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) $

       Full index

       © 2003-2013 GRASS Development Team

GRASS 6.4.3                                                                                    i.his.rgb(1grass)