Christy, I suspect this is due to a bug in libpng. see http://sourceforge.net/tracker/index.php?func=detail&aid=3288207&group_id=5624&atid=105624 .
On Wed, Apr 20, 2011 at 15:20, Christy Nieman <cnie...@dmsolutions.ca> wrote: > Hi, > > I compiled MapServer 6.0 beta6 against libpng 1.5.2 and encountered the > following problems: > > when using the default png IMAGETYPE (i.e. no OUTPUTFORMAT block), I got > yellow & striped maps (see cyprus.png) > when using the AGG/PNG driver and IMAGEMODE "RGBA", the output image looks > fine > when using the default png8 IMAGETYPE, the output image looks fine > > I also compiled with cairo, and with the driver set to CAIRO/PNG, I had the > same yellow & striped maps. rgba and png8 use different png formats. agg/png and cairo/png use the same codepath when saving images, so the behavior your are observing is normal. > > With libpng 1.2.44, everything seems to work properly. Has anyone else seen > this problem with libpng 1.5? Should it work properly with MapServer? > > Regards, > Christy > > _______________________________________________ > mapserver-users mailing list > mapserver-users@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/mapserver-users > > _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users