I need some help.
I used a while ago a technique in PS with Quick mask to remove the white from a black outline drawing. Something with copy and past and cut, or so. But I haven't done it for some time and even if the fate of mankind would depend on it, my brain refuses to remember how I did it. The technique didn't use any brush or lasso tool, just cut or copy in some way with the activated quick mask function at some point.

I'm not sure, but I think I read in one of the subforums about this.

Thanks in advance for any hints.