P ractice Section 3. That area will be discussed in later sections. This section looks purely at the nature of digital images. These properties can be considered as a series of instructions that are 'played back' by the drawing engine to reconstruct the image on the output device. Typical examples of vector based images are technical illustrations, floor plans, maps, diagrams and charts.
Pixels are the familiar square features seen when a digital image is zoomed into.
Each pixel contains the colour information about that point of the image and the combination of pixels constructs the entire image. Raster image file sizes tend to be large, because of the amount of information each pixel holds and the number of pixels necessary to make a high fidelity image. An example would be an architectural CAD package that allows photo-realistic images to be rendered onto a vector structure to add realism to computer models. The first defining element of any digital image is thus its file size , the amount of computer-code information within it. In general, the larger the file size the higher the quality of the image, the greater the storage requirements and the slower the network delivery speeds possible.