Hi Dieter,
It could be possible that your MapServer installation was compiled with
Pixman library support enabled in MapServer, which unfortunately causes
a known bug where opacity does not work (see
https://github.com/MapServer/MapServer/issues/5343 ). I believe we
should completely remove Pixman support from MapServer in a future
release, as so many users hit this issue each year.
In other words, make sure that you set -DWITH_PIXMAN=0 when compiling
MapServer from source.
PS. I actually used the small mapfile included in that ticket, for
testing now with today's MapServer 8.3-dev on MS4W 5, on Windows, and
successfully generated a proper map image (with opacity) with map2img.
thanks,
-jeff
--
Jeff McKenna
GatewayGeo: Developers of MS4W, & offering MapServer Consulting/Dev
co-founder of FOSS4G
http://gatewaygeo.com/
On 2024-08-07 9:53 a.m., GOGIS Dieter Zuberbühler via MapServer-users wrote:
What happend to the 'Layer Composite Opacity' in Mapserver>=8.0? I
tried several versions of Mapserver 8.x on Ubuntu 22.04 and 24.04 and
had always the same result: 'Opacity on Layer Level' is ignored and the
background layers are not visible.
I tried with map2img and phpng (swig), same result.
In the documentation it is still available and the mapfile is parsed
correctly. I can get and set the opacity with php and it will be
written down (save to mapfile) correctly.
Any hint, is this removed or a known problem?
Thank you in advance,
Dieter
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