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

# r.blend(1grass)

Blends color components of two raster maps by a given ratio.

## NAME

**r.blend**  - Blends color components of two raster maps by a given ratio.

## 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 single output map

- **--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:

- **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.

## 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*

## SEE ALSO

*d.shade,* *g.region,* *r.shade,* *r.colors,* *r.his,* *r.mapcalc,* *r.rgb,* *r.support*

## AUTHORS

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

## SOURCE CODE

Available at: r.blend source code (history)

Accessed: Monday Feb 24 17:51:44 2025

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