MAP DISADVANTAGE
map images have two disadvantages. In terms of digital storage, they are space –hungry. The color values of every in the image – typically several million – be identified and recorded. This large amount of information can be reduced to degree by using ‘data compression’ techniques sch as LZW or JPEG, but only a point. Second, because a bitmap has no structure other than a sequence assels arranged in a grid when you enlarge pixels just get bigger. The viewer will lose the illusion of a smooth image and aware be aware of the individual coloured. Unless the image can be recreated from scratch at a higher resolution (for example by re-scanning an analogue photo), never scale up a bitmap beyond a in point without its visual quality ring badly.