Photoshop Action: separate lines from BG

Oops I made this thing a year back and shared it on my tumblr but completely forgot I could submit it here too...

Anyway, this is a shortcut for "separating" your traditional lines (such as sketches or inked lineart) from white background for easy digital coloring. The download button is on the right, if this is your first time downloading stuff from dA.

Let me know if something is wonky, I've never uploaded a photoshop action on dA before!

A few notes:

• The shortcut is ctrl+F10.
• It's advised that you prep your scanned file a bit before executing the action (mainly fixing the black/white levels), anything you'd normally do before starting to colour.
• Uses fill, so your lines will be your foreground colour. You can go back and change the color using blending modes, locking the layer and filling it, or whatever your preferred method is. You can even use gradients and textures in your lines.
• Will only hide your original layer, not delete it, in case you still need it.
• The action assumes that your lines/sketch is still on the background layer (so it’s possible to process multiple pictures on one go) -  if this is not the case you’ll get a pop-up that says "The object background is not currently available", but you don’t need to care about it.
• How to install actions.