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I want to eliminate near black pixels around edges of Landsat-8 overview. I'm interested in doing it not for the entire image but some extent, so I clipped it. I tried using GDAL nearblack utility, but faced the problem that it doesn't take into account image border pixels.

Calling

nearblack -of GTiff -nb 1 -o mask.tif input.tif

Produces following result:

nearblack -of GTiff -nb 1 -o mask.tif input.tif When I expected that the output would have looked like this: desired output

Is there a way to force GDAL nearblack utility to ignore pixels around image borders? To achieve my goal I also tried applying erosion with different structuring elements, but erosion produces "torn edges".

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