Page 286 - Open Soource Technologies 304.indd

Web Technologies-I

Notes As the UU computer graphics laboratory was attracting people from all over, John Warnock
was one of those early pioneers; he would later found Adobe Systems and create a revolution
in the publishing world with his PostScript page description language. Tom Stockham led
the image processing group at UU which worked closely with the computer graphics lab.
Jim Clark was also there; he would later found Silicon Graphics, Inc.

The first major advance in 3D computer graphics was created at UU by these early pioneers,
the hidden-surface algorithm. In order to draw a representation of a 3D object on the screen,
the computer must determine which surfaces are “behind” the object from the viewer’s
perspective, and thus should be “hidden” when the computer creates (or renders) the image.
Questions:
1. Why the graphics was introduced? How it was developed?

2. Write the time to time advancement in graphics.

Self Assessment
Multiple choice questions:
5. Which is not the basic image generation process?
(a) Creating the image.

(b) Adding graphics and text to the canvas.
(c) Displaying or saving the image.
(d) Deleting the images.
6. The ImageCreate( ) function can create
(a) 254-colour image (b) 256-colour image
(c) 512-colour image (d) None of these
7. gif stands for

(a) Graphics Interchange Format (b) Global Interchange Format
(c) Grand Interchange Format (d) None of these
8. png stands for
(a) Pure Network Graphic (b) Portable Network Graphic
(c) Pre Network Graphic (d) None of these
Fill in the blanks:
9. The background colour of an editable canvas can be set by ..................... .

10. Cartesian has ..................... perpendicular real number lines that divide the plane into four
quadrants.
11. An image is a rectangle of ..................... that have various colours.

11.9 Summary

• The process and art of combining text and graphics and communicating an effective
message in the design of logos, graphics, brochures, newsletters, posters, signs, and any
other type of visual communication is the formal, short definition of graphic design.
• The GD library is used for dynamic image creation. From PHP we use with the GD library
to create GIF, PNG or JPG images instantly from our code. This allows us to do things such

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