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=string      intensity_input=string      satura‐
16       tion_input=string   red_output=string   green_output=string   blue_out‐
17       put=string  [--overwrite]
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19   Flags:
20       --overwrite
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22   Parameters:
23       hue_input=string
24           hue map name
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26       intensity_input=string
27           intensity map name
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29       saturation_input=string
30           saturation map name
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32       red_output=string
33           output map representing the red
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35       green_output=string
36           output map representing the green
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38       blue_output=string
39           output map representing the blue
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DESCRIPTION

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

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

61       hsv.rgb.sh
62       i.colors
63       i.rgb.his
64       r.colors
65       rgb.hsv.sh
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AUTHOR

68       David Satnik, GIS Laboratory, Central Washington University
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70       with  acknowledgements  to Ali Vali, Univ. of Texas Space Research Cen‐
71       ter, for the core routine.
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73       Last changed: $Date: 2003/04/17 14:48:52 $
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75       Full index
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79GRASS 6.2.2                                                       i.his.rgb(1)
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