... pixel. If it is set to 1, the pixel is illuminated. If the corresponding memory location contains 0, the pixel is left dark. A binary representation in RAM The equivalent screen representation Figure 1.Bitmapped representation of letter T coding in RAM and corresponding image on screen For colour monitors, more than one bit is required to keep information about a pixel because apart from illuminated or not setting, colour specification is also required. Monitors that are capable of displaying 16 colours only would require 4 bits of memory per pixel (16 = 24). Figure out how many bits of memory per pixel are required to give a choice of 512 colours? Thus the required size of visual memory depends on the number of pixels on the screen (resolution factor) and on the number of colours available. If you are buying a modern monitor which is bigger than 14", it is desirable to have at least 2 ...

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