Hi Cécile,
for map generation, antialiasing is controlled here, it can be controlled
via request options, but it defaults to having antialiasing on:
https://github.com/geoserver/geoserver/blob/93ff3a1e9b1c0bd50e69d9734db7ac39213c3c51/src/wms/src/main/java/org/geoserver/wms/map/RenderedImageMapOutputFormat.java#L325
(it gets set on the StreamingRenderer, which immediately sets it onto the
SLDStyleFactory as well)

For legends the antialiasing is not set on the SLDStyleFactory instead, but
I see it set on the graphics
used to assemble the legend (forcefully, without any external control)...
at this point, I'd enable it
all the time on SLDStyleFactory too, yes.

Hope this helps

Cheers,

Andrea Aime


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Ing. Andrea Aime
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On Tue, Dec 3, 2024 at 8:51 AM Cécile Vuilleumier <
cecile.vuilleum...@camptocamp.com> wrote:

> Hi all
>
> I have been looking into the SLDStyleFactory again after we noticed some
> pixelation in GeoServer legend graphics when using an SVG image as point
> symbolizer. You can see an example in the attached files with the style as
> SLD + the external graphic as SVG and the resulting legend graphic in
> legend_0.png (with the following query parameters:
> &width=20&height=20&LEGEND_OPTIONS=dpi:364;fontAntiAliasing:true;forceLabels:on).
>
> Increasing the parameters WIDTH and HEIGHT does not help, as it only adds
> padding around the symbol. But we get much better result when using
> RenderingHints.VALUE_ANTIALIAS_ON here:
> https://github.com/geotools/geotools/blob/80a01af1b6ea405fca6b03fe780b73c0d431890c/modules/library/render/src/main/java/org/geotools/renderer/style/SLDStyleFactory.java#L165
> -> see in the file legend_1.png
>
> Is there a reason not to use antialiasing here (I know it also impacts the
> map rendering) or is there some other way to avoid pixelation?
>
> Thanks in advance and best regards,
> Cécile
> --
> *camptocamp*
>
>
> *Cécile Vuilleumier *
> Geospatial developer
> www.camptocamp.com
> _______________________________________________
> GeoTools-Devel mailing list
> GeoTools-Devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geotools-devel
>
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