Linework Making Action for Photoshop.
I know some people could use this, so here it is!
Its an action for Photoshop that will turn pencil or ink lines into a layer so you can paint under it. If the lines aren't dark enough, use brightness/contrast to darken the lines while keeping the background white.
It will prompt you to choose a foreground color. Pick the color you want for the lines.
try it out, and let me know how it treats ya!