What are Raster Graphics?
Raster graphics are usually known as bitmap images. These graphics are made up of a grid of pixels. Raster graphics contain a fixed number of pixels and the information about the color and location of each pixel. Raster graphics are resolution-dependent, so they lose details, when scaled. The advantage of raster graphics is that they have an ability to represent continuous-tone images because they can produce subtle gradations of shades and color.
Raster graphics are digital images represented by a matrix or grid of pixels commonly called a bitmap. Each pixel or dot displays a unique color and together all of these colored dots create an image. Every pixel in a bitmap is stored as one or more bits in computer memory. Raster graphics with a greater number of colors and pixels will require more bits and take up more memory. Typical file formats for raster graphics include .jpg, .gif, .tiff, and .bmp. Since raster graphics are represented in a grid structure, the width and height are usually indicated by the number of rows and columns rather than a particular unit of measurement. The size of an image might be described as 640 x 480 meaning that there are 640 pixels in a row and 480 pixels in a column. The resolution or degree of sharpness present in an image is calculated by determining the number of pixels per inch (PPI) or dots per inch (DPI). A higher resolution raster graphic will have smaller pixels that result in a more detai
