[MapProxy] Compressing JPEG tiles in YCbCr color space?

[Johannes Kröger (WhereGroup)]

Hey folk :)

For compressing JPEG imagery it is highly useful to use the YCbCr color 
space (see e.g. Paul Ramsey's classic 
https://blog.cleverelephant.ca/2015/02/geotiff-compression-for-dummies.html 
). The compression rate is much higher.

Is this possible to setup with MapProxy when using JPEG or GeoTIFF tiles 
in a cache? I assume it uses RGB by default, at least that's what my 
googling around PIL/Pillow's default settings got me.

If not, would MapProxy still work as intended and allow a QGIS client to 
consume its output via WMS/WMTS fine if I was to reencode the tiles in 
the cache in YCbCr myself?

Cheers, Hannes
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