NAME
r.colors.contrastbrightness - Change the contrast/brightness of a raster.
KEYWORDS
raster,
imagery,
contrast,
brightness
SYNOPSIS
r.colors.contrastbrightness
r.colors.contrastbrightness --help
r.colors.contrastbrightness input=name output=name minimum=value maximum=value contrast=value brightness=value [--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:
- input=name [required]
- Raster map to change the contrast of.
- output=name [required]
- Name for output raster map
- minimum=value [required]
- Minimum input/output data value
- maximum=value [required]
- Maximum input/output data value
- contrast=value [required]
- Contrast (gain, 8bit=>[1.0-3.0]
- Default: 1.0
- brightness=value [required]
- Brightness (bias, 8bit=>[0.0-100.0])
- Default: 0.0
The
r.colors.contrastbrightness module generates
a contrasted version of the input raster map.
The contrast is the gain of the affine transform, use values of 1.0-3.0 in case of an 8 bit image.
The brightness is the bias of the affine transform, use values of 0.0-100.0 in case of an 8 bit image.
Contrast enhancement of an 8-bit raster band
This does nothing to the image:
r.colors.contrastbrightness min=0.0 max=255.0 contrast=1.0 brightness=0.0 input=myinraster output=myoutraster
This does change the contrast of the image:
r.colors.contrastbrightness min=0.0 max=255.0 contrast=3.0 brightness=0.0 input=myinraster output=myoutraster
This does change the brightness of the image:
r.colors.contrastbrightness min=0.0 max=255.0 contrast=1.0 brightness=100.0 input=myinraster output=myoutraster
r.colors,
v.colors,
r3.colors,
r.cpt2grass,
r.colors.matplotlib
Yann Chemin,
JRC, Ispra, Italy
SOURCE CODE
Available at:
r.colors.contrastbrightness source code
(history)
Latest change: Monday Jan 30 19:49:11 2023 in commit: 5fb6b1a969e72db28df78483d3360b15a17f0c68
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GRASS GIS 8.4.1dev Reference Manual