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Computer Graphics - PowerPoint PPT Presentation


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Computer Graphics Graphics software allows users to create and edit graphics Graphics can be divided into 2 types: Bitmap (Raster) Graphics Vector Graphics Pixel Bitmap Graphics A bitmap graphic is represented by a dot pattern Each dot is called a Pixel (picture element)

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PowerPoint Slideshow about 'Computer Graphics' - Audrey


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computer graphics
Computer Graphics
  • Graphics software allows users to create and edit graphics
  • Graphics can be divided into 2 types:
    • Bitmap (Raster) Graphics
    • Vector Graphics
bitmap graphics

Pixel

Bitmap Graphics
  • A bitmap graphic is represented by a dot pattern
  • Each dot is called a Pixel (picture element)
  • A pixel has a single color only
vector graphics
Vector Graphics
  • A vector graphic is divided into objects
  • Each object is defined by the method of drawing it

This picture contains 3 objects:a line, a circle and a rectangle

how to draw the circle

Fill color

Radius

Line color

Line thickness

Center

How to draw the circle?
  • The circle is represented by a mathematical formula:

Circle(50,100,150,black,1,green)

A few bits is enough to save the properties of this circle!

advantages of using vector graphics
Advantages of using Vector Graphics:
  • It requires less storage space
  • When a vector graphic is enlarged, it remains intact (no distortion)

Enlarging a Vector Graphic

The line is as smooth as before

Enlarging a Bitmap Graphic

The line thickened & saw-tooth resulted

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Disadvantages of using Vector Graphics:

  • Vector graphics cannot look as realistic as bitmap pictures.
common graphic file format
Common Graphic File Format

Bitmap (.bmp) - a common graphic file format;can be read by almost all programs

Gif (.gif) - a compressed bitmap file format. It can support up to 256 colors

Jpeg (.jpg) - a lossy compressed bitmap file format. But it can support up to 16.7 million colors

(because it applies lossy compression, some of the details is lost!)

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Jpeg Format (5kB)

Gif Format (26kB)

creating graphics
Creating Graphics
  • Painting Software
  • Drawing Software
  • Presentation Software
painting software
Painting Software
  • A painting program creates an image by setting the colors of individual screen pixels.
  • The pictures created by a painting program are thus bitmap graphics.
  • Example: Paintbrush, PhotoImpact
drawing software
Drawing Software
  • A drawing program generates formulae to represent the objects drawn by users. The pictures created are thus object-oriented graphics.
  • In using a drawing program, you are provided with a variety of drawing tools.
  • Example: Corel Draw and Powerpoint.
presentation software
Presentation Software
  • A presentation program is a drawing program that help users to prepare the essential components of a presentation - presentation outlines, slides, audience handouts and speaker’s notes.
  • Users can also use a presentation program to run an on-screen slide show.
  • Example: Microsoft PowerPoint.
importing graphics
Importing Graphics
  • Clip Art Library
  • Image Scanner
  • Screen Capture

Outputting Graphics

  • Printer
  • Plotter