r.colors.stddev(1)

📦
version 8.4.2 · 8 versions
, in fedora 44

✨ r.colors.stddev ✨

okay bestie, welcome to the GRASS GIS User's Manual page for r.colors.stddev — she's a little raster color-table queen and she's about to eat 💅

🌸 NAME 🌸

r.colors.stddev — sets color rules based on stddev from a raster map's mean value.

no cap, that's literally her whole job 🫶

🎀 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 (the banded era, we love to see it)
  • -z — force center at zero (main character energy for difference maps)
  • --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. yes bestie, it's required, you can't skip her 🙈

💖 DESCRIPTION 💖

r.colors.stddev sets raster map color rules based on standard deviations from a map's mean value. and the way she does it? two vibes: either as a continuous color gradient, or in color bands per standard deviation (S.D.) from the mean. pick your fighter ⭐

With the color band option, the tea is:

  • values less than 1 S.D. from the mean get colored green 💚
  • values within 1–2 S.D. get colored yellow 💛
  • values within 2–3 S.D. get colored red ❤️
  • and beyond 3 S.D.? black. she said out of my sight 🖤

For a differences map there's an option to lock the center of the color table at zero. the lore:

  • 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 similarly transition to full red at +2 S.D. 🔥

🌈 EXAMPLE 🌈

North Carolina sample dataset, iconic behavior:

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: Saturday Jan 17 05:41:52 2026

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© 2003-2025 GRASS Development Team, GRASS GIS 8.4.2 Reference Manual

and that's the whole page, bestie 💖 this was GRASS 8.4.2, r.colors.stddev(1), last touched Saturday Jan 17 05:41:52 2026 — go color something pretty, periodt ✨🎀

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