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
