[MapProxy] MapProxy Image Quality

[Bastien DEBLAIS]

Hi,

I'm trying to configure a local mapserver source.
I've trouble with the quality of PNG images wich I found very poor for 
Vector layer.

What is the best configuration for the Higher image quality?

I use MapProxy 1.1.2

My configuration:
caches:
   my_cache:
     grids: [my_grid]
     sources: [my_source]
     image:
       resampling_method: bicubic
       format: image/png
       transparent: true
       mode: RGBA

I also tried "paletted: false", but the image is still poor.

Thanks in advance for reply.
Regards.

sample of this quality:
http://www.flickr.com/photos/65645460@N07/5977642867/
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