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NAME

       vtopgm - convert image from Vista data file to portable graymap

SYNOPSIS

       vtopgm [-option ...] [infile] [outfile]

DESCRIPTION

       vtopgm  converts  one  band  of an image to a portable graymap (PGM) file. A wide range of
       filters are available to convert PGM files to other formats.

       This program only produces portable graymaps whose pixel values are in the range 0 to 255.
       Any type of Vista image is accepted, but the image is first converted to have ubyte pixels
       if necessary. This conversion is performed by VConvertImageRange(3Vi).

COMMAND LINE OPTIONS

       vtopgm accepts the following options:

       -help          Prints a message describing options.

       -in infile     Specifies a Vista data file containing the image to be  converted.  If  the
                      file contains more than one image, only the first is used.

       -out outfile   Specifies the file to contain the portable graymap.

       -band band     Specifies the image band to be converted. Default: 0.

       Input  and  output files can be specified on the command line or allowed to default to the
       standard input and output streams.

SEE ALSO

       pgm(5), VImage(3Vi), Vista(7Vi)

AUTHOR

       David Lowe <lowe@cs.ubc.ca>