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Fitstopnm User Manual(0)                              Fitstopnm User Manual(0)

NAME
       fitstopnm - convert a FITS file into a PNM image

SYNOPSIS
       fitstopnm  [-image=N]  [-scanmax] [-printmax] [-min=f] [-max=f] [-omax-
       val=N [FITSfile]

       Minimum unique abbreviation of option is acceptable.  You may use  dou-
       ble  hyphens  instead  of single hyphen to denote options.  You may use
       white space in place of the equals sign to separate an option name from
       its value.

DESCRIPTION
       This program is part of Netpbm(1)

       fitstopnm  reads a FITS (Flexible Image Transport System) file as input
       and produces a PPM image if the FITS file consists of  3  image  planes
       (NAXIS = 3 and NAXIS3 = 3), or a PGM image if the FITS file consists of
       2 image planes (NAXIS = 2), or if you specify the -image option.

       The program tells you what kind of PNM image it is writing.

OPTIONS
       -image=N
              This is for FITS files with three axes.  The assumption is  that
              the  third axis is for multiple images, and this option lets you
              select which one you want.  -omaxval=N

              This is the maxval that the output PNM image is to have.

              By default, the maxval is the least possible to retain  all  the
              precision  of the FITS input.  That means the difference between
              the highest and lowest sample value in the input.  If the values
              range  from  -5 to 100, for example, the default maxval would be
              106 and each PNM sample value would correspond to one FITS  sam-
              ple value.

              For  a  FITS input with floating point sample values, the preci-
              sion is essentially unlimited, so this is not possible.  In that
              case, the default maxval is simply 255.

              This  option  was new in Netpbm 10.39 (June 2007).  Before that,
              the output maxval is always the default.

       -min=float

       -max=float

              You can use these options to override the min and max values  as
              read from the FITS header or the image data if the header has no
              DATAMIN and DATAMAX keywords.

       -scanmax
              Use this option to force the program to scan the data even  when
              the header has DATAMIN and DATAMAX.

       -printmax
              With this option, the program just prints the min and max values
              and quits without doing its normal job.

              This is for use in shell programs.  Example:

                  eval 'fitstopnm -printmax $filename |     awk {min = $1; max = $2}           END {print "min=" min; " max=" max}'

NOTES
   Pixel Order
       You may need to pass the output of fitstopnm through  pamflip  -topbot-
       tom.  See pamtofits

SEE ALSO
       pamtofits(1) , pamflip(1) , pgm(5)

       FITS(1)

AUTHOR
       Copyright  (C)  1989  by  Jef  Poskanzer,  with modifications by Daniel
       Briggs  (dbriggs@nrao.edu)  and  Alberto  Accomazzi   (alberto@cfa.har-
       vard.edu).

netpbm documentation              22 May 2007         Fitstopnm User Manual(0)
 

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