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2. Data compression - Wikipedia

   en.wikipedia.org/wiki/Data_compression

   Data compression. In information theory, data compression, source coding, [1] or bit-rate reduction is the process of encoding information using fewer bits than the original representation. [2] Any particular compression is either lossy or lossless. Lossless compression reduces bits by identifying and eliminating statistical redundancy.

3. PDF - Wikipedia

   en.wikipedia.org/wiki/PDF

   This is an accepted version of this page This is the latest accepted revision, reviewed on 13 August 2024. Portable Document Format, a digital file format For other uses, see PDF (disambiguation). Portable Document Format Adobe PDF icon Filename extension.pdf Internet media type application/pdf, application/x-pdf application/x-bzpdf application/x-gzpdf Type code PDF (including a single ...

4. JPEG compression - Wikipedia

   en.wikipedia.org/wiki/JPEG

   JPEG. JPEG ( / ˈdʒeɪpɛɡ / JAY-peg, short for Joint Photographic Experts Group) [ 2] is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality.

5. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   It can also merge files, create new files from existing files, and move pages between files; Adobe Reader: Adobe Systems's reader which is also available for Macintosh; Safari plug-in available; Skim, an open-source (BSD licence) PDF reader and note-taker for macOS; Foxit Reader: Proprietary, freeware. Allows users to add elements to PDFs (e.g ...

6. Deflate - Wikipedia

   en.wikipedia.org/wiki/DEFLATE

   In computing, Deflate (stylized as DEFLATE, and also called Flate[ 1][ 2]) is a lossless data compression file format that uses a combination of LZ77 and Huffman coding. It was designed by Phil Katz, for version 2 of his PKZIP archiving tool. Deflate was later specified in RFC 1951 (1996). [ 3]

7. 7-Zip - Wikipedia

   en.wikipedia.org/wiki/7-Zip

   Website. www.7-zip.org. 7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as "archives". It is developed by Igor Pavlov and was first released in 1999. [2] 7-Zip has its own archive format called 7z, but can read and write several others.