r.out.png(1)

NAME
r.out.png - Export a GRASS raster map as a non-georeferenced PNG image.

KEYWORDS
raster, export, output, PNG

SYNOPSIS
r.out.png
r.out.png --help
r.out.png [-tw] input=name output=name [compression=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

  Flags:

-t
    Make NULL cells transparent

-w
    Output world file

--overwrite
    Allow output files to overwrite existing files

--help
    Print usage summary

--verbose
    Verbose module output

--quiet
    Quiet module output

--ui
    Force launching GUI dialog

  Parameters:

input=name [required]
    Name of input raster map

output=name [required]
    Name for new PNG file (use ’-’ for stdout)

compression=integer
    Compression level of PNG file
    (0 = none, 1 = fastest, 9 = best)
    Options: 0-9
    Default: 6

DESCRIPTION
r.out.png exports a GRASS raster map in non-georeferenced Portable Network Graphics (PNG) image format, respecting the current region resolution and bounds.

Optionally the user can choose to export a World File (.wld) to provide basic georeferencing support. When used with the transparency flag this can create images useful for KML, TMS, or WMS overlays. (e.g. for use in Google Earth or as OpenLayers tiles) If output is redirected to stdout, the world file will be called png_map.wld.

EXAMPLE
The example is based on the North Carolina sample data.

Export of the soil map to PNG format with world file:

g.region raster=soils_Kfactor -p
# export PNG file with additional world file
r.out.png input=soils_Kfactor output=soils_Kfactor -w
# verify
gdalinfo soils_Kfactor.png

SEE ALSO
r.out.gdal, r.out.ppm, r.out.ascii, r.import

AUTHORS
Alex Shevlakov
Hamish Bowman

SOURCE CODE

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

Accessed: Saturday May 09 12:58:35 2026

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