Cheap Reverse Engineering using AutoTrace

If you are into 3Dprinting  you are probably doing a lot of ReverseEngineering using your phone's camera as a 3DScanner .
You probably know that pictures can be inserted in SOLIDWORKS  and used for tracing sketches and develop models.
You might even be aware that the Professional  and Premium  versions can do AutoTracing , probably tried the tool and were very unhappy with the results.
Turns out there is a simple trick  that makes AutoTracing work better.
This tutorial  presents it:

https://www.youtube.com/watch?v=JX0tC6eym5A