r.blend(1)

📦
version 8.4.2 · 8 versions
, in fedora 44

💖 r.blend(1) — GRASS GIS User's Manual 💖

okay bestie, welcome to r.blend, a lil tool from the GRASS GIS fam that blends the color components of two raster maps together by a ratio you pick. it's giving mixing two paints but make it nerdy 💅

✨ NAME ✨

r.blend — blends color components of two raster maps by a given ratio. no cap, that's literally the whole job 🎀

🏷️ KEYWORDS 🏷️

  • raster
  • composite

📜 SYNOPSIS 📜

r.blend
r.blend --help
r.blend [-c] first=name second=name output=basename  [percent=float]
[--overwrite]  [--help]  [--verbose]  [--quiet]  [--ui]

🚩 Flags 🚩

  • -c — combine resulting R,G,B layers into a single output map ✨ (one map to rule them all, main character energy fr)
  • --overwrite — allow output files to overwrite existing files ⚠️ (bestie, this one does what it says on the tin — it will absolutely clobber what's already there, so vibe check your filenames first)
  • --help — print usage summary 🫶
  • --verbose — verbose module output (it'll yap, but in a helpful way)
  • --quiet — quiet module output 🤫
  • --ui — force launching GUI dialog 🖥️✨

🎀 Parameters 🎀

  • first=name [required] — name of first raster map for blending
  • second=name [required] — name of second raster map for blending
  • output=basename [required] — basename for red, green and blue output raster maps 🌈
  • percent=float — percentage weight of first map for color blending
    • Options: 0-100
    • Default: 50

🌸 DESCRIPTION 🌸

r.blend blends color components of 2 raster maps by a specified percentage of the first map. that's it, that's the tea 🍵 like, you say "gimme this much of map one" and it does the math and hands you the pretty colors back 💜

🌟 EXAMPLE 🌟

blending the aspect map with the elevation map for a shaded map (North Carolina sample dataset):

g.region raster=elevation
r.relief input=elevation output=relief zscale=10
r.blend -c first=elevation second=relief output=blend percent=75

Figure: Elevation blended with shaded relief 👑

look at that command block. three lines. ate. no crumbs left. 🔥

👀 SEE ALSO 👀

  • d.shade
  • g.region
  • r.shade
  • r.colors
  • r.his
  • r.mapcalc
  • r.rgb
  • r.support

go read those too bestie, they're all in the same friend group 💖

👑 AUTHORS 👑

  • Unknown: probably CERL
  • Updated to GRASS 5.7 by Michael Barton, Arizona State University

(we stan an anonymous legend and also stan Michael 🫶)

📦 SOURCE CODE 📦

Available at: r.blend 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 manual came at you straight from GRASS 8.4.2, saved on Saturday Jan 17 05:41:52 2026, and stamped with r.blend(1) down at the bottom. now go blend something iconic ✨💅🦋

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