Looks like the grey background is a problem with Internet Explorer 6 and png files.
Brent Fraser GeoAnalytic Inc. Calgary, Alberta ----- Original Message ----- From: "Brent Fraser" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Thursday, August 23, 2007 2:28 PM Subject: Re: [UMN_MAPSERVER-USERS] AGG and WMS > 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 > > ---------------------------------------------------------- > ------ > >
