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CH11 Graphics Notes

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CH11 Graphics Notes Presentation Transcript

  • 1. Graphics CGS2826 Web Design Program in Interdisciplinary Computing Florida State University From Web Style Guide, Chapter 11: Graphics
  • 2. What are the most effective uses of graphics, and what’s the best way to integrate words and images into an understandable story for the user?
  • 3. Roles of Web Graphics
    • Define site boundaries
    • Provide and enhance content: illustrations, diagrams, charts, visualizations, word art
  • 4.  
  • 5. Characteristics of Web Graphics
    • RGB model is called “additive” because a combination of the three pure colors—red, green, and blue—“adds up” to white light.
    • 16.8 million colors that are theoretically possible in a 24-bit or 32-bit display screen .
    • 72 to 96 pixels per inch (ppi)
  • 6. Gamma The degree of contrast between the midlevel gray values of an image.
  • 7. Graphics and Bandwidth
    • Some web users access the Internet via modem, slow wireless connection, or cell phone network, and others view pages on the small display of a handheld device such as a cell phone or an iPod Touch. This reality imposes limits on the file size and physical dimensions of web graphics.
  • 8. Graphics File Formats
    • GIF – 8 bit, 256 colors
      • Compression: lossless, ideal for logos
      • Dithering: reducing color amnt to 256
      • Interlaced: loads entire image from low to high rez
      • Transparent: select background color as trans
    • JPEG – 24 bit, 16.8 million colors
      • Great for photos
    • PNG
      • Combines best of GIF and JPEG but may lack support
  • 9. GIF Dithering
  • 10.  
  • 11.
    • Advantages of GIF files
    • gif is the most widely supported graphics format on the web
    • gifs of diagrammatic images look better than jpegs
    • gif supports transparency and interlacing
    • Advantages of JPEG images
    • jpeg achieves huge compression ratios, which mean faster downloads
    • jpeg produces excellent results for most photographs and complex images
    • jpeg supports full-color (24-bit, true-color) images
  • 12. Display vs. Print Four-color printed images are separated into four subtractive printing colors (cyan, magenta, yellow, and black).
  • 13. Display vs. Print
  • 14. Coding graphics
    • Include height and width specs for faster loading pages
    • Include “alt” as a fall back
    <img src=&quot;up.gif&quot; height=&quot;10&quot; width=&quot;10&quot; alt=&quot;Go to top of page&quot;>
  • 15. Color Combos http://www.colorsontheweb.com/colorcontrast.asp
  • 16. Harmonious Combos