Opening large TIFFs with Photoshop

Photoshop (CS only?) has a bug when opening TIFF files that exceed a certain size and are compressed using the packbit format. (Exact error message?) When this error occurs, it is possible to open the images if they are compressed using a different algorithm.

Changing the compression can be done with any program that can open the file and save it back. A more convenient choice is to use ImageMagick together with Erik Krauses batch file [1] for TIFF conversion.

There might be problems using LZW compression due to copyright issues. If this is the case, try other compressions. (I forgot which one worked well beside LZW... anyone please?)