There are few methods for getting digital images into a computer system. Glad you asked. A vector image can be reduced or enlarged without any loss in quality. Vector images are either created in a vector-drawing program or have been converted from a bitmap image. A bitmap image is made up of pixels , or tiny squares, on a fixed grid.
Bitmap images are resolution dependent.
The higher the resolution, the more tiny pixels exist on the image's grid and the more detail an image can display. If a bitmap image is enlarged too much or if an image with screen resolution is used in a printed project, you can see the rows of pixels that make up the image. Images can come in a variety of formats. Common image file formats include TIFF , PICT , BMP , WMF , GIF , JPEG and EPS . Each format is best-suited for a particular use.