---
name: "an-fitstopnm"
section: "1"
platform: "linux"
package: "astrometry.net"
version: "0.97+dfsg-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/an-fitstopnm"
---

# an-fitstopnm(1)

Convert FITS images into ugly PNM images.

## NAME

an-fitstopnm - Convert FITS images into ugly PNM images.

## SYNOPSIS

an-fitstopnm **-i** *input-file*

## OPTIONS

- **-o** *file*

  Output file (default stdout)

- **-e** *ext*

  FITS extension number (default 0)

- **-p** *plane*

  Image plane number (default 0)

- **-m** *margin*

  Number of pixels to avoid at the image edges (default 0)

- **-O**

  Do ordinal transform (default: map 25-95 percentile)

- **-L** *percentile*

  Set percentile that becomes black (default 25)

- **-H** *percentile*

  Set percentile that becomes white (default 95)

- **-I**

  Invert black-on-white image

- **-X** *max*

  Set the input value that will become white

- **-N** *min*

  Set the input value that will become black

- **-x**

  Set max to the observed maximum value

- **-n**

  Set min to the observed minimum value

- **-r**

  Same as **-x** **-n**: set min and max to observed data range.

- **-s**

  Write 16-bit output

- **-v**

  Verbose

- **-M**

  Compute & print median value

## AUTHOR

The Astrometry.net team. Principal investigators are David W. Hogg (NYU) and Dustin Lang (CMU).

## SEE ALSO

http://astrometry.net