GRASS logo

NAME

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

KEYWORDS

raster, composite

SYNOPSIS

r.blend.py
r.blend.py --help
r.blend.py [-c] first=name second=name output=basename [percent=float] [nprocs=integer] [--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
nprocs=integer
Number of threads for parallel computing
0: use OpenMP default; >0: use nprocs; <0: use MAX-nprocs
Default: 0

Table of contents

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
r.blend example
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

Main index | Raster index | Topics index | Keywords index | Graphical index | Full index

© 2003-2025 GRASS Development Team, GRASS 8.5.0dev Reference Manual