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                                                            In library and archival science, digital preservation is a formal endeavor to ensure that digital information of continuing value remains accessible and usable. It involves planning, resource allocation, and application of preservation methods and technologies, and it combines policies, strategies and actions to ensure access to  reformatted and "born-digital " content, regardless of the challenges of media failure and technological change. The goal of digital preservation is the accurate rendering of authenticated content over time. According to the Harrod's Librarian Glossary , digital preservation is the method of keeping digital material alive so that they remain usable as technological advances render original hardware and software specification obsolete (Nabeela).      

Cost benefits        Digital formatting programs can be costly and have huge start-up costs, especially if done in-house. A hypothetical case study presented at the 2003 National Initiative for a Networked Cultural Heritage (NINCH) Symposium quoted a small digitization project as costing $16,332, if outsourced to a vendor, or about $100,000 (to purchase software and hardware for an in-house program). It is worth these prices when one considers the long-term financial benefits of digital reformatting. A cost-benefit study presented by Lee (2001) found that it costs about $5.40 to digitize a 10-page article (with unlimited free duplicates), much less than the total accumulated cost of repeatedly duplicating the physical master with a photocopier. Function as a preservation strategy          Digital reformatting is not unanimously accepted as a viable, long-term preservation strategy. The  Association of Research Libraries recognized digitization as a viable preser

                      Digital reformatting is the process of converting analogue materials into a digital format as a surrogate of the original. The digital surrogates perform a preservation function by reducing or eliminating the use of the original. Digital reformatting is guided by established best practices to ensure that materials are being converted at the highest quality. Imaging Standards          The Library in Congress has been actively reformatting materials for its American Librery  project and developed best standards and practices pertaining to book handling during the digitization process, scanning resolutions, and preferred file formats. Some of these standards are: The use of ISO 16067-1 and ISO 16067-2 standards for resolution requirements. Recommended 400 ppi resolution for OCR ed printed text. The use of 24 bit color when color is an important attribute of a document. The use of the scanning device's maximum resolution for digita