I'm not aware of anything in the public domain which will do the trick (unless
there is a Mac TIFF to GIF converter, and then you can go from GIF to IFF on
the Amiga…), but a company called Active Circuits, Inc. was at the NCGA show
last spring in Philadelphia, and they were showing a program called ImageLink
converting various formats and displaying on various pieces of hardware
(including a Targa 32 board on the PC side of the Amiga…). The sheet I have
on it says they were to support TIFF as an add in module.
The address and number given are: "Active Circuits, Inc. 106 U.S. Highway
71, Suite 101, Mansquan, NJ. 08736. (201) 223-5999." There is no price given
on the flyer.