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Hardware Components of Video Still Images A graphic can be stored as a bitmap or as a vector image For multimedia purposes the majority of uses are filled by bitmap images Bitmaps A bitmapped image is one in which every pixel on the screen or in the image is mapped to a bit of data With a monochrome picture there is a direct correlation between the number of screen pixels and the number of bits to store the picture Each bit only stores whether the pixel is white or black With colour pictures each pixel is represented by a group of bits that determine the pixels colour Vectors A vector image is one where the data represents not pixels but objects These objects could be text circles squares or such Bitmapping is far easier to use complex coloured images such as digitised pictures whereas a simple piece of computer-drawn clip-art would be much more efficiently stored as a vector oriented image If a large bitmapped graphic could be easily converted to a vector image without loss of quality which is not often the case then vector image would most likely be smaller in size As far as bitmapped images go the only difference between one file format and another is the way data is compressed and how much extra information is needed such as height and width of the picture number of colours etc This information is normally stored in a portion of the file called a header Picture Scaling The benefits of vector files lie in their scalability The user may wish to expand or shrink a picture so that it fits into a particular space in a document This should be achieved with no loss of detail or picture distortion Scaling up a picture that contains a straight
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