Catalyst doesnt load 3d models at the moment.
( but support for .obj files is in pixelmad )
jpegs, are fine. tiff files are fine.
Catalyst uses quicktime - so they files formats that quicktime loads are normally - but not always OK.
http://www.apple.com/quicktime/produ...fications.html
Some image files can be too big to load into catalyst.
The largest file you can load is 2048x2048.