Anti Aliasing

[Vincent Schut]

Zhonghai Wang wrote:
> Hi Vincent,
>  
> have you got a nice map image with the ANTIALIAS TRUE ?
>  
> if so , can you give me a clue how to do that?
>
Unfortunately not, that's why I'm asking these questions... I was
experimenting with antialiasing, but kept getting segmentation faults or
premature end of script errors in my apache logs. But I did not put the
'transparency alpha' in my map laysers, because most of my layers for
which I wanted aa are currently semitransparent polygons...
I'll experiment with the transparency alpha thing later and post to the
list if it worked.

Vincent.

PS please do not only post your questions directly to me (or whoever
posted a message to the list) but also to the list again (reply to all
usually works well), so others can learn from it and/or share their
experience.
>  
> On 5/16/06, *Vincent Schut* <schut at sarvision.nl
> <mailto:schut at sarvision.nl>> wrote:
>
>     Steve Lime 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...
>
>     To chime in:
>     But what if I want to have antialiasing *and* semi-transparency? How
>     would I define e.g. a opacity of 60 when I already have 'transparency
>     alpha' in my layer?
>
>     Vincent.
>
>     >
>     > Steve
>     >
>     > Stephen Lime
>     > Data & Applications Manager
>     >
>     > Minnesota DNR
>     > 500 Lafayette Road
>     > St. Paul, MN 55155
>     > 651-259-5473
>     >>>> ramesh karra <karrarm at YAHOO.COM <mailto: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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