Graphic Capture

• Image Scanners are popular examples of graphic capture devices. When a page of text already exists, like the page that you are reading now, it can be directly put into a computer using a scanner.
• Scanner can be used to input not only the texts, but also the photographs, drawings and so on. Image Scanners  (Gray-scale or colour) digitise the pictures (which are analog data). The resulting bitmapped images (Each pixel has a collection of bits that define its colour) can be easily modified by graphics programs. The resolution of bitmapped images is measured in dpi, i.e. dots per inch.