[gdal-dev] nearblack on multi GB images very slow

[mhw-at-yg]

mhw-at-yg wrote
> I have a lot of multi GB images that are unfortunately jpeg-in-geotiff
> encoded before nodata was properly defined. As a result they all suffer
> from
> the jagged edges problem.
> <http://osgeo-org.1560.x6.nabble.com/file/t192661/WVpPW.png> 
> 
> I've defined a method for adding a nodata mask side-car file that works
> around this: 
> https://gis.stackexchange.com/questions/387877/add-a-nodata-mask-or-alpha-band-to-read-only-image/

Here's a windows bat file to recursively create masks for all TIF images in
a directory tree. It's for the scenario where you can write to the folder
where the images are stored:
https://github.com/maphew/gdal-plus/blob/master/bin/readonly-nearblack.bat



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-Matt
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