Legacy ImageMagick Discussions Archive

Thank you all for the good replies. Sorry for not being precise enough. I want to get the thickest lines, and the second-thickest lines inside the polygon defined by the thickest ones. I am looking for something like the image below (made using GIMP, and selecting the lines I want by hand - not ...

I am quite new to Imagemagick, but I am OK with programming in VB, Python and R. I have a set of maps as images, with quite bad quality, and I would like to extract the county limits, that are in darker colour. I tried edge detection, but I cannot make it return only the lines I want. I assume I ...