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

# r.colors.stddev(1grass)

Sets color rules based on stddev from a raster map’s mean value.

## NAME

**r.colors.stddev**  - Sets color rules based on stddev from a raster map’s mean value.

## KEYWORDS

raster, color table

## SYNOPSIS

**r.colors.stddev**\
 **r.colors.stddev --help**\
 **r.colors.stddev** \[-**bz**\] **map**=*name*  \[--**help**\]  \[--**verbose**\]  \[--**quiet**\]  \[--**ui**\]

### Flags:

- **-b**

  Color using standard deviation bands

- **-z**

  Force center at zero

- **--help**

  Print usage summary

- **--verbose**

  Verbose module output

- **--quiet**

  Quiet module output

- **--ui**

  Force launching GUI dialog

### Parameters:

- **map**=*name* **\[required\]**

  Name of raster map

## DESCRIPTION

*r.colors.stddev* set raster map color rules based on standard deviations from a map’s mean value, either as a continuous color gradient or in color bands per standard deviation (S.D.) from the mean.

With the color band option values less that 1 S.D. from the mean are colored green, within 1-2 S.D. are colored yellow, within 2-3 S.D. are colored red, and beyond 3 S.D. are colored black.

For a differences map there is an option to lock the center of the color table at zero. Values more than two S.D. below the mean will be colored blue; values below the mean but less than 2 S.D. away will transition to white, and above the mean the colors will simularly transition to full red at +2 S.D.

## EXAMPLE

North Carolina sample dataset:\

```
g.region raster=elevation -p
r.colors.stddev elevation
```

*Figure: Standard deviations from mean elevation*

## SEE ALSO

*r.colors,* *r.univar,* *v.colors*

## AUTHOR

Hamish Bowman, *Dunedin, New Zealand*

## SOURCE CODE

Available at: r.colors.stddev source code (history)

Accessed: Monday Feb 24 17:51:44 2025

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