Here's how you would do it in photoshop-
1- go to image->adjust->threshold to turn all of the grayscale images into just black and white. Photoshop has a little bar that you can slide to change the threshold level. Play around with it until you get a good outline without it getting dirty with extra speckels.
2- Change it to RBG Color Mode
3- Go to select->Color Range. It'll show your picture either as it is with black lines and a white background or vice-versa. Click the black lines until it has a black background and white lines. This will automatically "lasso" all the lines in your drawing.
4- Cut and Paste in a new layer.
5- Ta da!
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