Re: [Inkscape-devel] filters UI

Sat, 21 Jul 2007 16:09:48 -0300 "bulia byak" <buliabyak@...400...> kirjoitti:

...

I would also like to see some feComposite presets in that list.

Sure, one thing I would really enjoy is inverting the background - is this possible with feComposite?

Well, theoretically yes. With factors 0, 0, -1, 1, the compositing equation ends up as 1 - (colour of in2)

The problem here is, the alpha channel gets inverted, too. All the nice opaque inverted colours end up as transparent areas and transparent areas become opaque white.

For some odd reason, it seems that the source graphic ends up affecting the output with those factors, even though it clearly should not...