Hello all,
Since I had a close look to filter effect, I noticed something :
When zooming, the specular lighting filter is very ugly (here a screenshot http://lesgeorges.org/subdomains/pannini/media/specular_lighting.png
But that's not an inkscape issue, there is the same problem is Batik.

Apparently (as far as I understood) this filter is raster-based and the FilterRes values are responsible for the quality.
I just wanted to know what do you think of this.

(here is the svg example : http://www.w3.org/TR/SVG11/images/filters/filters01.svg)

Thanks for your response
Steren