# man > ppmtopgm(1)

> **TLDR:** Convert a PPM image to a PGM image.
>
- Convert PPM image to PGM image:
  `ppmtopgm {{path/to/file.ppm}} > {{path/to/file.pgm}}`
- Display version:
  `ppmtopgm {{-v|-version}}`

*Source: tldr-pages*

---

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



## NAME
       ppmtopgm - convert a portable pixmap into a portable graymap

## SYNOPSIS
       **ppmtopgm** [_ppmfile_]

## DESCRIPTION
       Reads  a  portable  pixmap as input.  Produces a portable graymap as output.  The output is a
       "black and white" rendering of the original image, as in a black and white  photograph.   The
       quantization formula used is .299 r + .587 g + .114 b.

       Note  that  although  there is a **pgmtoppm** program, it is not necessary for simple conversions
       from pgm to ppm , because any ppm program can read pgm (and pbm ) files automatically.   **pgm**‐‐
       **toppm**  is  for  colorizing a pgm file.  Also, see **ppmtorgb3** for a different way of converting
       color to gray.  And **ppmdist** generates a grayscale image from a color image, but in a way that
       makes  it  easy to differentiate the original colors, not necessarily a way that looks like a
       black and white photograph.


## QUOTE
       Cold-hearted orb that rules the night
       Removes the colors from our sight
       Red is gray, and yellow white
       But we decide which is right
       And which is a quantization error.

## SEE ALSO
       [**pgmtoppm**(1)](https://www.chedong.com/phpMan.php/man/pgmtoppm/1/markdown),[**ppmtorgb3**(1)](https://www.chedong.com/phpMan.php/man/ppmtorgb3/1/markdown),[**rgb3toppm**(1)](https://www.chedong.com/phpMan.php/man/rgb3toppm/1/markdown),[**ppmdist**(1)](https://www.chedong.com/phpMan.php/man/ppmdist/1/markdown),[**ppm**(5)](https://www.chedong.com/phpMan.php/man/ppm/5/markdown),[**pgm**(5)](https://www.chedong.com/phpMan.php/man/pgm/5/markdown)

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



                                            10 April 2000                                [ppmtopgm(1)](https://www.chedong.com/phpMan.php/man/ppmtopgm/1/markdown)