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File Formats

Each image stored can be saved in a variety of different formats.



The TIFF format is the standard in document imaging and document management systems.  It uses CCITT Group IV 2D compression which supports black-and-white (bitonal, monochrome) images. In high-volume storage scanning, documents are scanned in black and white (not in colour or in grayscale) to conserve storage space. An average A4 scan produces 30 KB of data at 200 dpi (dots per inch) and 50 KB of data at 300 dpi.



Portable Document Format (PDF) is a file format created by Adobe Systems in 1993 for document exchange. PDF files have smaller file sizes compared to their TIFF equivalent but require Adobe Acrobat Reader to be installed before the images can be accessed. Using the PDF file format, you have the ability to have OCR (Optical Character Recognition) to help search within the document at a recommended resolution of 300 dpi.



The Joint Photographic Experts Group format is especially useful when storing large quantities of colour and greyscale images. The JPEG format allows compression of documents (smaller file sizes) in relation to having minor losses in image quality.


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