NAME
r.composite - Converts three
user-specified raster map layers into a composite RGB
layer.
(GRASS Raster Program)
SYNOPSIS
r.composite
r.composite help
r.composite [-o] [-d] [-c]
r_map=name
g_map=name
b_map=name
[levels=value]
[lev_r=value]
[lev_g=value]
[lev_b=value]
output=name
DESCRIPTION
This program combines three raster map layers to form a
composite RGB layer. For each layer, the corresponding
component from the layer's color table is used (e.g. for
the red layer, the red component is used, and so on). In
general, the layers should use a gray-scale color table.
OPTIONS
Flags:
- -o
- Overwrite output maps.
- -d
- Dither.
- -c
- Use closest color.
Parameters:
- r_map=name
- Name of raster map layer to be used for RED component.
- g_map=name
- Name of raster map layer to be used for GREEN component.
- b_map=name
- Name of raster map layer to be used for BLUE component.
- levels=value
- Number of levels to use for each component (default
32), except where overridden by the appropriate
lev_[rgb] parameter.
- lev_r=value
- Number of levels to use for the RED component (overrides the
levels parameter).
- lev_g=value
- Number of levels to use for the GREEN component (overrides the
levels parameter).
- lev_b=value
- Number of levels to use for the BLUE component (overrides the
levels parameter).
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.
SEE ALSO
d.rast
d.rgb
r.colors
i.composite
AUTHOR
Glynn Clements
Last changed: $Date$