NAME
i.his.rgb - Hue-intensity-saturation (his) to red-green-blue (rgb) raster map color transformation function.
KEYWORDS
imagery
SYNOPSIS
i.his.rgb
i.his.rgb help
i.his.rgb hue_input=string intensity_input=string saturation_input=string red_output=string green_output=string blue_output=string [--overwrite]
Flags:
- --overwrite
- Force overwrite of output files
Parameters:
- hue_input=string
- hue map name
- intensity_input=string
- intensity map name
- saturation_input=string
- saturation map name
- red_output=string
- output map representing the red
- green_output=string
- output map representing the green
- blue_output=string
- output map representing the 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
hsv.rgb.sh
i.colors
i.rgb.his
r.colors
rgb.hsv.sh
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: 2003/04/17 14:48:52 $
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