexes |
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Video Formats |
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For video, you'll need to add some software to your computer to view the files if you haven't done so already. Follow each of the links below to test your computer for each kind of video format. If you need to, download and install the correct software to view the sample files. |
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AVI |
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MOV and QT |
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ASF and WMV |
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MPG, MPEG, and MPE |
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RM |
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Animation Formats |
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Some animation formats should play immediately in your browser; others will need added software. Which of these formats required you to download additional software? Were you able to view examples of each type of animation? |
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Animated GIFs |
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JavaScript |
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QuickTime |
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Macromedia Flash® and ShockWave® |
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Active Server Pages (ASP) |
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Have you noticed any difference between .asp pages and .html pages? Why do you think that is? |
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Specs |
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Exercises |
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MIDI versus Wave |
Compare classic.mid (17KB) to snippet.wav (17KB). |
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Case |
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Use these links to find files to test on your target computer as you work through this case. |
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MPEG movie
(7 MB) |
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Copyright © 2005 by the University of Delaware. All rights reserved. Site design and development by Pat Sine. Please send all comments to Pat Sine: sine@udel.edu |
