1i.his.rgb(1) Grass User's Manual i.his.rgb(1)
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6 i.his.rgb - Transforms raster maps from HIS (Hue-Intensity-Saturation)
7 color space to RGB (Red-Green-Blue) color space.
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10 imagery, color transformation, RGB, HIS, IHS
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13 i.his.rgb
14 i.his.rgb --help
15 i.his.rgb hue=name intensity=name saturation=name red=name green=name
16 blue=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]
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18 Flags:
19 --overwrite
20 Allow output files to overwrite existing files
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22 --help
23 Print usage summary
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25 --verbose
26 Verbose module output
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28 --quiet
29 Quiet module output
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31 --ui
32 Force launching GUI dialog
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34 Parameters:
35 hue=name [required]
36 Name of input raster map (hue)
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38 intensity=name [required]
39 Name of input raster map (intensity)
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41 saturation=name [required]
42 Name of input raster map (saturation)
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44 red=name [required]
45 Name for output raster map (red)
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47 green=name [required]
48 Name for output raster map (green)
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50 blue=name [required]
51 Name for output raster map (blue)
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54 i.his.rgb is an image processing program that processes three input
55 raster map layers as hue, intensity and saturation components and pro‐
56 duces three output raster map layers representing the red, green and
57 blue components of this data. The output raster map layers are created
58 by a standard hue-intensity-saturation (HIS) to red-green-blue (RGB)
59 color transformation. Each output raster map layer is given a linear
60 gray scale color table. The current geographic region and mask set‐
61 tings are respected.
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64 It is not possible to process three bands with i.his.rgb and then
65 exactly recover the original bands with i.rgb.his. This is due to loss
66 of precision because of integer computations and rounding. Tests have
67 shown that more than 70% of the original cell values will be reproduced
68 exactly after transformation in both directions and that 99% will be
69 within plus or minus 1. A few cell values may differ significantly
70 from their original values.
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73 i.rgb.his, r.colors
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76 David Satnik, GIS Laboratory, Central Washington University
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78 with acknowledgements to Ali Vali, Univ. of Texas Space Research Cen‐
79 ter, for the core routine.
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81 Last changed: $Date: 2016-01-28 12:21:34 +0100 (Thu, 28 Jan 2016) $
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84 Available at: i.his.rgb source code (history)
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89 © 2003-2019 GRASS Development Team, GRASS GIS 7.4.4 Reference Manual
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93GRASS 7.4.4 i.his.rgb(1)