[Adobe Illustrator] Creating transparency out of scan
Hey guys,
I have issue crating transparent area on one of my scans.

The thing is, I want to delete inner parts of the fence. I got only one layer, image is vectorized, and the rest works fine, except of fence. I already deleted left part, so you can see what is going on. Afterwards illustrator will select is as whole object, making it unable to delete inside of fence.
Any ideas ?
I also tried to edit this in photoshop, created transparent png, but after vectorizing, illustrator creates black area again.
