[MapProxy] inverting a map

[A.Pirard.Papou]

Hi,

A map server S is designed with white background.
JOSM is designed with black background.
The JOSM layer displays badly on S white background.
JOSM displays correctly with the other servers.

The drastic solution would be to invert the colors of S.
This would make S a black background server.
Can mapproxy invert the colors of what it is serving?
Or can it call a program to modify the data it outputs?

TIA,
Cheers,

André.


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