rawtopgm(1)

NAME

       rawtopgm - convert raw grayscale bytes into a portable graymap

SYNOPSIS

       rawtopgm  [-headerskip  N] [-rowskip N] [-tb|-topbottom] [width height]
       [imagedata]

DESCRIPTION

       Reads raw grayscale bytes as input.  Produces  a  portable  graymap  as
       output.   The input file is just grayscale bytes.  If you don't specify
       the width and height on the command line, the program  will  check  the
       size  of  the  image  and try to make a quadratic image of it. It is an
       error to supply a non quadratic  image  without  specifying  width  and
       height.  The maxval is assumed to be 255.

OPTIONS

       -headerskip
              If the file has a header, you can use this flag to skip over it.

       -rowskip
              If there is padding at the ends of the rows,  you  can  skip  it
              with  this flag.  Note that rowskip can be a real number.  Amaz-
              ingly, I once had an image with 0.376 bytes of padding per  row.
              This  turned out to be due to a file-transfer problem, but I was
              still able to read the image.

       -tb -topbottom
              Flips the image upside down.  The first pixel in a pgm  file  is
              in  the  lower  left  corner  of the image.  For conversion from
              images with the first pixel in the upper left corner  (e.g.  the
              Molecular  Dynamics  and  Leica confocal formats) this flips the
              image right.  This is equivalent to rawtopgm  [file]  |  pnmflip
              -tb .

BUGS

       If  you  don't specify the image width and height, the program will try
       to read the entire image to a memory buffer. If you get a message  that
       states  that you are out of memory, try to specify the width and height
       on the command line. Also, the -tb option consumes much memory.

SEE ALSO

       pgm(5), rawtoppm(1), pnmflip(1)

AUTHORS

       Copyright (C) 1989 by Jef Poskanzer.
       Modified June 1993 by Oliver Trepte, oliver@fysik4.kth.se

                                 15 June 1993                      rawtopgm(1)