Bitmap: Difference between revisions

Revision as of 10:17, 18 October 2023

Revision as of 12:04, 24 November 2023

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The [[X Window System]] uses a similar [[X Bitmap|XBM]] format for [[black-and-white]] images, and [[X PixMap|XPM]] (''pixelmap'') for color images. Numerous other uncompressed bitmap file formats are in use, though most not widely.<ref>{{cite web |url= http://www.file-extensions.org/filetype/extensions/name/Bitmap+image/

|title= List of bitmap file types |work= Search File-Extensions.org}}</ref> For most purposes standardized compressed bitmap files such as [[GIF]], [[Portable Network Graphics|PNG]], [[TIFF]], and [[JPEG]] are used; [[lossless compression]] in particular provides the same information as a bitmap in a smaller file size.<ref>{{cite book |title= Communicating Science Effectively: a practical handbook for integrating visual elements |author1=J. Thomas |author2=A. Jones |publisher= IWA Publishing |year= 2006 |isbn= 1-84339-125-2 |url= https://books.google.com/books?id=xrgkojGgwDYC&q=gif+png+tiff+jpeg+common&pg=PA26}}</ref> TIFF and JPEG have various options. JPEG is usually [[lossy compression]]. TIFF is usually either uncompressed, or lossless [[Lempel-Ziv-Welch]] compressed like [[GIF]]. PNG uses [[deflate]] lossless compression, another [[Lempel-Ziv]] variant.

There are also a variety of "raw" image files, which store raw bitmaps with no other information; such raw files are just bitmaps in files, often with no header or size information (they are distinct from photographic [[raw image format]]s, which store raw unprocessed sensor data in a structured container such as [[TIFF]] format along with extensive image [[metadata]]).