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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 l.jpg

Computer Graphics

Prepared by Dragon Lee

1 January 2003


Use of computer graphics l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
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 l.jpg
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/


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