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

[thomas bonfort]

see http://trac.osgeo.org/mapserver/ticket/3165 for an explanation and a patch.

regards,
thomas

On Tue, May 4, 2010 at 08:37, Dane Springmeyer <blake at hailmail.net> wrote:
> 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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>
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