Thanks Jasper,

But I am afraid this problem isn't limited to Gaussian Blur but also exist with other primitives like Turbulence and Morphology.

Try to apply those filters to an object with an image in the background.

ivan

De : Jasper van de Gronde <th.v.d.gronde@...528...>
À : Ivan Louette <ivan_louette@...48...>
Cc : Inkscape-devel@...1722...forge.net
Envoyé le : Sam 3 avril 2010, 17 h 04 min 27 s
Objet : Re: [Inkscape-devel] Filter effect and blur background

(This is regarding "discontinuities" appearing in blurs, when using BackgroundImage.)

Ivan Louette wrote:
> Thanks Jasper !
>
> Try Yann's file I sent back ; it breaks some times and sometimes not...
>
> ivan

I have indeed been able to reproduce the problem, and found a few copy-paste bugs in Gaussian blur (which normally wouldn't be triggered, and as such went unnoticed) in the process. But the real problem seems to be with the way in which the background image is accessed. In essence the background image doesn't take the area enlargement into account that is needed to correctly render the blur.

To properly fix this would probably require a few more changes than I'm comfortable with at this stage in the release cycle, and could take a while anyway, so I've filed a bug (+associated rendering test):
https://bugs.launchpad.net/inkscape/+bug/554649