1i.his.rgb(1)                  Grass User's Manual                 i.his.rgb(1)
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NAME

6       i.his.rgb   -  Hue-intensity-saturation  (his)  to red-green-blue (rgb)
7       raster map color transformation function.
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KEYWORDS

10       imagery
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SYNOPSIS

13       i.his.rgb
14       i.his.rgb help
15       i.his.rgb  hue_input=name  intensity_input=name   saturation_input=name
16       red_output=name   green_output=name   blue_output=name    [--overwrite]
17       [--verbose]  [--quiet]
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19   Flags:
20       --overwrite
21           Allow output files to overwrite existing files
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23       --verbose
24           Verbose module output
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26       --quiet
27           Quiet module output
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29   Parameters:
30       hue_input=name
31           Hue map name
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33       intensity_input=name
34           Intensity map name
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36       saturation_input=name
37           Saturation map name
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39       red_output=name
40           Output map representing the red
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42       green_output=name
43           Output map representing the green
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45       blue_output=name
46           Output map representing the blue
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DESCRIPTION

49       i.his.rgb is an image processing program  that  processes  three  input
50       raster  map layers as hue, intensity and saturation components and pro‐
51       duces three output raster map layers representing the  red,  green  and
52       blue components of this data.  The output raster map layers are created
53       by a standard hue-intensity-saturation (his)  to  red-green-blue  (rgb)
54       color  transformation.   Each output raster map layer is given a linear
55       gray scale color table.  The current geographic region  and  mask  set‐
56       tings are respected.
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NOTES

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

68       hsv.rgb.sh
69       i.colors
70       i.rgb.his
71       r.colors
72       rgb.hsv.sh
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AUTHOR

75       David Satnik, GIS Laboratory, Central Washington University
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77       with  acknowledgements  to Ali Vali, Univ. of Texas Space Research Cen‐
78       ter, for the core routine.
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80       Last changed: $Date: 2003-04-17 16:51:33 +0200 (Thu, 17 Apr 2003) $
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82       Full index
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84       © 2003-2008 GRASS Development Team
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88GRASS 6.3.0                                                       i.his.rgb(1)
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