I use GIMP, an image retouching and editing tool released under GPLv3 license, to do this modifications. Analysis of the source image: clean, fix some contour and selection of the interested part.In these cases I perform the following operations: Otherwise I use Inkscape, vector graphics editor GPL licensed, to convert the maps in DXF format. Well, if I have to do small additions in this file, I can simply import it in CAD like a raster image. Other Regions don't have this chance and most I can obtain is a TIFF georeferenced. Luckily in my Region, through the GeoPortale Regionale, I can download maps in DXF format, like you can prove clicking in this page Infrastruttura dei Dati Territoriali del Veneto - Catalogo dei Dati. Sometimes I have to draw over a raster image, and if it is a map, I have many details to modify or semplify. The final result, nevertheless with some limitations and lacks, allows you a more productivity and improves the quality of design.
In this short tutorial I will explain how you can convert cartographic maps available in TIFF format to DXF, a vectorial standard available in most CAD software.
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