[gdal-dev] Automatically creating an Alpha mask for a RGB raster to extract the backgound? (magic wand style)

[Even Rouault]

> I'm looking for an automated/semi-automated way to remove the plain color
> background of some (jpeg compressed) Orthophoto RGB rasters without
> NoDataValue or an Alpha band.

https://www.gdal.org/nearblack.html ?

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