[Qgis-user] Transparency for vector symbol layers

[Benoît Laurent]

Hello Andreas,

Thank you very much for your complete answer.

Actually, I reached my goal using rule based renderers.

Regards,

Benoît

> Hi Benoit,
>
> It depends. Yes - you can mix transparent and opaque features. For 
> each color you can also set the opacity/transparency value.
>
> However, if two features overlap and you use transparency on the 
> feature level, you can see the features shine through - whereas when 
> the transparency would be on the symbol level (which isn't implemented 
> yet in QGIS) you would first composite all elements in a symbol level 
> and then apply the opacity on the whole group. See 
> http://www.w3.org/TR/2011/REC-SVG11-20110816/masking.html#ObjectAndGroupOpacityProperties 
> for the difference. In 
> http://www.w3.org/TR/2011/REC-SVG11-20110816/images/masking/opacity01.png 
> - if you look at the bottom row of circles - the second pair of 
> circles has the opacity on the group of two circles, whereas the third 
> pair has opacity on every single element. I hope you can see the 
> difference.
>
> It would be very cool if QGIS could have a more fine-grained opacity - 
> new opacity on symbol level and new opacity on a whole group of 
> layers. It would make the cartographic options even better ;-)
>
> Andreas
>
> On 19.06.2015 16:40, Benoît Laurent wrote:
>> Hello,
>>
>> I noticed this feature request : https://hub.qgis.org/issues/3438.
>>
>> Is it possible to have semi-transparent and opaque features within 
>> the same layer ?
>>
>> Best regards,
>>
>> Benoît
>>
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