"Blend if" function...

Hi @ all,

I'm from Germany, so please excuse my not perfect english.

I'm just working with a logo. I want to have the Background transparent without white Pixels.

Transparent background is not the Problem, but I still have white Pixels or it isn't a smooth edge.

Now I read about the Blend if-function in Photoshop and wonder if, there is something comparable in Photopaint!?

Thanks in advance!