The intensity of the beam is varied to create a pattern of illuminated spots, as it moves across each row. It goes from left to right in a row and in this way from top to bottom. In this method, the electron beam is made to sweep around the screen. It is capable of displaying various parts filled with patterns and solid colors Random scan is suitable for engineering and scientific graphics and also limited to line drawing applications Raster scan is suitable for generating realistic display of an object and also capable of representing shading and color areas It produces smooth line as CRT beam directly traces line path It produces Zig-Zag lines as discrete values are plotted It uses mathematical equation in order to render an image or object on to the screen It uses pixels in order to render an image or object on to the screen It can't be used to draw a realistic picture It can draw realistic pictures as it has the capability to generate different shades Picture definition is stored as a set of line commands called Refresh Display File Picture definition is stored in Refresh Buffer also called Frame Buffer Refresh Rate depends on the number of lines to be displayed i.e 30 to 60 times per second Refresh rate varies from 60 to 80 frame per second The electron beam is directed only towards the part of the screen where a picture is required to be drawn The electron beam is directed from top to bottom and one row at a time on screen, but it is directed towards the entire screen It stores picture definition as a set of line commands which results in high resolution Picture definition is stored as an intensity value which results in it to have less Resolution
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