Yes I was using some filtering when resizing the photos after catching them with Imp Pant.
This is with SGrab, using the same palette charged with Fullpalette (same photo that my latest):
http://img17.imageshack.us/img17/2376/vo6g.png
With SGrab it doesn't look as good as it should. BTW yes, now the wallpaper is better using it's same palette... but I don't like that some colors have changed in buttons and so, so I preffer not to use it's palette.