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Raster-scan1)raster displays have less resolutio.

2)the lines producced are ziz-zag as the plotted values are discrete.

3)high degree realism is achived in picture with the aid of advanced shading and hidden surface technique.

4)decreasing memory costs have made raster systems popular.

Random scan1)random displays have high resolutions since the picture definition is stored as a set of line drawing commands and not as a set of intensity values.

2)smooth lines are produced as the electron beam directly follows the line path.

3)realism is difficult to achieve.

4)random-scan system's are generally costlier.

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