GDAL-RASTER-NODATA-TO-ALPHA(1) GDAL GDAL-RASTER-NODATA-TO-ALPHA(1)
gdal-raster-nodata-to-alpha - Replace nodata value(s) with an alpha
band
Added in version 3.12.
Usage: gdal raster nodata-to-alpha [OPTIONS] <INPUT> <OUTPUT>
Replace nodata value(s) with an alpha band.
Positional arguments:
-i, --input <INPUT> Input raster datasets [required]
-o, --output <OUTPUT> Output raster dataset [required]
Common Options:
-h, --help Display help message and exit
--json-usage Display usage as JSON document and exit
--config <KEY>=<VALUE> Configuration option [may be repeated]
-q, --quiet Quiet mode (no progress bar)
Options:
-f, --of, --format, --output-format <OUTPUT-FORMAT> Output format ("GDALG" allowed)
--co, --creation-option <KEY>=<VALUE> Creation option [may be repeated]
--overwrite Whether overwriting existing output is allowed
Mutually exclusive with --append
--append Append as a subdataset to existing output
Mutually exclusive with --overwrite
--nodata <NODATA> Override nodata value of input band(s) (numeric value, 'nan', 'inf', '-inf') [may be repeated]
Advanced Options:
--if, --input-format <INPUT-FORMAT> Input formats [may be repeated]
--oo, --open-option <KEY>=<VALUE> Open options [may be repeated]
gdal raster nodata-to-alpha adds an alpha band based on the nodata
value metadata set on the bands of the input dataset.
If there is no explicit nodata value on the input dataset, it is
possible to add it with the --nodata option.
This program is a no-op and can be safely used if the input dataset
has no nodata value and --nodata is not specified.
--nodata <NODATA>
Override nodata value of input band(s) (numeric value, 'nan',
'inf', '-inf'). Either one value can be specified or as many
values as they are input bands. When multiple values are
specified, a pixel is considered as invalid only if it matches
the nodata values on all bands.
--co, --creation-option <NAME>=<VALUE>
Many formats have one or more optional creation options that
can be used to control particulars about the file created. For
instance, the GeoTIFF driver supports creation options to
control compression, and whether the file should be tiled.
May be repeated.
The creation options available vary by format driver, and some
simple formats have no creation options at all. A list of
options supported for a format can be listed with the
--formats command line option but the documentation for the
format is the definitive source of information on driver
creation options. See Raster drivers format specific
documentation for legal creation options for each format.
-f, --of, --format, --output-format <OUTPUT-FORMAT>
Which output raster format to use. Allowed values may be given
by gdal --formats | grep raster | grep rw | sort
--ot, --datatype, --output-data-type <OUTPUT-DATA-TYPE>
Output data type among Byte, Int8, UInt16, Int16, UInt32,
Int32, UInt64, Int64, CInt16, CInt32, Float32, Float64,
CFloat32, CFloat64.
GDALG OUTPUT (ON-THE-FLY / STREAMED DATASET)
This program supports serializing the command line as a JSON file
using the GDALG output format. The resulting file can then be opened
as a raster dataset using the GDALG: GDAL Streamed Algorithm driver,
and apply the specified pipeline in a on-the-fly / streamed way.
Example 1
$ gdal raster nodata-to-alpha input_with_nodata.tif output_with_alpha_band.tif
Even Rouault <even.rouault@spatialys.com>
1998-2026
March 20, 2026 GDAL-RASTER-NODATA-TO-ALPHA(1)
NAME
gdal-raster-nodata-to-alpha - Replace nodata value(s) with an alpha
band
Added in version 3.12.
SYNOPSIS
Usage: gdal raster nodata-to-alpha [OPTIONS] <INPUT> <OUTPUT>
Replace nodata value(s) with an alpha band.
Positional arguments:
-i, --input <INPUT> Input raster datasets [required]
-o, --output <OUTPUT> Output raster dataset [required]
Common Options:
-h, --help Display help message and exit
--json-usage Display usage as JSON document and exit
--config <KEY>=<VALUE> Configuration option [may be repeated]
-q, --quiet Quiet mode (no progress bar)
Options:
-f, --of, --format, --output-format <OUTPUT-FORMAT> Output format ("GDALG" allowed)
--co, --creation-option <KEY>=<VALUE> Creation option [may be repeated]
--overwrite Whether overwriting existing output is allowed
Mutually exclusive with --append
--append Append as a subdataset to existing output
Mutually exclusive with --overwrite
--nodata <NODATA> Override nodata value of input band(s) (numeric value, 'nan', 'inf', '-inf') [may be repeated]
Advanced Options:
--if, --input-format <INPUT-FORMAT> Input formats [may be repeated]
--oo, --open-option <KEY>=<VALUE> Open options [may be repeated]
DESCRIPTION
gdal raster nodata-to-alpha adds an alpha band based on the nodata
value metadata set on the bands of the input dataset.
If there is no explicit nodata value on the input dataset, it is
possible to add it with the --nodata option.
This program is a no-op and can be safely used if the input dataset
has no nodata value and --nodata is not specified.
Options
--nodata <NODATA>
Override nodata value of input band(s) (numeric value, 'nan',
'inf', '-inf'). Either one value can be specified or as many
values as they are input bands. When multiple values are
specified, a pixel is considered as invalid only if it matches
the nodata values on all bands.
--co, --creation-option <NAME>=<VALUE>
Many formats have one or more optional creation options that
can be used to control particulars about the file created. For
instance, the GeoTIFF driver supports creation options to
control compression, and whether the file should be tiled.
May be repeated.
The creation options available vary by format driver, and some
simple formats have no creation options at all. A list of
options supported for a format can be listed with the
--formats command line option but the documentation for the
format is the definitive source of information on driver
creation options. See Raster drivers format specific
documentation for legal creation options for each format.
-f, --of, --format, --output-format <OUTPUT-FORMAT>
Which output raster format to use. Allowed values may be given
by gdal --formats | grep raster | grep rw | sort
--ot, --datatype, --output-data-type <OUTPUT-DATA-TYPE>
Output data type among Byte, Int8, UInt16, Int16, UInt32,
Int32, UInt64, Int64, CInt16, CInt32, Float32, Float64,
CFloat32, CFloat64.
GDALG OUTPUT (ON-THE-FLY / STREAMED DATASET)
This program supports serializing the command line as a JSON file
using the GDALG output format. The resulting file can then be opened
as a raster dataset using the GDALG: GDAL Streamed Algorithm driver,
and apply the specified pipeline in a on-the-fly / streamed way.
EXAMPLES
Example 1
$ gdal raster nodata-to-alpha input_with_nodata.tif output_with_alpha_band.tif
AUTHOR
Even Rouault <even.rouault@spatialys.com>
COPYRIGHT
1998-2026
March 20, 2026 GDAL-RASTER-NODATA-TO-ALPHA(1)