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 11:04:18 -0800 (Tue, 26 Feb 2008) $

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