De : Preben Soeberg <prsodk@...400...>
À : Jasper van de Gronde <th.v.d.gronde@...233.....528...>
Cc : inkscape-devel@lists.sourceforge.net
Envoyé le : Lundi, 20 Avril 2009, 17h18mn 12s
Objet : Re: [Inkscape-devel] The bias property for feConvolveMatrix
I have posted a patch for
https://bugs.launchpad.net/inkscape/+bug/193926The patch fixes the divisor to be calculated automatically by default.
Could you take a look at it and commit it?
> -----Original Message-----
> From: Jasper van de Gronde [mailto:
th.v.d.gronde@...528...]
> Sent: 20 April, 2009 22:00
> To: Erik Dahlstrom
> Cc: Inkscape Devel List
> Subject: Re: [Inkscape-devel] The bias property for feConvolveMatrix
>
> Erik Dahlstrom wrote:
> > On Wed, 08 Apr 2009 14:09:01 +0200, Jasper van de Gronde
> > <
th.v.d.gronde@...528...> wrote:
> >
> >> The SVG standard defines a "bias" property for feConvolveMatrix to
>
>> offset the result of the filter. It specifies that this value should
> >> simply be added to the result for each channel. Implicitly the standard
> >> defines that these are premultiplied color values, however, this seems
> >> to make little sense, as the bias has very little meaning without
> taking
> >> the alpha channel into account.
> >
> > Wouldn't the 'preserveAlpha' attribute[1] be sufficient to control this?
>
> No, imagine that the image already has alpha=0.5, then adding a bias of
> 0.5 suddenly does not correspond to a transparent gray zero response,
> but rather a transparent white zero response.
>
> > ...
> > There should be some precedent, e.g:
> >
> > - Opera 9.x
> > - Firefox 3.1
> > - ASV3
>
> Unfortunately I don't have any of those installed, so if someone
could
> help me test that would be great. I have attached a file that tests
> numerous cases using bias (and transparency), if someone could try it on
> his/her favourite renderer that would be great.
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