hipstopgm(1) [osf1 man page]

hipstopgm(1)						      General Commands Manual						      hipstopgm(1)

NAME

       hipstopgm - convert a HIPS file into a portable graymap

SYNOPSIS

       hipstopgm [hipsfile]

DESCRIPTION

       Reads a HIPS file as input.  Produces a portable graymap as output.

       If the HIPS file contains more than one frame in sequence, hipstopgm will concatenate all the frames vertically.

       HIPS is a format developed at the Human Information Processing Laboratory, NYU.

SEE ALSO

       pgm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

								   24 August 89 						      hipstopgm(1)

pgmedge(1)                                                    General Commands Manual                                                   pgmedge(1)

NAME

       pgmedge - edge-detect a portable graymap

SYNOPSIS

       pgmedge [pgmfile]

DESCRIPTION

       Reads  a  portable  graymap  as  input.   Outlines  the edges, and writes a portable graymap as output.  Piping the result through pgmtopbm
       -threshold and playing with the threshold value will give a bitmap of the edges.

       The edge detection technique used is to take the Pythagorean sum of two Sobel gradient operators at 90 degrees to  each  other.   For  more
       details see "Digital Image Processing" by Gonzalez and Wintz, chapter 7.

       The  maxval  of the output is the same as the maxval of the input The effect is better with larger maxvals, so you may want to increase the
       maxval of the input by running it through pnmdepth first.

SEE ALSO

       pgmenhance(1), pgmtopbm(1), pnmdepth(1), pgm(5), pbm(5)

AUTHOR

       Copyright (C) 1991 by Jef Poskanzer.

                                                                 04 February 1990                                                       pgmedge(1)