Bitmap . computer graphics



In  computer graphics,  a  bitmap or  pixmap  is a  type of  memory
organization or image file format used to store digital images. The
term  bitmap  comes  from  the  computer  programming  terminology,
meaning just a map of bits,  a spatially mapped array of bits. Now,
along with pixmap,  it commonly refers to the  similar concept of a
spatially mapped array  of pixels. Raster images in  general may be
referred   to  as   bitmaps  or   pixmaps,  whether   synthetic  or
photographic, in  files or memory.   In certain contexts,  the term
bitmap implies one  bit per pixel, while pixmap  is used for images
with multiple bits per pixel.[1][2]

Many  graphical  user  interfaces  use bitmaps  in  their  built-in
graphics subsystems;[3] for example, the Microsoft Windows and OS/2
platforms'  GDI subsystem, where  the specific  format used  is the
Windows and  OS/2 bitmap file  format, usually named with  the file
extension of .BMP (or  .DIB for device-independent bitmap). Besides
BMP,  other  file  formats   that  store  literal  bitmaps  include
InterLeaved Bitmap  (ILBM), Portable Bitmap (PBM),  X Bitmap (XBM),
and  Wireless Application Protocol  Bitmap (WBMP).  Similarly, most
other image  file formats, such as  JPEG, TIFF, PNG,  and GIF, also
store bitmap images  (as opposed to vector graphics),  but they are
not  usually referred  to  as bitmaps,  since  they use  compressed
formats internally.


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