Anti Aliasing

[Zhonghai Wang]

antialiasing true/off works well, and what you have to do are:

1. comment your "OUTPUTFORMAT...END"ONJECT, add "IMAGETYPE PNG24"
2. set "TRANSPARENCY ALPHA" in your layer object
3. set "ANTIALIAS TRUE" in style object.

that's all!

zhonghai

17.05.2006

On 5/17/06, Doyon, Jean-Francois <Jean-Francois.Doyon at ccrs.nrcan.gc.ca>
wrote:
>
> Interesting ... My reading of the docs suggests that TRANSPARENCY ALPHA
> should only respect the alpha channel in pixmap symbols ...
>
> Yet apparently rendered line work (which isn't pixmap based) is also
> "smoothed"?  Is that right?
>
> J.F.
>
> -----Original Message-----
> From: UMN MapServer Users List [mailto:MAPSERVER-USERS at lists.umn.edu] On
> Behalf Of ramesh karra
> Sent: May 16, 2006 6:07 PM
> To: MAPSERVER-USERS at lists.umn.edu
> Subject: Re: [UMN_MAPSERVER-USERS] Anti Aliasing
>
> Thanks steve!
>
> I have upgraded to 4.8.3 and the roads/lines are smooth... Looks really
> good.
>
> Thanks
> Ramesh
>
> --- Steve Lime <Steve.Lime at DNR.STATE.MN.US> wrote:
>
> > You need 4.8 or later to use antialiasing... ;-)
> >
> > >>> ramesh karra <karrarm at yahoo.com> 5/16/2006
> > 1:35:15 PM >>>
> > Thanks steve!
> >
> > I made the changes you suggested but I started getting script errors.
> > It looks like the errors are due to 'PNG24'. I am using Mapserver 4.6.
> > Do I need to use
> > 4.8 or later to successfully use PNG24?
> >
> > Thanks
> > Krishna
> >
> > --- Steve Lime <Steve.Lime at DNR.STATE.MN.US> wrote:
> >
> > > You need a couple of other things:
> > >
> > >   - a 24-bit output format (e.g. IMAGETYPE PNG24)
> > >   - alpha blending turned on for the layer (e.g.
> > > TRANSPARENCY ALPHA)
> > >
> > > That should get it working...
> > >
> > > Steve
> > >
> > > Stephen Lime
> > > Data & Applications Manager
> > >
> > > Minnesota DNR
> > > 500 Lafayette Road
> > > St. Paul, MN 55155
> > > 651-259-5473
> > > >>> ramesh karra <karrarm at YAHOO.COM> 05/15/06 6:49
> > > PM >>>
> > > Hi,
> > >
> > > I have added 'ANTIALIAS TRUE' to all my STYLE objects but I do not
> > > see any difference in the map that's displayed. I was hoping to see
> > > smooth lines but there was no difference in the way
> > > lines(representing
> > > roads)
> > > are drawn with or without anti-aliasing. Is this
> > the
> > > expected behavior? How can I get smooth lines?
> > >
> > > My layer is defined as follows:
> > >
> > > LAYER
> > >     NAME         roads
> > >     DATA         droad1
> > >     STATUS       OFF
> > >     TYPE         LINE
> > >
> > >     PROJECTION
> > >      "init=epsg:4326"
> > >     END
> > >
> > >     CLASS
> > >       NAME       "Roads"
> > >       MAXSCALE     80000
> > >       MINSCALE     20000
> > >       STYLE
> > >     ANTIALIAS    TRUE
> > >     COLOR        150 150 150
> > >     WIDTH        3
> > >       END
> > >       STYLE
> > >     ANTIALIAS    TRUE
> > >         COLOR            255 255 255
> > >     WIDTH        1
> > >       END
> > >     END
> > > END
> > >
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