GRASS logo

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)

Table of contents

DESCRIPTION

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.

NOTES

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.

SEE ALSO

i.rgb.his, r.colors

AUTHOR

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: Thu Feb 3 11:10:06 2022 in commit: 73413160a81ed43e7a5ca0dc16f0b56e450e9fef


Main index | Imagery index | Topics index | Keywords index | Graphical index | Full index

© 2003-2022 GRASS Development Team, GRASS GIS 8.0.3dev Reference Manual