Nope, this won't work: r->default_gamma = atof(msGetOutputFormatOption( format, "GAMMA", "0.75" )); if(r->default_gamma <= 0.0 || r->default_gamma >= 1.0) { r->default_gamma = 0.75; }
From mapagg.cpp lines 844-847 forces 0 < GAMMA < 1 Also note that MapServer uses a linear gamma function defined as double operator() (double x) const { if(x < m_start) return 0.0; if(x > m_end) return 1.0; return (x - m_start) / (m_end - m_start); } Where m_start is _always_ set to 0 and m_end is set to the GAMMA value given by you (or the default 0.75). I think someone should check this - to me it seems a power function was intented... HTH > -----Ursprüngliche Nachricht----- > Von: mapserver-users [mailto:mapserver-users-boun...@lists.osgeo.org] Im > Auftrag von lars.schylb...@blixtmail.se > Gesendet: Mittwoch, 18. Oktober 2017 14:05 > An: mapserver-users@lists.osgeo.org > Betreff: Re: [mapserver-users] Draw roads WITHOUT anti-aliasing > > Hi, > > > > > I did some quick tests with : > > > > > OUTPUTFORMAT > NAME "png_G0" > DRIVER AGG/PNG > MIMETYPE "image/png" > IMAGEMODE RGB > EXTENSION "png" > FORMATOPTION "GAMMA=0.0" > END > > > > > and shp2img with options -i > > > eg: shp2img -m 01_polygon_td_poly.map -o 01_polygon_td_poly.png -i > png_G0 > > > > > > I did some tests with both polygons, polygon outlines and lines and they > all seems to have anti-aliasing as far as I could see. > > Would this be an ok way to test it? I also have some people that would > like to do lines without anti-aliasing for a strange reason. > > > > > > Lars Schylberg > > > > > > -----Originalmeddelande----- > > Från: "Rahkonen Jukka (MML)" <jukka.rahko...@maanmittauslaitos.fi> > > Till: "Eichner, Andreas - SID" <andreas.eich...@sid.sachsen.de>, "Erik > H" <erik.h11...@gmail.com> > > Kopia: mapserver-users@lists.osgeo.org > > Datum: 2017-10-18 11:13 > > Ämne: Re: [mapserver-users] Draw roads WITHOUT anti-aliasing > > > > Hi, > > > > I suppose that the amount of antialiasing with AGG is set with "gamma" > parameter. Mapserver supports that at least for polygons as documented > in http://www.mapserver.org/mapfile/outputformat.html but you could try > if using gamma=0.0 has an effect on lines as well. It may be that it > does not because search > > > https://github.com/mapserver/mapserver/search?utf8=%E2%9C%93&q=gamma&typ > e= > > seems to find only something that is tied to polygon outlines > > https://github.com/mapserver/mapserver/blob/branch-7- > 0/renderers/agg/include/agg_renderer_outline_aa.h > > > > > > If gamma does not work for lines then it could be worth making a > feature request for adding a new formatoption "GAMMA_LINE=[]. > > > > Couple of Mapnik links dealing with the same issue: > > http://gis.19327.n8.nabble.com/Turning-off-anti-aliasing- > td5339458.html > > http://mapnik.org/mapnik-reference/#3.0.6/line-gamma-method > > > > -Jukka Rahkonen- > > > > > > > > -----Alkuperäinen viesti----- > > Lähettäjä: mapserver-users [mailto:mapserver-users- > boun...@lists.osgeo.org] Puolesta Eichner, Andreas - SID > > Lähetetty: 18. lokakuuta 2017 9:57 > > Vastaanottaja: Erik H <erik.h11...@gmail.com> > > Kopio: mapserver-users@lists.osgeo.org > > Aihe: Re: [mapserver-users] Draw roads WITHOUT anti-aliasing > > > > Damn... missed attaching the images. > > > > > -----Ursprüngliche Nachricht----- > > > Von: mapserver-users [mailto:mapserver-users- > boun...@lists.osgeo.org] > > > Im Auftrag von Eichner, Andreas - SID > > > Gesendet: Mittwoch, 18. Oktober 2017 08:28 > > > An: Erik H > > > Cc: mapserver-users@lists.osgeo.org > > > Betreff: Re: [mapserver-users] Draw roads WITHOUT anti-aliasing > > > > > > Hi, > > > > > > I just meant that it seems to be pretty easy to implement aliased > > > rendering with AGG. > > > Simply changing the typedef in line 91 of mapagg.cpp from > > > > > > typedef mapserver::renderer_scanline_aa_solid<renderer_base> > > > renderer_scanline; > > > > > > to > > > > > > typedef mapserver::renderer_scanline_bin_solid<renderer_base> > > > renderer_scanline; > > > > > > turns of anti-aliased rendering. I've attached the output of > "shp2img > > > -m line_simple.map" from the msautotests. > > > An additional member in class AGG2Renderer for the aliased > rasterizer > > > and conditionally passing one or the other to render_scanlines() > > > depending on some value of strokeStyleObj might be enough. > > > > > > Regards > > > > > > > -----Ursprüngliche Nachricht----- > > > > Von: Erik H [mailto:erik.h11...@gmail.com] > > > > Gesendet: Dienstag, 17. Oktober 2017 17:34 > > > > An: Eichner, Andreas - SID > > > > Cc: Richard Greenwood; mapserver-users@lists.osgeo.org > > > > Betreff: Re: [mapserver-users] Draw roads WITHOUT anti-aliasing > > > > > > > > As for Andreas' remark about 'simply the use of another scanline > > > > rasterizer.' - I'm sorry but I'm not much of a C++ developer. If I > > > have > > > > to do rasterizing, I'd skip MapServer altogether and generate the > > > > PNG > > > in > > > > Java. > > > > > > > _______________________________________________ > > > mapserver-users mailing list > > > mapserver-users@lists.osgeo.org > > > https://lists.osgeo.org/mailman/listinfo/mapserver-users > > _______________________________________________ > > mapserver-users mailing list > > mapserver-users@lists.osgeo.org > > https://lists.osgeo.org/mailman/listinfo/mapserver-users > > > > > > > > -- > > _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/mapserver-users