Anti Aliasing

[Delfos, Jacob]

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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