[MapProxy] Image compressing

[Andreas Trawoeger]

Hi Johan!

2011/4/6 Johan Sandberg <johs at kth.se>

>  Hello! I have seen that mapproxy seem to make the image sizes smaller.
> When requesting an image directly to the WMS and the same image to Mapproxy,
> its 2/3 of the WMS image in size.
> Is there som builtd in mechanism in MP that compress the image?
> Both requested images are png by the way.
>

What you are likely seeing is PNG-8 color quantization:
http://mapproxy.org/blog/improving-the-performance-for-png-requests
I couldn't find it in the MapProxy change log, but I think PNG-8 became
default in MapProxy 0.9.0 (the blog post is about version 0.8.x).

cu andreas
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