Text documents can be digitized in three ways; copying, scanning and taking pictures with a digital camera. In the case of scanning and shooting must be carried out and Optical Character Recognition (eng. OCR - Optical Character Recognition). Rewrite the longest and most expensive of the listed procedures and most often used in manuscripts, printed text low-contrast or printed text that are attributed to handwritten notes. Scanning text can be made to the original or on microfilm. Scan can be in color or in black and white. If after the scan carried out OCR text to be scanned in black and white document to achieve optimum contrast. Take a picture of the text is done with a digital camera. Most often are materials that can be damaged.
A picture to be digitized by scanning or photographing. If scanning is digitized, it is necessary to select the scanner as higher resolution. If the material is of a suitable type, ideal use rotating scanners that achieve significantly higher quality than conventional, flatbed, scanners. If the material is large format, are used (high quality) digital cameras. When photographing image material is extremely important quality lighting. The rule is made three versions of each digitized image; one color with maximum resolution, the other with a smaller number of shades or in grayscale (eng. grayscale) that will be suitable for transmission network, and the third, pictures (also called. thumbnail). In order to achieve the best possible quality digitized image material, it is necessary to pay attention to the three most important features: Resolution - number of pixels or dots per inch, with digitization resolution indicates the number of sampling template during the scan Bit depth point - any point in the digital slizi associated with the binary series. The number of digits of this series is called the bit depth color - before digitizing is essential to determine how it will use the material; only to store, monitor, or will exist, and the ability to print. It should adjust the color display system. The most common systems cu RGB, CMYK and CIELAB
