Graphics : Introduction

Computer graphics or images are often used either by themselves or to enhance the quality of other documents, for example a desktop published document. There are three distinct types of package which can be used to create images on a computer. They are :

Painting Packages	This is the most basic type of graphics package. These packages allow you to paint onto the screen as if it was a canvas. Unfortunately they produce files which take up a lot of storage space and painted images are difficult to edit.
Drawing / Vector Drawing Packages	These are more sophisticated than painting packages. They store images as a set of objects which can be easily edited.
Computer Aided Design (CAD) Packages	Very advanced, highly accurate packages which can be used for designing three dimensional objects such as houses and machinery.

Many special hardware devices are available to help in the production of computer graphics. These include :

• Scanners and digital cameras which can transfer real-world images into the computer.
• Graphics tablets which can be used to accurately transfer drawings of objects into a computer.
• Large high-resolution monitors which allow detailed work to be carried out on large images.
• Plotters and high-quality computer printers for obtaining accurate output on paper.

GCSE ICT Companion 04 - (C) P Meakin 2004