It can be a time-consuming process, which is why many opt for automatic tracing instead. This can be done with your computer mouse or with a graphics pen and tablet. As the name suggests, manual tracing involves drawing over a raster design by hand. You can choose to trace manually or automatically. This is all possible with industry standard vector file formats such as DXF and DWG. If, for example, you work in architectural design you may wish to assign co-ordinates and real-world measurements to a vector element such as a line representing a wall. Similarly, if you have an old technical drawing, you can scan it and convert it to a vector. If you have a raster image that you want to use in CAD software, you can trace it to convert it to a vector. By using vectors, you can edit individual elements and re-use them when you start a new drawing. Vector files are the industry-standard format in CAD. Tracing is the process of identifying objects within the image and converting them to their appropriate vector entity. Each element can also contain masses of data, making vector images perfect for CAD work, which often involves creating designs which replicate real-world objects. Meanwhile, it is possible to edit each individual element within a vector image without impacting on the rest of the image. In other words, vectors are infinitely scalable. They’re made up of paths, which means that you can scale the image up and down as much as you’d like without impacting the quality of the image. In contrast, vector images are mathematically perfect. This means that rasters are resolution dependent. Additionally, rasters are made up of pixels which affects the quality of the image when you try to resize it. 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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