On 9 Apr, 10:11, "Dave Plowman (News)" wrote:

*Of course I could just use this as a guide and draw an entire new
one - but wondered if it was possible to clean up the track edges and
produce only B&W in software?

Of course. However that's just reducing the colour depth, not
straightening the edges. An edge detection filter can be useful for
that,although it will change the proportions a little. Best of all
(complicated, but allows editing afterwards) is to import the bitmap
into an SVG editor like Inkscape and then convert it all to line
segments.