[mapserver-users] Difference in GD vs AGG PNG output -- seams in my shape files.

[Dane Springmeyer]

You might try setting a map background color the same as your ocean  
color used for the polygons.

Dane


On May 3, 2010, at 2:03 PM, Mark Deneen wrote:

> Steve,
>
> I had just tried adding an outline before I received this message.  It
> helps, but at the expense of my coastline.  This is, however, not a
> terrible issue because you can still see the detail as you zoom in  
> further.
>
> Thanks,
> Mark
> On 5/3/2010 4:38 PM, Lime, Steve D (DNR) wrote:
>> You may be seeing some deficiencies in the analytical AA algorithm  
>> AGG uses. I remember reading about it awhile back in discussions  
>> about  alternative algorithms and recall it being prominent with  
>> vertical edges. Have you tried setting an outline color to the same  
>> value as your fill color? That may help.
>>
>> Steve
>> ________________________________________
>> From: mapserver-users-bounces at lists.osgeo.org [mapserver-users-bounces at lists.osgeo.org 
>> ] On Behalf Of Mark Deneen [mdeneen at gmail.com]
>> Sent: Monday, May 03, 2010 2:42 PM
>> To: mapserver-users at lists.osgeo.org
>> Subject: [mapserver-users] Difference in GD vs AGG PNG output --  
>> seams in my    shape files.
>>
>> Hi,
>>
>> I recently upgraded from 5.2.x to 5.6.1, and from GD to AGG.
>>
>> Here is my output:
>>
>> AGG: http://i44.tinypic.com/5oh261.png
>>
>> GD: http://i39.tinypic.com/2h4j409.png
>>
>> Visual Representation of the shapefile: http://i44.tinypic.com/1zz2u76.png
>>
>> Look north of Cancun -- the AGG driver is showing seams where the  
>> polygons connect in my shape file.  It doesn't do it for all of  
>> them, but I see it a lot, especially when the seams are not  
>> straight N/S or E/W.  I feel that it has something to do with AGG's  
>> antialiasing, but I've not been able to pin it down.
>>
>> Is there any way to resolve this?  I'd really like to use the AGG  
>> driver, I love the output it produces, minus the white lines!
>>
>> Mark
>>
>>
>
>
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