artemp/trac2github — Issue #446: Garbled icons in png256 tiles
Author: artemp
Created: 2011-10-09 20:34:41+00:00
State: open
Labels: Core_Library

I'm creating transparent tiles with a bunch of markers (PointSymbolizer) which I plan to overlay onto google maps. I'm using the generate_tiles.py script from osm, which by default creates 'png256' tiles. The icons are garbled. This doesn't happen with 'png' format.

I tried this on windows using latest mapnik 0.6.1 and imagemagick 6.5.6.8-Q8 binaries. I also tried on Debian following the DebianInstall instructions from the wiki to build from svn sources. I got the same results on both machines.

I'm attaching the files needed to reproduce this.