[MapProxy] Transparent colors in layer

[Georg Aigner]

Hi

Currently i use type: tile to get a tile cached.
The image is cached correct.
The image has transparent background and a color WITH alpha channel in it.
But the image will not be delivered correctly to the requester. the alpha
channel in color will be ignored.
So in my case the gray will be displayed black.

any hints to configure this?

MapProxy Version 1.3.0

thx
basalt
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