NAME

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

KEYWORDS

       imagery, color transformation, RGB, HIS

SYNOPSIS

       i.his.rgb
       i.his.rgb help
       i.his.rgb  hue_input=name   intensity_input=name   saturation_input=name   red_output=name
       green_output=name blue_output=name  [--overwrite]  [--verbose]  [--quiet]

   Flags:
       --overwrite
           Allow output files to overwrite existing files

       --verbose
           Verbose module output

       --quiet
           Quiet module output

   Parameters:
       hue_input=name
           Name of input raster map (hue)

       intensity_input=name
           Name of input raster map (intensity)

       saturation_input=name
           Name of input raster map (saturation)

       red_output=name
           Name for output raster map (red)

       green_output=name
           Name for output raster map (green)

       blue_output=name
           Name for output raster map (blue)

DESCRIPTION

       i.his.rgb  is  an image processing program that processes three input raster map layers as
       hue, intensity and saturation components and  produces  three  output  raster  map  layers
       representing  the  red,  green  and  blue  components of this data.  The output raster map
       layers are created by a standard hue-intensity-saturation (his)  to  red-green-blue  (rgb)
       color  transformation.   Each  output  raster map layer is given a linear gray scale color
       table.  The current geographic region and mask settings are respected.

NOTES

       It is not possible to process three bands with i.his.rgb  and  then  exactly  recover  the
       original  bands  with  i.rgb.his.   This  is  due  to loss of precision because of integer
       computations and rounding.  Tests have shown that more  than  70%  of  the  original  cell
       values  will  be  reproduced  exactly after transformation in both directions and that 99%
       will be within plus or minus 1.  A few cell values may  differ  significantly  from  their
       original values.

SEE ALSO

       r.colors

AUTHOR

       David Satnik, GIS Laboratory, Central Washington University

       with  acknowledgements  to  Ali  Vali,  Univ. of Texas Space Research Center, for the core
       routine.

       Last changed: $Date: 2011-11-08 01:42:51 -0800 (Tue, 08 Nov 2011) $

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       © 2003-2013 GRASS Development Team