r.composite(1grass) GRASS GIS User's Manual r.composite(1grass)
NAME
r.composite - Combines red, green and blue raster maps into a single
composite raster map.
KEYWORDS
raster, composite, RGB
SYNOPSIS
r.composite
r.composite --help
r.composite [-dc] red=name green=name blue=name [levels=integer]
[level_red=integer] [level_green=integer] [level_blue=integer]
output=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
-d
Dither
-c
Use closest color
--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:
red=name [required]
Name of raster map to be used for <red>
green=name [required]
Name of raster map to be used for <green>
blue=name [required]
Name of raster map to be used for <blue>
levels=integer
Number of levels to be used for each component
Options: 1-256
Default: 32
level_red=integer
Number of levels to be used for <red>
Options: 1-256
level_green=integer
Number of levels to be used for <green>
Options: 1-256
level_blue=integer
Number of levels to be used for <blue>
Options: 1-256
output=name [required]
Name for output raster map
DESCRIPTION
This program combines three raster maps to form a composite RGB map.
For each input map layer, the corresponding component from the map’s
color table is used (e.g. for the red map, the red component is used,
and so on). In general, the maps should use a grey-scale color table.
NOTES
The default number of intensity levels for each component is 32, re-
sulting in a total of 32768 possible colors (equivalent to 15 bits per
pixel). If significantly more levels than this are used, not only will
r.composite take longer to run, but displaying the resulting layer with
d.rast will also be significantly slower.
Floyd-Steinberg dithering is optionally used with the -d flag.
EXAMPLES
RGB composite of three satellite bands
Color composite of a LANDSAT scene (North Carolina sample dataset):
g.region raster=lsat7_2002_10
r.composite blue=lsat7_2002_10 green=lsat7_2002_20 red=lsat7_2002_30 \
output=lsat7_2002_rgb
RGB composite with dithering
Creating a composite RGB raster using 32 color levels per layer, with
dithering:
r.composite -d red=elevation.r green=elevation.g blue=elevation.b \
output=elev.composite
SEE ALSO
d.rast, d.rgb, r.blend, r.colors, r.rgb
Wikipedia Entry: Floyd-Steinberg dithering
AUTHOR
Glynn Clements
SOURCE CODE
Available at: r.composite source code (history)
Accessed: unknown
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GRASS 7.8.7 r.composite(1grass)
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