A digital image is a picture converted to numerical form so that it can be stored and used in a computer. Digital images are made up of thousands of pixels , a short term for picture elements . A pixel is a tiny dot, the smallest unit of measure on the screen. The more dots, the greater the detail of the image displayed. A higher number of pixels produces a higher quality image.
Color resolution describes the number of colors the monitor can display at one time.
More colors produces more lifelike images. Color resolution is measured by the number of bits used to store the color information for each pixel. Keep these concepts in mind and find out what kind of video display system your computer has, you need to know these in order to get the right picture viewer and picture files for your computer. Picture Formats Picture files have specific file extensions . A picture file extension stands for the format of the picture or the standard that was used to make the computer readable picture.