VISIO: How do I convert photo to line art to use for patent dwgs?

[Kathryn Pundt]

I frequently am supplied with photos or color drawings that need to be
converted into crisp line art. Does Visio have that ability?

 

[David Parker]

No

 

[Jüergen Schürhoff]

You have to vectorize the pixel graphics!
For doing this You need special tools for vectorization.
See
http://en.wikipedia.org/wiki/Comparison_of_raster_to_vector_conversion_software