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
SYNOPSIS¶
i.his.rgb
i.his.rgb help
i.his.rgb hue_input=
name intensity_input=
name
saturation_input=
name red_output=
name
green_output=
name blue_output=
name
[--
overwrite] [--
verbose] [--
quiet]
Flags:¶
- --overwrite
-
Allow output files to overwrite existing files
- --verbose
-
Verbose module output
- --quiet
-
Quiet module output
Parameters:¶
- hue_input=name
-
Name of input raster map (hue)
- intensity_input=name
-
Name of input raster map (intensity)
- saturation_input=name
-
Name of input raster map (saturation)
- red_output=name
-
Name for output raster map (red)
- green_output=name
-
Name for output raster map (green)
- blue_output=name
-
Name for output raster map (blue)
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¶
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.
Last changed: $Date: 2011-11-08 10:42:51 +0100 (Tue, 08 Nov 2011) $
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