r.rgb - GRASS manual
Author: GRASS Development Team
Description: r.rgb: Splits a raster map into red, green and blue maps.
Keywords: raster, RGB, separate, split

## NAME

r.rgb - Splits a raster map into red, green and blue maps.

## KEYWORDS

raster, RGB, separate, split

## SYNOPSIS

r.rgb
r.rgb --help
r.rgb input=name [red=name] [green=name] [blue=name] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

### Flags:

--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
red=name
  Red channel raster map name
green=name
  Green channel raster map name
blue=name
  Blue channel raster map name

## DESCRIPTION

r.rgb generates separate red, green and blue maps from a raster map and its associated color table (grey255).

## EXAMPLE

    g.region raster=elevation -p
    r.rgb input=elevation red=elevation.r green=elevation.g blue=elevation.b

In this case r.rgb produces in the current mapset three new raster maps - 'elevation.r', 'elevation.g', 'elevation.b'.

## SEE ALSO

r.composite, r.blend, r.colors, r.mapcalc

## AUTHOR

Glynn Clements

## SOURCE CODE

Available at: r.rgb source code (history)

Accessed: Monday May 11 17:55:44 2026

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