# pgmenhance(1) - man - phpman

> **TLDR:** Edge-enhance a PGM image.
>
- Edge-enhance a PGM image:
  `pgmenhance {{path/to/image.pgm}} > {{path/to/output.pgm}}`
- Specify the level of enhancement:
  `pgmenhance -{{1..9}} {{path/to/image.pgm}} > {{path/to/output.pgm}}`

*Source: tldr-pages*

---

[pgmenhance(1)](https://www.chedong.com/phpMan.php/man/pgmenhance/1/markdown)                          General Commands Manual                         [pgmenhance(1)](https://www.chedong.com/phpMan.php/man/pgmenhance/1/markdown)



## NAME
       pgmenhance - edge-enhance a portable graymap

## SYNOPSIS
       **pgmenhance** [_-N_] [_pgmfile_]

## DESCRIPTION
       Reads a portable graymap as input.  Enhances the edges, and writes a portable graymap as out‐
       put.

       The edge enhancing technique is taken from Philip R. Thompson's "xim" program, which in  turn
       took  it from section 6 of "Digital Halftones by Dot Diffusion", D. E. Knuth, ACM Transaction
       on Graphics Vol. 6, No. 4, October 1987, which in turn got it from two 1976 papers by  J.  F.
       Jarvis et. al.

## OPTIONS
       The  optional _-N_ flag should be a digit from 1 to 9.  1 is the lowest level of enhancement, 9
       is the highest, The default is 9.

## SEE ALSO
       [pgmedge(1)](https://www.chedong.com/phpMan.php/man/pgmedge/1/markdown), [pgm(5)](https://www.chedong.com/phpMan.php/man/pgm/5/markdown), [pbm(5)](https://www.chedong.com/phpMan.php/man/pbm/5/markdown)

## AUTHOR
       Copyright (C) 1989 by Jef Poskanzer.



                                           13 January 1989                             [pgmenhance(1)](https://www.chedong.com/phpMan.php/man/pgmenhance/1/markdown)