Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
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,
IHS
SYNOPSIS
i.his.rgb
i.his.rgb --help
i.his.rgb hue=name intensity=name saturation=name red=name green=name blue=name [--overwrite] [--help] [--verbose] [--quiet] [--ui]
Flags:
- --overwrite
- Allow output files to overwrite existing files
- --help
- Print usage summary
- --verbose
- Verbose module output
- --quiet
- Quiet module output
- --ui
- Force launching GUI dialog
Parameters:
- 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.
i.rgb.his,
r.colors
David Satnik, GIS Laboratory,
Central Washington University
with acknowledgements to Ali Vali, Univ. of Texas Space Research
Center, for the core routine.
SOURCE CODE
Available at:
i.his.rgb source code
(history)
Latest change: Mon Nov 18 20:15:32 2019 in commit: 1a1d107e4f6e1b846f9841c2c6fabf015c5f720d
Note: This document is for an older version of GRASS GIS that will be discontinued soon. You should upgrade, and read the current manual page.
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GRASS Development Team,
GRASS GIS 7.8.8dev Reference Manual