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Iam digitizing this map when I use trace is there any way to trace black lines? (not digitized) bmp file it was

Easy way to make polygons backed is bmp map image

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closed as unclear what you're asking by PolyGeo, Devdatta Tengshe, Fezter, BradHards, Chad Cooper Apr 30 at 14:25

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

    
no image added sorry its not working –  KeunhoKang Apr 9 '12 at 16:16
    
How does the BMP file fit in with tracing lines? Please give more details on exactly what your question is. Thanks –  Boyle300 Apr 9 '12 at 16:36
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2 Answers 2

The Trace tool will only "follow the shapes of other [vector] features", not raster (imagery, like a BMP).

I think what you are really looking for is something like the ArcScan extension, which "allow[s] you to convert scanned images into vector-based feature layers." In particular, see the subsection titled "Interactive vectorization (raster tracing)".

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If the image is not too complex, you could use the Raster to Polyline or Polygon conversion tools to create the vector data, then trace those features.

If the image is fairly simple it should get you close, you may need to play with the smooth line tool to get the conversion output closer.

If your image is very complex you may want to think about using an image editing tool(IrfanView, GIMP, Photoshop) to simplify down to the black lines you were referring to before converting to polylines.

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