De : Niko Kiirala <niko@...1267...>
À : inkscape-devel@...349...orge.net
Envoyé le : Samedi, 21 Mars 2009, 19h45mn 24s
Objet : [Inkscape-devel] Colour banding in filters? (was: Inkscape 0.47)
Sat, 21 Mar 2009 17:16:09 +0700
"Preben Soeberg" <
prsodk@...400...> kirjoitti:
> > 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.
Yes, that's true. And it's not only blur and contrast manipulation.
Most filter combinations would benefit to some extent from using
16-bit colours.
However, as there have been claims that banding can occur even with
blur only, I've tried running some tests. And well, I've found nothing.
All blurs are as smooth as they can be. Naturally, as we are producing
images with 8 bits per channel, the quantization error is inevitable
but that's hardly visible at all. (OK, it's inevitable with any
bitdepth, but a lot smaller with higher bitdepths)
Could someone provide a small example file (SVG) exhibiting banding
with simple blur? Or any pointers whatsoever for finding them.
--
Niko Kiirala
niko@...1267...------------------------------------------------------------------------------
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