Anti Aliasing

[Zhonghai Wang]

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> 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] On Behalf Of Zhonghai Wang
>        Sent: 16 May 2006 16:14
>        To: 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> 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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