killing shadowing

[Brian Wootton]

I've got KDE 4.4.2 , Lucid, 64amd

Can anybody tell me how to kill shadowing/ tailing  please,
I've been round and round settings trying anything which
I think might do it but no luck - I've probably missed some-
thing obvious.
It is very irritating when I'm trying to adjust
colour levels in a graphic using gimp for instance. Sometimes
these 'shadowings' flash on and off 2 or 3 times a second.
I can't really understand why anyone would want character
and icon tails or shadows, is it supposed to pretty up the screen
or something? I certainly don't want horizantal stripes/ bars
all over the konsole screen.
  I don't see them in any screen-savers, how does this app.
kill them.
brian