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Computer Graphics Prepared by Dragon Lee 1 January 2003 Use of Computer Graphics Movies Games Medical Imaging Computer Aided Design Scientific Visualization Graphics User Interfaces Presentation http://www.ethereal3d.com/Portfolio/Animations/index.html

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computer graphics

Computer Graphics

Prepared by Dragon Lee

1 January 2003

use of computer graphics
Use of Computer Graphics
  • Movies
  • Games
  • Medical Imaging
  • Computer Aided Design
  • Scientific Visualization
  • Graphics User Interfaces
  • Presentation

http://www.ethereal3d.com/Portfolio/Animations/index.html

http://www.cs.utah.edu/research/areas/graphics/

concept terminology
Concept & Terminology
  • Pixel – basic element of a bitmap graphics.
  • Resolution – the no. of pixels in horizontal and vertical dimension.
  • Colors – the RED, GREEN, BLUE value of a pixel.
  • Gray Levels – 256 gray levels
  • Objects – graphics elements that can move freely.
types of computer graphics
Types of Computer Graphics
  • Bitmap Graphics
    • Based on pixels
    • Does not scale well
    • Jagged(起鋸齒) after enlargement
  • Vector Graphics
    • Based on mathematical formula
    • Scale well
creating editing a graphic image
Creating & Editing a graphic image
  • Drawing primitive:
    • Dots, lines, curves, circles, ellipse, rectangles.
  • Painting:
    • Color fill
  • Editing operations:
    • Scale
    • Transform
    • Group and Ungroup
    • Merge (combine all objects/layers into background layer)
    • Flip horizontal / vertical
    • Rotate
presentation graphics
Presentation Graphics
  • Presentation Software
    • Eg. Microsoft PowerPoint
  • Reminder on using presentation software
    • Apply a template to save your valuable time.
    • Use transition effects and building effects to enrich your presentation visually.
    • Control the time of your slide show to achieve automation.
    • Add Sounds to your presentation
common graphics format
Common graphics format
  • GIF (Widely used on the Internet)
  • Animated GIF (Widely used on the Internet)
  • JPG/JPEG (Widely used on the Internet)
  • Bmp (Windows graphics format)
  • Psd (PhotoShop file format)
  • Ufo (PhotoImpact file format)
  • Ai (adobe illustrator – Vector)
  • Fla / swf (Macromedia Flash -- Vector)
reference
Reference
  • The Mathematics of Web Design
    • http://www.math.arizona.edu/~mcenter/maw/web/
  • VRML Sites
    • http://www.itl.nist.gov/iaui/ovrt/vrmlexamples.html
    • http://www-vrl.umich.edu/NewMidfield/index.html
    • http://www.nyx.net/~cmaarbj/vrml/
  • http://www.sci.utah.edu/