2007.12.09 14:44 "Re: [Tiff] dpi settings", by Graeme Gill
A rather nugatory remark, especially given the existence of the RATIONAL type in TIFF. I think around the time of TIFF's conception it was not unusual in Europe to specify pixels per centimetre, which might explain the choice of base unit. But really, does it matter?
Only that it seems to be echo'd in some applications (Photoshop comes to mind, although maybe more recent versions have addressed this), and I'm therefore wondering if it's generally understood in the U.S. that cm is not a preferred metric unit, and in practice seems to be falling out of popular usage in the rest of the world.