[MapProxy] Tile masking interpolation

[David Pavlíček]

Hello, we have recently implemented MapProxy authorization with
restrictions to polygon. Everything works fine, except that tiles which are
intersected by polygon boundary looks different than rest of tiles (see
example below). I thing that it is due to image interpolation. My question
is: Is there any way how I can change (or disable) interpolation during
tile masking?

Example:
First image is masked with polygon (tile intersects polygon boundary).
Second image is the same tile, but without polygon mask applied on it.
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