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 for device independent bitmap
From The Free On-line Dictionary of Computing (30 December 2018) :

  device independent bitmap
      (DIB) An image format in which the
     sequence and depth of pixels in the file is not specifically
     related to their layout in any particular device.  This allows
     any device dependent bitmap (DDB) image to be converted to or
     DIB format without loss of information, and this can then
     later be converted to other DDB formats for, e.g., printing or
     display.  Rather than requiring converters from each DDB
     format to all other formats, only converters to and from DIB
     are needed.
     DIB images are normally transferred in metafiles, bmp
     files, and the clipboard.
     Transferring colour bitmaps from one device to another was not
     possible in versions of Microsoft Windows earlier than 3.0.
     Application programs can build DIB images without any
     interaction with Windows.  If Windows lacks a drawing
     primitive, the application can simulate it directly into the
     DIB instead of using the existing graphics device interface
     (GDI) primitives.  Unfortunately, under Windows versions 3.0
     and 3.1, GDI cannot perform output operations directly to a
     Conversion between DIB and DDB is performed by the device
     driver.  Where the driver does not have this facility, the
     conversion is performed by GDI but only in monochrome.  DIBs
     are slower to use than device dependent bitmaps due to the
     conversions required.

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