Hi, For testing, what is wrong, could You provide sample tile rendered with png and png256 format (same region, only different format). You could create ticket: http://trac.mapnik.org/report and add attachment.
Meantime, You can try using "png256:m=h" instead of "png256", see if it helps. Regards, Marcin Rudowski W dniu 06.01.2011 09:07, Nicolas Gillet - MARKET-IP pisze: > Dane, > > Sorry I forgot the most important informations. > I use mapnik 0.7.1 and the raster plugin used is gdal. > It's a C++ application I wrote above mapnik to generate images and I only > changed the parameter "png" by "png256" for the render method. > Then I regenerated all my rasters and tried to generate small tiles out of > the raster with the same application. > Those last tiles are in a poor quality of gray scale. > > Nicolas > > -----Original Message----- > From: Dane Springmeyer [mailto:[email protected]] > Sent: Wednesday, January 05, 2011 7:07 PM > To: Nicolas Gillet > Cc: [email protected] > Subject: Re: [Mapnik-users] png256 rasters becoming black and white > > Nicolas, > > What mapnik versions are you comparing? > > Dane > > > On Jan 5, 2011, at 7:52 AM, Nicolas Gillet wrote: > >> >> Dear List, >> >> I use Mapnik to generate large tiles as rasters. >> Those rasters are then used to generate small tiles on demand. (with > Mapnik >> too) >> >> Up until now this worked fine but rendering all that in png lead to heavy >> tiles. >> I decided to switch then from png to png256. >> >> There comes the trick. >> My rasters are still perfectly rendered but when rendering tiles out of >> those rasters, the tiles are in black and white. This wasn't the case >> previously. >> >> Is there an explanation to this and a workaround ? >> >> Thanks a lot for any hint. >> _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
