Topic: color transformation

       i.his.rgb                                                    Transforms  raster  maps from HIS (Hue-Intensity-Saturation)
                                                                    color space to RGB (Red-Green-Blue) color space.

       i.rgb.his                                                    Transforms raster maps from RGB (Red-Green-Blue) color space
                                                                    to HIS (Hue-Intensity-Saturation) color space.

       r.his                                                        Generates  red,  green  and  blue  (RGB)  raster  map layers
                                                                    combining hue, intensity and saturation  (HIS)  values  from
                                                                    user-specified input raster map layers.

       See also the corresponding keyword color transformation for additional references.

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       © 2003-2019 GRASS Development Team, GRASS GIS 7.8.2 Reference Manual