---
name: "pnminvert"
section: "1"
platform: "linux"
package: "netpbm"
version: "10.86.51-2"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/pnminvert"
---

# pnminvert(1)

invert a PNM image

## NAME

pnminvert - invert a PNM image

## SYNOPSIS

**pnminvert**

\[*pnmfile*\]

## DESCRIPTION

This program is part of **Netpbm**(1) .

**pnminvert** reads a PNM image as input, inverts it black for white, and produces a PNM image as output.

If the image is grayscale, **pnminvert** replaces a pixel with one of complementary brightness, i.e. if the original pixel has gamma-adjusted gray value G, the output pixel has gray value maxval - G.

If the image is color, **pnminvert** inverts each individual RGB component the same as for a grayscale image.

## OPTIONS

There are no command line options defined specifically for **pnminvert**, but it recognizes the options common to all programs based on libnetpbm (See \
  Common Options ⟨index.html#commonoptions⟩ .)

## SEE ALSO

**pnm**(1)

## AUTHOR

Copyright (C) 1989 by Jef Poskanzer.

## DOCUMENT SOURCE

This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The master documentation is at

-

  **http://netpbm.sourceforge.net/doc/pnminvert.html**