r.composite
r.composite - Combines red, green and blue raster maps into a single composite raster map.
Raster (r.*)
ParameterRaster|red|Red|False
ParameterRaster|green|Green|False
ParameterRaster|blue|Blue|False
ParameterNumber|levels|Number of levels to be used for each component|1.0|256.0|32
ParameterBoolean|-d|Dither|False
ParameterBoolean|-c|Use closest color|False
OutputRaster|output|Output RGB image