Essentially, it’s like painting over the whole image, instead of altering specific elements. When you want to make changes to a raster image, any edits you make will be made to the entire image. They’re not always ideal, however, as they come with many disadvantages. Raster images-like JPEGs and PNGs-are mostly used for photographs, they are programatically simple to create and display since they are effectively a grid of color blocks. So, what’s the difference between raster and vector files? To put it simply, vector images are much more suitable for CAD. Tracing is the process of drawing over a raster image with vector lines, and other vector entities such as beziers, polygons, text strings and so on. This then gives you a vector output. Automatic Tracing: Converting an architectural drawing (TIFF) to a vector CAD format (DXF) in Scan2CAD
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