i've just been trying to do it in paint.net
i only ever use it to resize stuff, my default edit thing, can't remember how or if you can alter the eraser strength, definitely lightens things up though.
(
god save the queen making another unremarkable comeback,
Sun 2 Nov 2008, 17:08,
archived)
I'll look
but I suppose multiple layers of different opacity might help.
(
FeralCatMan Unusual disease collector.,
Sun 2 Nov 2008, 17:16,
archived)