NAME¶
r.composite - Combines red, green and blue raster maps into a
single composite raster map.
KEYWORDS¶
raster, composite
SYNOPSIS¶
r.composite
r.composite help
r.composite [-
dc]
red=
name green=
name
blue=
name [
levels=
integer]
[
lev_red=
integer] [
lev_green=
integer]
[
lev_blue=
integer]
output=
name
[--
overwrite] [--
verbose] [--
quiet]
Flags:¶
- -d
-
Dither
- -c
-
Use closest color
- --overwrite
-
Allow output files to overwrite existing files
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
Parameters:¶
- red=name
-
Name of raster map to be used for
- green=name
-
Name of raster map to be used for
- blue=name
-
Name of raster map to be used for
- levels=integer
-
Number of levels to be used for each component
Options: 1-256
Default: 32
- lev_red=integer
-
Number of levels to be used for
Options: 1-256
- lev_green=integer
-
Number of levels to be used for
Options: 1-256
- lev_blue=integer
-
Number of levels to be used for
Options: 1-256
- output=name
-
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 gray-scale color table.
NOTES¶
The default number of intensity levels for each component is 32, resulting 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.
EXAMPLE¶
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
Wikipedia Entry: Floyd-Steinberg dithering
AUTHOR¶
Glynn Clements
Last changed: $Date: 2008-02-26 20:04:18 +0100 (Tue, 26 Feb 2008) $
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