Notes:

Update: Geez, this is proving to be quite the finicky Loss edit…
- As far as I can tell, the most reliable way to do this is by clicking on the image a couple times and downloading the full-size version. DON'T use the smaller one, as the black and white bleed together a bit and no-tolerance fill tools won't recognize it.
- If you decide to take a screenshot, be sure not to capture any area outside the image itself, or else the fill will just go around the border and fill in areas it shouldn't.