Read the tutorial. See Inside too if you want. Can you make the jagged edges disappear from your line art like I did in this? Give it a try! :)
I used my brain just a little to realize that I could subtract the color until everything was white and the black lines would be a different white while the rest would become the same white. If you get what I am saying ... it kind of brick walls which allows for this trick to work. I am glad it does not wraparound.
