ras_formats(5) - Linux man page

Name

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

Synopsis

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

Description

NCAR Graphics and NCAR View applications are built upon a common library that provides read and write access to raster imagery. The table below summarizes the support that is provided for all the different formats. Note that a format may be writeable but not readable, and that a compressed image may be readable but not writeable. By default, a raster image is written as compressed if possible. For those applications that key upon the filename to determine the raster format, or allow a -ifmt or -ofmt, the extension, as listed below, should be used without the "." in front (e.g. use "hdf", not ".hdf").

Format(extensions)	Encoding	Input	Output	Compression

Abekas A60(.a60)	RGB24	Yes	Yes	None
AVS(.avs)	RGB24	Yes	Yes	None
HDF(.hdf)	Indexed-8	Yes	Yes	In/Out
HDF(.hdf)	Direct-24	Yes	Yes	In/Out
HPPCL(.hppcl)	Indexed-8	No	Yes	Out
NRIF(.nrif)	Bilevel	No	No	None
NRIF(.nrif)	Indexed-8	Yes	Yes	In/Out
NRIF(.nrif)	Direct-24	Yes	Yes	In/Out
Sun(.sun)	Indexed-8	Yes	Yes	In
Sun(.sun)	Direct-24	Yes	No	In
SGI(.sgi,.rgb)	Direct-24	Yes	Yes	In
XWD(.xwd)	Indexed-8	Yes	Yes	None

Caveats

Not all formats and encodings that are supported for output are supported for input; the software has separate input and output drivers for format/encoding pair.

For all the formats listed below, only 8-bit pixels and 8-bit run-lengths (where applicable) are supported.

Experience with HDF's "advanced" compression option indicates that you should use it only if you consider random pixels an advanced-appearing image.

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