Anti Aliasing
Zhonghai Wang
zhonghaiw at GMAIL.COM
Tue May 16 05:49:40 PDT 2006
that's it!!! It's perfect!!
thanks, Perry.
16.05.2006
On 5/16/06, Pericles S. Nacionales <naci0002 at umn.edu> wrote:
>
> Get rid of the OUTPUTFORMAT object and just add IMAGETYPE PNG24. See
> what happens.
>
> -Perry
>
> Zhonghai Wang wrote:
> > Hi, Jacob,
> >
> > you mean like this:
> >
> > *****output format:
> >
> > OUTPUTFORMAT
> > NAME "PNG24"
> > MIMETYPE "image/PNG"
> > DRIVER "GD/PNG"
> > EXTENSION "PNG"
> > IMAGEMODE RGBA
> > #TRANSPARENT ON
> > #TRANSPARENCY ALPHA
> > END
> >
> > ******layer definition:
> > LAYER
> > NAME "railway"
> > STATUS DEFAULT
> > TYPE LINE
> > CONNECTIONTYPE OGR
> > CONNECTION "CA_NAV_RAILRDS.TAB"
> > MAXSCALE 8000
> > SYMBOLSCALE 4000
> > TRANSPARENCY ALPHA
> > PROJECTION
> > "init=epsg:4326"
> > END
> > CLASS
> > NAME "railway"
> > STYLE
> > SYMBOL 'point'
> > COLOR 0 0 0
> > SIZE 5
> > MINSIZE 1
> > MAXSIZE 5
> > ANTIALIAS TRUE
> > END
> > STYLE
> > SYMBOL "dashedline"
> > COLOR 255 255 255
> > SIZE 3
> > MINSIZE 0
> > MAXSIZE 3
> > ANTIALIAS TRUE
> > END
> > END
> >
> > **
> >
> > if all the definition is right, this function does not really make the
> > output image nicer. and I've noticed that ANTIALIAS TRUE/FALSE is only
> > useful for truetype font, but not for line features, which means only
> > for truetype font symbols. or Did I do anything wrong?
> >
> >
> > On 5/16/06, *Delfos, Jacob* <Jacob.Delfos at maunsell.com
> > <mailto:Jacob.Delfos at maunsell.com>> wrote:
> >
> > Zhonghai,
> >
> > PNG is 8bit, PNG24 is 24bit colour, with an 8bit transparency. So
> for
> > the ALPHA option, I think you need PNG24. Try this definition:
> >
> > OUTPUTFORMAT
> > NAME PNG24
> > DRIVER "GD/PNG"
> > MIMETYPE "image/png"
> > EXTENSION PNG
> > IMAGEMODE RGBA
> > END
> >
> > Then put:
> >
> > TRANSPARENCY ALPHA
> >
> > in your layer definition (not in OUTPUTFORMAT).
> >
> > regards,
> >
> > Jacob
> >
> >
> >
> > ________________________________
> >
> > From: UMN MapServer Users List
> > [mailto:MAPSERVER-USERS at LISTS.UMN.EDU
> > <mailto:MAPSERVER-USERS at LISTS.UMN.EDU>] On Behalf Of Zhonghai Wang
> > Sent: 16 May 2006 16:14
> > To: MAPSERVER-USERS at LISTS.UMN.EDU
> > <mailto:MAPSERVER-USERS at LISTS.UMN.EDU>
> > Subject: Re: [UMN_MAPSERVER-USERS] Anti Aliasing
> >
> >
> > Hi,
> >
> > I am interested in this question, and I've tried like this:
> >
> > *****
> > OUTPUTFORMAT
> > NAME "PNG"
> > MIMETYPE "image/PNG"
> > DRIVER "GD/PNG"
> > EXTENSION "PNG"
> > IMAGEMODE RGBA
> > TRANSPARENCY ALPHA
> > END
> > *****
> > I've noticed that there is no PNG24 output image format in
> the
> > mapfile reference document, and therefore I've used PNG.
> >
> > but, I get the followig error message:
> >
> > loadOutputFormat(): Unknown identifier. Parsing error near
> > (TRANSPARENCY):(line 114)
> >
> > which means I caon only use TRANSPARENT as the the identifier
> as
> > listed in the mapfile reference document, and this parameter can
> > only be
> > truned on or off.
> >
> > any further ideas, Steve?
> >
> > 1000 thanks.
> >
> > zhonghai
> >
> >
> > On 5/16/06, ramesh karra <karrarm at yahoo.com
> > <mailto:karrarm at yahoo.com>> wrote:
> >
> > 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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> >
> >
> >
>
>
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