On Sep 3, 2010, at 8:20 AM, Dražen Odobašić wrote: > On 01.09.2010 11:17, [email protected] wrote: >> Hi, >> >> I'll just patch mapnik's ogcserver (if you are using it, of course). We are >> using a copy of ogcserver for each wms service instead of a global installed >> one. This means there is no problem in doing such an ugly hack :) because it >> will affect just that service. >> >> The image won't hit the disk until cached and it will also save you the >> hassle of running a script afterwards. Tell me if the performance is >> acceptable, perhaps we can make a patch until support is added to mapnik. >> >> File common.py: >> >> class WMSBaseServiceHandler(BaseServiceHandler): >> >> def GetMap(self, params): >> m = self._buildMap(params) >> im = Image(params['width'], params['height']) >> render(m, im) >> format = PIL_TYPE_MAPPING[params['format']] >> import PIL, StringIO >> img = PIL.Image.open(StringIO.StringIO(im.tostring(format))) >> img = self.reduce_opacity(img, 0.5) >> buf = StringIO.StringIO() >> img.save(buf, format=format) >> return Response(params['format'].replace('8',''), buf.getvalue()) >> >> def reduce_opacity(self, im, opacity): >> import ImageEnhance >> """Returns an image with reduced opacity.""" >> assert opacity>= 0 and opacity<= 1 >> if im.mode != 'RGBA': >> im = im.convert('RGBA') >> else: >> im = im.copy() >> alpha = im.split()[3] >> alpha = ImageEnhance.Brightness(alpha).enhance(opacity) >> im.putalpha(alpha) >> return im >> >> > > Hi, > > i've actually done something similar, customized rendering pipeline to check > whether final rendering should be transparent or not. > > Would it be feasible to add this kinda support directly to mapnik core? >
Yes, absolutely. Drazen, could you please add a ticket to trac and set the Milestone to: http://trac.mapnik.org/milestone/MCS1%20Tickets I'd like to take a look at implementing this at the sprint next week. > Dražen > _______________________________________________ > Mapnik-users mailing list > [email protected] > https://lists.berlios.de/mailman/listinfo/mapnik-users _______________________________________________ Mapnik-users mailing list [email protected] https://lists.berlios.de/mailman/listinfo/mapnik-users
