Among all computer graphics programs the Rater graphics is a data structure that represent usually rectangular grid of pixels, point of color and viewable via a monitor. Raster images can be stored in image files with varying file formats. A bitmap is a format that is used for storage in the display’s video memory. It is technically characterized by the height of the image in pixels by the number of bits per pixel. It can also represent a color depth which determines the number of color. In the printing industry raster graphics is also known as Contones. The word raster has been come from the Latin word. It is originally refers to the video monitors which paint the image by magnetically steering a focused electron beam. In other term it also refers to a rectangular grid of pixels. The raster graphics can scale up to an arbitrary resolution without loss of apparent quality.
Word “raster” has the origins in Latin rastrum (rake) that is been derived from the radere (scrape). It referred originally to raster scan of the cathode ray tube video monitors that paint an image by line and by magnetically steering the focused electron beam. And by association, it came to refer to the rectangular grid of the pixels. See rastrum, the device to draw the musical staff lines.
The raster graphics are the resolution dependent and they will not scale up to the arbitrary resolution with no loss of the apparent quality. The property has with capabilities of the vector graphics that very easily scale to a quality of device rendering. The raster graphics deal practically than the vector graphics with the photographs and the photo realistic images, whereas the vector graphics serve much better for typesetting and for the graphic design.