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

[Mark Deneen]

Thomas,

Thank you for this information.  Does this negatively impact performance?

Mark

On 5/4/2010 4:02 AM, thomas bonfort wrote:
> 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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>>> mapserver-users at lists.osgeo.org
>>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
>>>       
>> _______________________________________________
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>>     


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