1RAS_FORMATS(1NCAR)                 NCAR VIEW                RAS_FORMATS(1NCAR)
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NAME

6       ras_formats  - Information on raster formats supported by NCAR Graphics
7       and NCAR View.
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SYNOPSIS

10       Abekas A60, AVS, Generic Binary, HDF, HPPCL, NRIF, Sun, SGI, and XWD.
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DESCRIPTION

13       NCAR Graphics and NCAR  View  applications  are  built  upon  a  common
14       library  that provides read and write access to raster imagery. The ta‐
15       ble below summarizes the support that is provided for all the different
16       formats.   Note  that  a  format may be writeable but not readable, and
17       that a compressed image may be readable but not writeable. By  default,
18       a raster image is written as compressed if possible. For those applica‐
19       tions that key upon the filename to determine  the  raster  format,  or
20       allow  a -ifmt or -ofmt, the extension, as listed below, should be used
21       without the "."  in front (e.g. use "hdf", not ".hdf").
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23       Format(extensions)   Encoding    Input   Output   Compression
24       ──────────────────────────────────────────────────────────────
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26       Abekas A60(.a60)     RGB24        Yes     Yes        None
27       AVS(.avs)            RGB24        Yes     Yes        None
28       HDF(.hdf)            Indexed-8    Yes     Yes       In/Out
29       HDF(.hdf)            Direct-24    Yes     Yes       In/Out
30       HPPCL(.hppcl)        Indexed-8    No      Yes         Out
31       NRIF(.nrif)          Bilevel      No       No        None
32       NRIF(.nrif)          Indexed-8    Yes     Yes       In/Out
33       NRIF(.nrif)          Direct-24    Yes     Yes       In/Out
34       Sun(.sun)            Indexed-8    Yes     Yes         In
35       Sun(.sun)            Direct-24    Yes      No         In
36       SGI(.sgi,.rgb)       Direct-24    Yes     Yes         In
37       XWD(.xwd)            Indexed-8    Yes     Yes        None
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39       ──────────────────────────────────────────────────────────────
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CAVEATS

43       Not all formats and encodings that are supported for  output  are  sup‐
44       ported  for  input;  the software has separate input and output drivers
45       for format/encoding pair.
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47       For all the formats listed below, only  8-bit  pixels  and  8-bit  run-
48       lengths (where applicable) are supported.
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50       Experience  with HDF's "advanced" compression option indicates that you
51       should use it only if you consider random pixels an  advanced-appearing
52       image.
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SEE ALSO

56       rasview(1NCARG),   rasls(1NCARG),   rascat(1NCARG),  rasgetpal(1NCARG),
57       rassplit(1NCARG)
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59       Hardcopy: NCAR Graphics Fundamentals, UNIX Version
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62       Copyright (C) 1987-2009
63       University Corporation for Atmospheric Research
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65       The use of this Software is governed by a License Agreement.
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69NCAR                             February 1993              RAS_FORMATS(1NCAR)
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