A quick question about desktop-image rendering on XFCE4

[Olivier]

Peter,

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
xfce.

Just try to switch to a 24 bit display mode.

Cheers,
Olivier.

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 -