Icon for filter tool / adjustement layer in krita

[Cyrille Berger]

> I really do like the last one -- the red filter. It reminds me of the
> filters my dad had with his analog camera decades ago and which fascinated
> me no end.
That's because I have one of those filter for black & white pictures :) (yes I 
am old fashion when it comes to pictures  ;) ) but as Casper have notice on 
IRC every users of krita might not know what is it.
-- 
--- Cyrille Berger ---