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2. DjVu - Wikipedia

   en.wikipedia.org/wiki/DjVu

   DjVu has been promoted as providing smaller files than PDF for most scanned documents. [3] The DjVu developers report that color magazine pages compress to 40–70 kB, black-and-white technical papers compress to 15–40 kB, and ancient manuscripts compress to around 100 kB; a satisfactory JPEG image typically requires 500 kB. [ 4 ]

3. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   A PDF file is organized using ASCII characters, except for certain elements that may have binary content. The file starts with a header containing a magic number (as a readable string) and the version of the format, for example %PDF-1.7. The format is a subset of a COS ("Carousel" Object Structure) format. [24]

4. Document file format - Wikipedia

   en.wikipedia.org/wiki/Document_file_format

   DjVu — file format designed primarily to store scanned documents [3] DocBook — an XML format for technical documentation; HTML (.html, .htm), (open standard, ISO from 2000), in combination with possible image files referred to. FictionBook (.fb2) — open XML-based e-book format

5. Optical character recognition - Wikipedia

   en.wikipedia.org/wiki/Optical_character_recognition

   Video of the process of scanning and real-time optical character recognition (OCR) with a portable scanner. Optical character recognition or optical character reader (OCR) is the electronic or mechanical conversion of images of typed, handwritten or printed text into machine-encoded text, whether from a scanned document, a photo of a document, a scene photo (for example the text on signs and ...

6. PDF/E - Wikipedia

   en.wikipedia.org/wiki/PDF/E

   ISO 24517-1:2008 is an ISO Standard published in 2008.. Document management—Engineering document format using PDF—Part 1: Use of PDF 1.6 (PDF/E-1) This standard defines a format (PDF/E) for the creation of documents used in geospatial, construction and manufacturing workflows [1] and is based on the PDF Reference version 1.6 from Adobe Systems.

7. Book scanning - Wikipedia

   en.wikipedia.org/wiki/Book_scanning

   Common file formats are DjVu, Portable Document Format (PDF), and Tag Image File Format (TIFF). To convert the raw images optical character recognition (OCR) [1] is used to turn book pages into a digital text format like ASCII or other similar format, which reduces the file size and allows the text to be reformatted, searched, or processed by ...