NAME
r.composite - Combines red, green and blue map layers into a single composite map layer.
KEYWORDS
raster
SYNOPSIS
r.composite
r.composite help
r.composite [-dc] red=string green=string blue=string [levels=integer] [lev_red=integer] [lev_green=integer] [lev_blue=integer] output=string [--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=string
- Name of raster map layer to be used for <red>
- green=string
- Name of raster map layer to be used for <green>
- blue=string
- Name of raster map layer to be used for <blue>
- 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 <red>
- Options: 1-256
- lev_green=integer
- Number of levels to be used for <green>
- Options: 1-256
- lev_blue=integer
- Number of levels to be used for <blue>
- Options: 1-256
- output=string
- Name of raster map to contain results
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 11:04:18 -0800 (Tue, 26 Feb 2008) $
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