Thanks a lot for your work !!!
ivan
________________________________
De : Preben Soeberg <prsodk@...400...>
À : Jasper van de Gronde <th.v.d.gronde@...528...>
Cc : inkscape-devel(a)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/193926
The 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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