I’ve just found this useful mac tool : an automator tool for converting RAW pictures (of just about any camera, 284 different types at the last count, using the dcraw library) called RAWConvert.
So my simple workflow for processing pictures, which so far was bash-based can now be automated ! In fact, most of the script I wrote using ImageMagick I no longer need. Still, it worked well for me, so I’m still quite proud of it.
Update : seems not to work in the latest automator on Leopard. I fired off an email to the developer to see if he can help.