---
name: "r.rgb"
section: "1grass"
platform: "linux"
package: "grass-doc"
version: "8.4.1-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/r.rgb"
---

# r.rgb(1grass)

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

## 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 Feb 24 17:51:45 2025

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