.TH r.blend 1grass "" "GRASS 7.8.5" "GRASS GIS User's Manual"
.SH NAME
\fI\fBr.blend\fR\fR  \- Blends color components of two raster maps by a given ratio.
.SH KEYWORDS
raster, composite
.SH SYNOPSIS
\fBr.blend\fR
.br
\fBr.blend \-\-help\fR
.br
\fBr.blend\fR [\-\fBc\fR] \fBfirst\fR=\fIname\fR \fBsecond\fR=\fIname\fR \fBoutput\fR=\fIbasename\fR  [\fBpercent\fR=\fIfloat\fR]   [\-\-\fBoverwrite\fR]  [\-\-\fBhelp\fR]  [\-\-\fBverbose\fR]  [\-\-\fBquiet\fR]  [\-\-\fBui\fR]
.SS Flags:
.IP "\fB\-c\fR" 4m
.br
Combine resulting R,G,B layers into single output map
.IP "\fB\-\-overwrite\fR" 4m
.br
Allow output files to overwrite existing files
.IP "\fB\-\-help\fR" 4m
.br
Print usage summary
.IP "\fB\-\-verbose\fR" 4m
.br
Verbose module output
.IP "\fB\-\-quiet\fR" 4m
.br
Quiet module output
.IP "\fB\-\-ui\fR" 4m
.br
Force launching GUI dialog
.SS Parameters:
.IP "\fBfirst\fR=\fIname\fR \fB[required]\fR" 4m
.br
Name of first raster map for blending
.IP "\fBsecond\fR=\fIname\fR \fB[required]\fR" 4m
.br
Name of second raster map for blending
.IP "\fBoutput\fR=\fIbasename\fR \fB[required]\fR" 4m
.br
Basename for red, green and blue output raster maps
.IP "\fBpercent\fR=\fIfloat\fR" 4m
.br
Percentage weight of first map for color blending
.br
Options: \fI0\-100\fR
.br
Default: \fI50\fR
.SH DESCRIPTION
\fIr.blend\fR blends color components of 2 raster maps by a
specificed percentage of the first map.
.SH EXAMPLE
Blending the aspect map with the elevation map for a shaded map
(North Carolina sample dataset):
.br
.nf
\fC
g.region raster=aspect \-p
r.blend first=aspect second=elevation output=elev_shade_blend
d.mon wx0
d.rgb blue=elev_shade_blend.b green=elev_shade_blend.g red=elev_shade_blend.r
\fR
.fi
.SH SEE ALSO
\fI
d.shade,
g.region,
r.shade,
r.colors,
r.his,
r.mapcalc,
r.rgb,
r.support
\fR
.SH AUTHOR
Unknown: probably CERL
.br
Updated to GRASS 5.7 by Michael Barton, Arizona State University
.SH SOURCE CODE
.PP
Available at: r.blend source code (history)
.PP
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.PP
© 2003\-2020
GRASS Development Team,
GRASS GIS 7.8.5 Reference Manual