Digitization is the process of converting information on physical media to digital format. In information systems, digitization usually refers to the process of converting text or an image, such as a photograph or map, into a binary format, by hand entry or with a scanning device, so that the result can be stored and retrieved for display. This is often done by scanning a paper copy and saving it as a raster image (TIFF or another format). Optical character recognition software can then be used to change the image to searchable text, which may be saved in PDF format or as plain text.
Preservation and copyright are two large issues for the digital library, as materials can be duplicated and distributed easily. Conversely, digital storage is debatable as an archival medium, unlike proven analog technologies such as microfilm. See Digital Dark Ages and fair use.