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This is the command i.his.rgbgrass that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator



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


imagery, color transformation, RGB, HIS, IHS


i.his.rgb --help
i.his.rgb hue=name intensity=name saturation=name red=name green=name blue=name
[--overwrite] [--help] [--verbose] [--quiet] [--ui]

Allow output files to overwrite existing files

Print usage summary

Verbose module output

Quiet module output

Force launching GUI dialog

hue=name [required]
Name of input raster map (hue)

intensity=name [required]
Name of input raster map (intensity)

saturation=name [required]
Name of input raster map (saturation)

red=name [required]
Name for output raster map (red)

green=name [required]
Name for output raster map (green)

blue=name [required]
Name for output raster map (blue)


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.


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.

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