Hi,
the fullWMS mode is something that is not used much, if at all, for a
number of reasons:

   - last I checked, it could not be setup via the GUI (so hard to find for
   many)
   - reading PNG tiles and re-assembling them is not particularly fast,
   it's convenient only if the original map is pretty slow (un-optimized
   raster, very complex vector map)
   - the rendering quality is poor, suitable mostly for resampling raster
   data, but blurs lines and labels in a normally unacceptable way

In my company we simply never use it, I remember trying it and getting
"foggy" results, but not disconnected lines as you did.
Just mind, the results of bilinear interpolation, even when the white line
disconnection is fixed, are not going to be the same as a
WMS rendering with bilinear, if you dataset is vector the interpolation
settings are not used at all, vectors are scaled to the targer
resolution before being drawn on the canvas.

I'd suggest you setup a small, reproducible test case, and submit it to
https://osgeo-org.atlassian.net/projects/GEOS/summary
If this has any urgency for you, I'd also check out commercial support
options at http://geoserver.org/support/

Cheers
Andrea

On Wed, Jun 12, 2019 at 3:24 PM Maik1 via Geoserver-users <
[email protected]> wrote:

> Have setup GeoServer to work with GeoWebCache. Apparently, I have applied
> most of the tweaks for improving performance and quality, but still have
> rendering issues when using Nearest Neighbor interpolation or GeoWebCache:
>
> Summarizing, I have:
>
>  - Enabled direct integration with GeoServer WMS, tiled=true..etc
>  - Enabled the fullWMS mode, using hints=quality parameter in the URL
>
> I have been using Bicubic interpolation because this produces good results
> for basemaps when viewed as WMS. This is what I get when using WMS+Bicubic:
> <http://osgeo-org.1560.x6.nabble.com/file/t385047/good_result.png>
>
> However, when using Nearest Neighbor+WMS, a white line pattern shows up. So
> lines and labels seem to be "split". This is only a slight change but it
> makes the map pretty much unreadable:
> <http://osgeo-org.1560.x6.nabble.com/file/t385047/rendering_issue.png>
>
> Now, when moving to GeoWebCache with Bicubic interpolation, I expected to
> get the same good results as Bicubic+WMS. However, it turns out that I have
> exactly the same rendering issue when using GeoWebCache.
>
> My guess is that I am doing something wrong in the layer setup that
> generates the rendering issue both in NearestNeighbor+WMS and
> GeoWebCache+whatever interpolation method used.
>
> If possible, I would like to use NearestNeighbor because it requires less
> resources. I think that if I can get the rendering issue with
> NearestNeighbor sorted, then the results will be good in GeoWebCache as
> well. BTW, the rendering issue happens also when using Bilinear method.
>
> Can anybody provide some feedback on what I'm doing wrong with this
> basemap?
>
>
>
> --
> Sent from:
> http://osgeo-org.1560.x6.nabble.com/GeoServer-User-f3786390.html
>
>
> _______________________________________________
> Geoserver-users mailing list
>
> Please make sure you read the following two resources before posting to
> this list:
> - Earning your support instead of buying it, but Ian Turton:
> http://www.ianturton.com/talks/foss4g.html#/
> - The GeoServer user list posting guidelines:
> http://geoserver.org/comm/userlist-guidelines.html
>
> If you want to request a feature or an improvement, also see this:
> https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer
>
>
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/geoserver-users
>


-- 

Regards, Andrea Aime == GeoServer Professional Services from the experts!
Visit http://goo.gl/it488V for more information. == Ing. Andrea Aime
@geowolf Technical Lead GeoSolutions S.A.S. Via di Montramito 3/A 55054
Massarosa (LU) phone: +39 0584 962313 fax: +39 0584 1660272 mob: +39 339
8844549 http://www.geo-solutions.it http://twitter.com/geosolutions_it
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Please make sure you read the following two resources before posting to this 
list:
- Earning your support instead of buying it, but Ian Turton: 
http://www.ianturton.com/talks/foss4g.html#/
- The GeoServer user list posting guidelines: 
http://geoserver.org/comm/userlist-guidelines.html

If you want to request a feature or an improvement, also see this: 
https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer


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