--- {"title": "How to clean up a scanned drawing for CNC router machining", "description": "Clean up a scanned drawing for CNC router machining: prepare the scan, trace it to vector, tidy the lines, and export a file your CAM software reads.", "url": "https://texhouse.us/how-to-clean-up-a-scanned-drawing-for-machining-for-cnc-router-operators/", "date": "2026-10-12"} --- Clean up a scanned drawing for CNC router machining: prepare the scan, trace it to vector, tidy the lines, and export a file your CAM software reads. Prepare a clear scan of the drawing, trace it to vector shapes, remove background marks, tidy curves and corners, limit the colours to what your cutting plan needs, then export a format your CAM software accepts. | Option | Price and licence | Platforms | |---|---|---| | VectorMagik | Free for everyone; business use needs a licence under PolyForm Noncommercial 1.0.0 [^1] | Windows x64, macOS on Apple Silicon and Intel, Linux x64, and a browser version [^1] | | Other desktop tracing programs | Check the program's own page | Check the program's own page | | Web-based tracing services | Check the service's own page | Check the service's own page | ## What you need before you start Have the original paper drawing and the best scan you can make of it. Scan with the sheet flat and square to the scanner so the lines come out straight. Save the untouched scan as a separate copy so you can start again if an edit goes wrong. Write down the finished size the part must be, in the units your router uses. Scanned images often open at the wrong scale, so you will need this number to check the result. Know which file formats your CAM software accepts, because that decides which export you need at the end. Finally, have a program that traces a picture into vector shapes. VectorMagik traces a picture into vector shapes using its own engine [^1]. For any other tracing program, confirm that it can export a format your CAM software reads before you spend time editing. ## Step by step 1. Open the scan in your tracing program and check its size against the finished size you wrote down. 2. Trace the bitmap into vector shapes. VectorMagik creates vector shapes from the bitmap using its own engine [^1]. 3. Compare the vector with the original image before you edit anything. VectorMagik lets you compare the vector with the bitmap side by side, or flip between them with the B and V keys [^1]. 4. Smooth the lines so the curves are clean. In VectorMagik, a setting merges neighbouring curve pieces, and an automatic option picks the largest merge that still keeps the picture [^1]. 5. Remove background areas and extra shades. In VectorMagik you can click shapes to delete them, such as a background, or merge two shades into one [^1]. 6. Tidy the corners and points. VectorMagik lets you move or delete curve points and round individual corners after converting [^1]. Stray points left behind can become unexpected cuts, so look for them. 7. Limit the colours to the number your cutting plan needs. VectorMagik lets you limit the result to between 1 and 64 colours [^1]. 8. Add a border only if the part needs one. VectorMagik can add a die-cut outline with a border, white rim and optional drop shadow [^1]. 9. Export a format your CAM software reads. VectorMagik can save the result as SVG, PDF, EPS, AI, DXF, EMF or PNG [^1]. 10. Load the file into your CAM software, check the toolpaths and the size, and cut a test piece before you cut the real part. ## Tools that can do it VectorMagik is made by the team that publishes this site. It traces a picture into vector shapes using its own engine [^1]. It is free for everyone, and business use needs a licence under PolyForm Noncommercial 1.0.0 [^1]. Downloads exist for Windows x64, macOS on Apple Silicon and Intel, and Linux x64 [^1]. A version runs in the web browser using the same engine [^1]. A command-line version does the same work without a window [^1]. Other desktop tracing programs can do this job. This page has no published facts about any specific one, so check each program's own page for its price, its licence, the systems it runs on, and the export formats it writes. Look for DXF or another format your CAM software reads, because a tracer that cannot save that format adds a conversion step. If you consider a web-based service, check its own page for its fees, how it handles your drawing files, and whether it returns a format your CAM software accepts. If you already own a CAD program, check whether it can trace an image and whether it exports the file type your router needs. ## Common mistakes to avoid Skipping the colour limit can leave more shades than your cutting plan can use, and each extra shade may add setup work at the machine. Trusting the first trace without comparing it to the original hides errors that only show up after export. Compare the vector with the scan before you change anything else. Smoothing curves until small detail disappears removes features the part needs, so the cut comes out different from the drawing. Leaving stray points or background shapes in the file gives the CAM software extra paths to cut. Exporting before you check the format your CAM software accepts can waste a lot of time. Test a small file first. Forgetting to check the size against the finished dimension lets an error through silently, because the scan may not match the drawing's scale. ## Frequently asked questions ### Is VectorMagik free to use for commercial CNC work? VectorMagik is free for everyone, but business use needs a licence under PolyForm Noncommercial 1.0.0 [^1]. Read that licence text yourself before you decide, and check whether your shop's use counts as business use under its wording. Then confirm the export format your CAM software accepts before you start a real job. ### Can VectorMagik export a DXF file for a CNC router? VectorMagik can save the result as DXF, along with SVG, PDF, EPS, AI, EMF and PNG [^1]. Whether your CAM software accepts a DXF file depends on that software, so load a test file first. Check that the shapes arrive at the size you set and that the cut paths follow the drawing. ### Does tracing a scanned drawing need a fast computer? Downloads are available for Windows x64, macOS on Apple Silicon or Intel, and Linux x64 [^1]. A browser version uses the same engine [^1]. Large scans take longer to trace on any program, so use a scan that shows the lines clearly without being larger than you need. Check the system requirements on the program's own download page before you install it. ### How many colours should a drawing keep before routing? VectorMagik lets you limit the result to between 1 and 64 colours [^1]. Pick the count your cutting plan needs. Each shade you keep may need its own pass, so an extra shade can mean extra setup at the machine. ### Can VectorMagik trace drawings from a command line? A command-line version does the same work without a window [^1]. It also lets an AI assistant trace pictures on your computer [^1]. Use it when you trace many scans the same way, and open one output in your CAM software to confirm it cuts as expected. Free for everyone; business use needs a licence (PolyForm Noncommercial 1.0.0). [^1] - [Visit VectorMagik](/go/start-vectormagik) ## Sources [^1]: VectorMagik's own description of itself (the product of this site's publisher) (/go/start-vectormagik)