A quick question about desktop-image rendering on XFCE4

Olivier fourdan at xfce.org
Sun Aug 29 01:02:26 CEST 2004


The problem described is visible on 16bit displays and is due to the
dithering from GdkPixbuf. Nothing we can do about, that's notrelated to

Just try to switch to a 24 bit display mode.


On Sun, 2004-08-29 at 00:46, Brian J. Tarricone wrote:
> i haven't seen this problem before, though i think i recall someone 
> talking abuit it quite some time ago.
> first of all, are you using xfce 4.0.x, or CVS?  desktop handling has 
> changed somewhat since 4.0.x, so the problem may have disappeared.  
> second, are you using a non-standard X visual, or perhaps a low bit-depth?
> you can find the visual by running 'xdpyinfo'.  look for a line that 
> reads "default visual id", then find a "visual" section that matches the 
> id number.  the "class" and "depth" fields in that section are the ones 
> in which i'm interested.
> as for the handling itself, xfdesktop CVS resizes and composites using 
> bicubic interpolation, so i wouldn't expect there to be any odd 
> dithering effects.  i don't recall offhand what 4.0.x does, but i can't 
> imagine that it's much different.
>     -brian
> Peter N. Spotts wrote:
> >Folks,
> >
> >I've noticed that with some computer-generated art, XFCE4 renders as
> >subtle but discreet bands of color portions of images that KDE or Gnome
> >show as smooth changes from light to dark. Often this happens in skies,
> >clouds, or other objects where contrast changes quite a bit over a
> >fairly short stretch of screen. This even happens with some photos,
> >where colors in clouds or sunsets look a bit like patchwork rather than
> >blending smoothly from one tone to another. 
> >
> >Is this a "dithering" issue (not that I could explain what "dithering"
> >is)? Or just a difference in the way XFCE4 renders images v. KDE or
> >Gnome? I'm using SuSE 9.1 on a Toshiba satellite laptop, if that's of
> >any help. Obviously, this is not a showstopper, but inquiring minds want
> >to know...
> >
> >With best regards,
> >
> >Pete
> >
> >
> >  
> >
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 - Olivier Fourdan - fourdan at xfce.org - http://www.xfce.org - 

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