Even simple blur without any use of feBlend svg primitive causes banding at display and png export.

But this is also the case with gradients.


De : Preben Soeberg <prsodk@...400...>
À : Niko Kiirala <niko@...1267...>
Cc : inkscape-devel@...1850...et
Envoyé le : Samedi, 21 Mars 2009, 11h16mn 09s
Objet : Re: [Inkscape-devel] Re : Inkscape 0.47 - was Re: GSoC 2009 - Project handling in the repository



> -----Original Message-----
> From: Niko Kiirala [mailto:niko@...1267...]
> Sent: 21 March, 2009 16:31
> To: inkscape-devel@lists.sourceforge.net
> Subject: Re: [Inkscape-devel] Re : Inkscape 0.47 - was Re: GSoC 2009 -
> Project handling in the repository
>
> Thu, 19 Mar 2009 21:47:07 +0000 (GMT)
> Ivan Louette <ivan_louette@...48...> kirjoitti:
>
> > "256 levels is not a limitation of SVG itself, but a limitation of
> > Inkscape rendering engine. Using more than 8 bits per colour
> > component would help with this problem, but likely would require
> > quite a bit of work."
> >
> > It has some consequences on the blur quality (banding problems) and
> > also the progressiveness of the height maps (odd plateaus). I don't
> > know if this work could be done for the 0.47 release. I can't
> > evaluate the amount of work because I am not a programmer. However
> > that's not a limitation for my work on filters.
>
> If there is banding visible with blur, moving to higher bitdepth is not
> going to help (unless there are some quality-loss bugs in blur
> rendering): even if Inkscape internally used 16-bit colours, they must
> be converted to 8-bit to be displayed on screen. Some kind of dithering
> might help, though.

The banding comes mostly from contrast manipulations, and having 16 bit
representation of colors would alleviate that.

>
> --
> Niko Kiirala
> niko@...1267...
>
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