[OSM-talk] tiles at home: png files not in indexed mode

[Wollschaf]

Hello all!

Currently, the generated osm at home tiles are quite big. Reducing the colors
to 256 saves more than 50% of required diskspace and traffic -
almost without artifacts. At certain zoom levels, some pixel-sized errors
appear on narrowly rendered roads, but in my opinion the savings outweigh
the errors by far.

ImageMagick is required, though... 

convert in.png -colors 256 -quality 90 out.png

Some example filesizes:
26KB -> 9KB
49.5KB -> 18.5KB
56.6KB -> 26KB

Any comments?

Greetings,
Wollschaf