Extract an image's dataset-level mask and write to a new file.
A Rasterio plugin for extracting an image’s dataset-level mask.
Usage: rio ds-mask [OPTIONS] INPUT OUTPUT Extract an image's dataset-level mask. Both output driver and datatype are derived from the input image if not given. In some cases this plugin alters GDAL's returned mask values. When writing masks GDAL uses 0's for opaque and 255's for transparent, but when reading masks the returned value differs based on the image's datatype. 8 bit images produce 8 bit masks where 0's are opaque and 255's are transparent, however 16 bit images use 0's for opaque and 1's for transparent, still stored as 8 bit. If the image's datatype is 'int16' or 'uint16' and the mask's maximum value is 1, then all 1's are translated to 255's. The mask's datatype is preserved. I have not fully investigated all of GDAL's masking options to determine if the behavior is consistent. If it is found to be a deliberate choice then the normalization will be removed. Options: -f, --format, --driver TEXT Output format driver -t, --dtype [ubyte|uint8|uint16|int16|uint32|int32|float32|float64] Output data type. --co, --profile NAME=VALUE Driver specific creation options.See the documentation for the selected output driver for more information. --help Show this message and exit.
This example command creates a singleband uint8 image that is acceptable to use as a GDAL mask band, meaning that pixels with a value of 255 are transparent and pixels with a vaue of 0 are opaque. The image is losslessly compressed and internally tiled.
$ rio ds-mask \ --driver GTiff \ tests/data/alpha.tif \ mask.tif \ --co COMPRESS=DEFLATE \ --co TILED=YES
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