... enhance and enlarge to a more manageable size and scale. This track plan has been taken from screen shots and pieced together, but is only at 72 dpi resolution, and as stated is quite small in size. See second image below. I was wondering if, the algorithm's, mentioned below, that you used to modify the sketchboard images might be of help. Lanczos3 Triangle Mitchell Bspline Bell If so, where can I get these algorithm's so that I can experiment with them? All the best, Brian Nicholls. 1853_271020_290000000.png 1853_271021_340000000.png posted: 27 May 2012 23:23 from: Martin Wynne Brian Nicholls wrote: where can I get these algorithms so that I can experiment with them? Hi Brian, Unfortunately you have missed the boat with the old-maps site. Until recently it was possible to zoom in and display the original scans for screen capture. This option has now been removed, presumably to encourage you to pay £16 for their PDF files. There has been some discussion about this on the OS maps Yahoo group. You would ...