I opened fiddler to watch the WMS URL. Here it is :

http://www502.regione.toscana.it/wmsraster/com.rt.wms.RTmap/wms?map=wmsctr&map_resolution=91&language=ita&&SERVICE=WMS&VERSION=1.3.0&REQUEST=GetMap&BBOX=4874693.290393243544,585753.4275104458211,4898190.069728096016,616440.7875092165777&CRS=EPSG:6707&WIDTH=1084&HEIGHT=830&LAYERS=rt_ctr.5k.mosaico_catastale.rt&STYLES=&FORMAT=image/png&DPI=96&MAP_RESOLUTION=96&FORMAT_OPTIONS=dpi:96&TRANSPARENT=TRUE

The TRANSPARENT parameter has TRUE value but I don't know how to force to FALSE.

I watched layer's metadata, here it is :

Maybe QGIS read that the layer can be transparent so it adds the parameter.
You should try to configure your server to tell you don't want this layer to be transparent.


Nicolas BOISTEAULT
Le 02/12/2016 à 15:34, Andrea Peri a écrit :
forgot:

image format:
png
A.


2016-12-02 15:33 GMT+01:00 Andrea Peri <aperi2...@gmail.com>:
Hi,
the url of my wms is this:

http://www502.regione.toscana.it/wmsraster/com.rt.wms.RTmap/wms?map=wmsctr

the layer in my test is:
rt_ctr.5k.mosaico_catastale.rt

A.


2016-12-02 15:24 GMT+01:00 Andrea Peri <aperi2...@gmail.com>:
Ho, i dont know the url invoked by qgis.
I guess this because the returned map has White transparen.


Il 02 dic 2016 2:13 PM, "Nicolas Boisteault"
<boistea...@observatoire-environnement.org> ha scritto:
Hi Andrea,

In QGIS 2.18, I don't have the BGCOLOR parameter added. What is your WMS
url?

Nicolas BOISTEAULT
Développeur Web/WebSIG
Observatoire Régional de l'Environnement

Le 02/12/2016 à 07:53, Andrea Peri a écrit :

Hi,

Is the "wms provider" adding always a parameter BGCOLOR=0xFFFFFF to
every GetMap request ?

I notice my maps have all the white color transparent.
I don't understand f it is a default of my wms server or is a hidden
parameter added by QGIS client.

Thx,
A.



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Andrea Peri
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