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r.blend(1grass) GRASS User's Manual r.blend(1grass)

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] [nprocs=integer] [--overwrite] [--help] [--verbose] [--quiet] [--ui]

Flags:


Combine resulting R,G,B layers into single output map

Allow output files to overwrite existing files

Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog

Parameters:


Name of first raster map for blending

Name of second raster map for blending

Basename for red, green and blue output raster maps

Percentage weight of first map for color blending
Options: 0-100
Default: 50

Number of threads for parallel computing
0: use OpenMP default; >0: use nprocs; <0: use MAX-nprocs
Default: 0

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)

Latest change: Thursday Nov 06 23:50:00 2025 in commit: f714bf80e54f853796854f03b5c86fd7f5b1cd9d

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© 2003-2026 GRASS Development Team, GRASS 8.5.0RC1 Reference Manual

GRASS 8.5.0RC1