| slovo | definícia |
bitmap
(encz) | bitmap,bitmapa n: Zdeněk Brož |
bitmap
(encz) | bitmap,bitová mapa n: Zdeněk Brož |
bitmap
(wn) | bitmap
n 1: an image represented as a two dimensional array of
brightness values for pixels [syn: bitmap, {electronic
image}] |
bitmap
(foldoc) | bitmap
A data file or structure which
corresponds bit for bit with an image displayed on a
screen, probably in the same format as it would be stored in
the display's video memory or maybe as a {device independent
bitmap}. A bitmap is characterised by the width and height of
the image in pixels and the number of bits per pixel which
determines the number of shades of grey or colours it can
represent. A bitmap representing a coloured image (a
"pixmap") will usually have pixels with between one and
eight bits for each of the red, green, and blue components,
though other colour encodings are also used. The green
component sometimes has more bits that the other two to cater
for the human eye's greater discrimination in this component.
See also vector graphics, image formats.
(1996-09-21)
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| | podobné slovo | definícia |
bitmapa
(czen) | bitmapa,bitmapn: Zdeněk Brož |
bitmap display
(foldoc) | bitmap display
bitmapped display
A computer output device where each pixel
displayed on the monitor screen corresponds directly to one
or more bits in the computer's video memory. Such a
display can be updated extremely rapidly since changing a
pixel involves only a single processor write to memory
compared with a terminal or VDU connected via a serial
line where the speed of the serial line limits the speed at
which the display can be changed.
Most modern personal computers and workstations have
bitmap displays, allowing the efficient use of {graphical user
interfaces}, interactive graphics and a choice of on-screen
fonts. Some more expensive systems still delegate graphics
operations to dedicated hardware such as {graphics
accelerators}.
The bitmap display might be traced back to the earliest days
of computing when the Manchester University Mark I(?)
computer, developed by F.C. Williams and T. Kilburn shortly
after the Second World War. This used a storage tube as its
working memory. Phosphor dots were used to store single
bits of data which could be read by the user and interpreted
as binary numbers.
[Is this history correct? Was it ever used to display
"graphics"? What was the resolution?]
(2002-05-15)
|
bitmap font
(foldoc) | bitmap font
raster font
A font where each character is stored as an array
of pixels (a bitmap). Such fonts are not easily scalable,
in contrast to vectored fonts (like those used in
PostScript).
[Examples?]
(1995-02-16)
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bitmapped display
(foldoc) | bitmap display
bitmapped display
A computer output device where each pixel
displayed on the monitor screen corresponds directly to one
or more bits in the computer's video memory. Such a
display can be updated extremely rapidly since changing a
pixel involves only a single processor write to memory
compared with a terminal or VDU connected via a serial
line where the speed of the serial line limits the speed at
which the display can be changed.
Most modern personal computers and workstations have
bitmap displays, allowing the efficient use of {graphical user
interfaces}, interactive graphics and a choice of on-screen
fonts. Some more expensive systems still delegate graphics
operations to dedicated hardware such as {graphics
accelerators}.
The bitmap display might be traced back to the earliest days
of computing when the Manchester University Mark I(?)
computer, developed by F.C. Williams and T. Kilburn shortly
after the Second World War. This used a storage tube as its
working memory. Phosphor dots were used to store single
bits of data which could be read by the user and interpreted
as binary numbers.
[Is this history correct? Was it ever used to display
"graphics"? What was the resolution?]
(2002-05-15)
|
device independent bitmap
(foldoc) | device independent bitmap
DDB
DIB
(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
DIB.
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.
(1996-09-20)
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wireless bitmap
(foldoc) | wireless bitmap
WBMP
(WBMP) A bitmap for display on a
WAP mobile phone.
Currently (2001) the only type of WBMP file defined is a
simple black-and-white image file with one bit per pixel
and no compression.
[WAP Forum (http://wapforum.org/), "WAP-190-WAE-Spec" or
"Wireless Application Protocol, Wireless Application
Environment Specification"].
(2001-05-23)
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