r.out.ppm3 - GRASS manual
Author: GRASS Development Team
Description: r.out.ppm3: Converts 3 GRASS raster layers (R,G,B) to a PPM image file.
Keywords: raster, export, output

## NAME

r.out.ppm3 - Converts 3 GRASS raster layers (R,G,B) to a PPM image file.

## KEYWORDS

raster, export, output

## SYNOPSIS

r.out.ppm3
r.out.ppm3 --help
r.out.ppm3 [-c] red=string green=string blue=string output=string [--help] [--verbose] [--quiet] [--ui]

### Flags:

-c
  Add comments to describe the region
--help
  Print usage summary
--verbose
  Verbose module output
--quiet
  Quiet module output
--ui
  Force launching GUI dialog

### Parameters:

red=string [required]
  Name of raster map to be used for <red>
green=string [required]
  Name of raster map to be used for <green>
blue=string [required]
  Name of raster map to be used for <blue>
output=string [required]
  Name for new PPM file. (use '-' for stdout)

## DESCRIPTION

r.out.ppm3 converts 3 GRASS raster layers (R,G,B) to a PPM image file, using the current region.

This program converts a GRASS raster map to a PPM image file using the current region settings.

To get the full area and resolution of the raster map, run:

    g.region raster=[mapname]

before running r.out.ppm3.

## NOTES

One pixel is written for each cell value, so if ew_res and ns_res differ, the aspect ratio of the resulting image will be off.

## SEE ALSO

r.out.ppm, r.in.gdal, d.rgb

## AUTHOR

Glynn Clements
Based upon r.out.ppm and d.rgb.

## SOURCE CODE

Available at: r.out.ppm3 source code (history)

Latest change: Thursday May 08 20:58:05 2025 in commit: 4144ba81fa125e1549fc52e1cf5feb4fa004be8b

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© 2003-2026 GRASS Development Team, GRASS 8.5.1dev Reference Manual