DPIChanger

My scanner usually works pretty well, but this particular day it doubled the resolution of all the images I scanned.
As I wanted to make a PDF from them, I was in trouble.
That's when I realized that Automator did not modify this meta-data. (or at least I didn't find how). Which is even more surprising given Preview does support it (yes it does, try to mess with the change image size menu).
So this application (made using the Quick and Dirty(tm) methodology), allow you to load a set of images (just drag and drop them) and change their resolution (the output is always TIFF).

BIG FAT WARNING

This application will use more or less 100% of your resource if you asks too much of it, and OVERWRITES your originals images if they are already in TIFF format.

By the way, if somebody knows how to change an image DPI in Cocoa WITHOUT loading and saving the whole file, please send a email.

Possible enhancements

I join the Universal Binary and the source code, do whatever you want with it.
If you have any use of this and you want me to put some more work into it, contact me (do the same if you found how NOT to use it)

Application (UB, Leopard only)
Source code