Open the image in Photoshop.
Run the highpass filter
Filter/Other/highpass
then run the threshold filter
Effects/threshold
Play with the settings to get the best result
If you run highpass first you will get more detail in the threshold conversion.
http://www.yourimagehost.com/is.php?...4&img=Hand.jpg
take the black and white into a vectorizing program to trace to vector for working in corel or illy.