Well I'm not the most experienced with C1, but here is my thought. First, are you talking about the "tif" format file that is an option direct from the Phase one Digital back, or a real computer software produced tiff? The former you can change on your DB to creat IIQ file, if that is where you are getting it from. With the IQ series of DB for instance you have your choice--I never understood why they created a format name that is easily confused with a long time standard (Tiff). If you are talking about a Tiff that has been produced as a result of already processing a RAW file, then there is no going back. If I'm incorrect, I'll happily stand corrected and hopefully there will be an avalanche of responses.