[MapProxy] Utilizing jpegpng (mixed mode) of an Arcgis ImageServer without doing jpeg /png conversion in mapproxy.

[B H]

Hi,
Is there a way to achieve this without doing any png to
jpg conversion mapproxy (there is not much CPU on the server I want to run
mapproxy on)? If there is some other software I should be using for this
use-case, I would really appreciate pointers to it.

We have an arcgis Imageserver for satellite Imagery that has /exportImage
endpoint with jpegpng as a format ( which I believe is the same as the
mixed mode provided by mapproxy i.e. jpeg for opaque images and png for
images with transparency).
Since the client expects the images in tile format, I want to put mapproxy
in between so that mapproxy can do the magic of translating the tile url to
exportImage...

But as far as I could figure out,  I can use mapproxy to
a) Use jpeg ( which loses the transparency.)
b) Use png ( which means the size of tiles increases significantly. )
c) Use mixed mode : which means mapproxy will do the conversion of png to
jpeg, and request the data in png format from the Arcgis ImageServer).

d) The option where mapproxy just gets thes data from ImageServer ( This
option does not seem to exist).

Thanks,
Hemant
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