hipstopgm(1) General Commands Manual hipstopgm(1)NAME
hipstopgm - convert a HIPS file into a portable graymap
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)
Check Out this Related Man Page
pgmedge(1) General Commands Manual pgmedge(1)NAME
pgmedge - edge-detect a portable graymap
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)
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