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pamtofits(1) |
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pnmtofits
Updated: 25 September 2005
Table Of Contents
NAME
pnmtofits - convert a PNM image into FITS format
SYNOPSIS
pnmtofits [-max f] [-min f] [pnmfile]
DESCRIPTION
This program is part of Netpbm.
pnmtofits reads a PNM image as
input and produces a FITS (Flexible Image
Transport System) file as output. The resolution of the
output file is
either 8 bits/pixel, or 16 bits/pixel, depending on the
value of maxval in
the input file. If the input file is a PBM or PGM image, the
output file
consists of a single plane image (NAXIS = 2). If instead the
input file is a
PPM image, the output file will consist of a three-plane
image (NAXIS = 3,
NAXIS3 = 3).
You can find a full description
of the FITS format in Astronomy &
Astrophysics Supplement Series 44 (1981), page 363.
OPTIONS
-min and -max tell pnmtofits
what "physical values" zero and maxval sample
values, respectively, in the input image represent. Physical
values are a
FITS concept. pnmtofits sets up the BSCALE and BZERO FITS
header cards to
indicate this information.
The default for -min is 0 and
for -max is the maxval, which means if you
don’t specify these options, the FITS physical values
are in fact the
original PNM sample values.
pnmtofits always sets up the
FITS header DATAMIN and DATAMAX cards to
indicate that the highest physical value in the image is the
one
corresponding to the PNM maxval and the lowest is that
corresponding to PNM
zero. This isn’t really how those cards are supposed
to be used, since the
input image doesn’t necessarily contain the full
possible range of sample
values. It is a conservative approximation.
HISTORY
pamtofits was originally
pnmtofits and did not handle PAM input. It was
extended and renamed in Netpbm 10.30 (October 2005).
SEE ALSO
fitstopnm, pnm
AUTHOR
Copyright (C) 1989 by Wilson H.
Bent (whb@hoh-2.att.com), with modifications
by Alberto Accomazzi (alberto@cfa.harvard.edu).
_________________________________________________________________
Table Of Contents
* NAME
* SYNOPSIS
* DESCRIPTION
* OPTIONS
* HISTORY
* SEE ALSO
* AUTHOR
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pamtofits(1) | |