Assefa, Stranglely, adding MIMETYPE "image/png" or MIMETYPE "image/png; mode=24bit" gives a 24 bit file, anti-aliased, but with grey instead of a white background.
Brent Fraser GeoAnalytic Inc. Calgary, Alberta ----- Original Message ----- From: "Yewondwossen Assefa" <[EMAIL PROTECTED]> To: "Brent Fraser" <[EMAIL PROTECTED]> Cc: <[email protected]> Sent: Thursday, August 23, 2007 2:18 PM Subject: Re: [UMN_MAPSERVER-USERS] AGG and WMS > Brent, > > I think what happens is the following : when mapserver gets your wms > request with FORMAT=png, it selects the the GD PNG 8 bit driver. I am > not sure right now wms/outputformat should be handled so that this king > of situation does not happen. > A quick work around from what I can see would be > > - define an agg output format is your map file : > OUTPUTFORMAT > NAME "agg/png24" > MIMETYPE "image/png; mode=24bit" > DRIVER "AGG/PNG" > EXTENSION "png" > END > > - set you imagetyppe in the map file to be IMAGETYPE agg/png24 > > - when doing a wms request use FORMAT=image/png; mode=24bit > > This should ensure that your agg output format is used. > > Best Regards, > > > Brent Fraser wrote: > > Christopher, > > > > Sorry for the terse question, here are some more > > details... > > > > I'm using the AGG/PNG output driver (see RFC-32) in > > Mapserver 5.0 beta 4 to render shapefile vectors (no raster > > input) to a PNG graphic file. When I use Mapserver's CGI > > interface to request a graphic map, the lines appear > > anti-aliased (smooth, no jaggies) Great! But when I use > > Mapserver's WMS interface, I get the same old rendering > > Mapserver always gave (lines with jaggies). > > > > Note there was an email > > (http://lists.umn.edu/cgi-bin/wa?A2=ind0703&L=mapserver-dev&; > > T=0&O=D&X=639F0B08FDD720FAC9&P=6714) saying "WSM right now > > only advertise gd and gdal based drivers. See bug 455". > > > > > > After some review of the images, it looks like my "DRIVER > > AGG/PNG" produces a 24 bit png file via CGI, but an 8 bit > > png file via WMS. When I try to do AGG/PNG24, I get > > "General error message. OUTPUTFORMAT clause references > > driver AGG/PNG24, but this driver isn't configured." from > > Mapserver. I'll have to do some more digging... > > > > Brent Fraser > > GeoAnalytic Inc. > > Calgary, Alberta > > > > ----- Original Message ----- > > From: "Christopher Schmidt" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: Thursday, August 23, 2007 1:03 PM > > Subject: Re: [UMN_MAPSERVER-USERS] AGG and WMS > > > > > >> On Thu, Aug 23, 2007 at 12:32:41PM -0600, Brent Fraser > > wrote: > >>> Is AGG supposed to do anti-aliased output when Mapserver > > is > >>> used as a WMS server? > >> I'm not sure what 'antialiased' output means -- perhaps > > you mean 'alpha > >> transparency', perhaps you mean antialiasing within the > > images, perhaps > >> you mean something else. Can you clarify? > >> > >> The answer to the first is, I believe, "no". WMS spec > > only allows for > >> 'transparency or no transparency', and MapServer does not > > implement > >> alpha transparency output in the WMS images. > >> > >> The answer to the second is "Sure" -- the images for > >> http://boston.freemap.in/ are fetched from WMS (by > > TileCache). > >> Regards, > >> -- > >> Christopher Schmidt > >> MetaCarta > > > > > -- > ---------------------------------------------------------- ------ > Assefa Yewondwossen > Software Analyst > > Email: [EMAIL PROTECTED] > http://www.dmsolutions.ca/ > > Phone: (613) 565-5056 (ext 14) > Fax: (613) 565-0925 > ---------------------------------------------------------- ------ >
