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Some of my old greetings card designs have been hand coloured, and I really want to do very little work on them to reclaim my line drawings. I've popped them into streamline, turned them halftone and fiddled with levels on PS and PSP but I still can't reduce the pics to a nice crisp b&w drawing. Anyone any tips, or know any filter that can just lift the outlines without too much work?

Maybe you can post an example of your hand colored cards. There are different methods to turn color images into drawings.