Need image editor to make background transparent

[Mosey]

I'm looking for an image editor to make the background transparent. I have a drawing (of a schematic), which is black on a white background. I need to change the background to transparent. Is there any standard Mac software or Shareware that will do this?

 

[eleven2brett]

Gimp. Its free, and has a surprising amount of features for being so. http://www.gimp.org/