[X4U] PDF preferences?

[Robert (Bob) P Andris]

Was wondering if you can change the "pdf" prefences for the 
ctrl-shift-4 screen shots.  Right now the pictures are saved as Adobe 
Reader pdfs and I would like to switch to Apple "Preview" pdfs. 
Can't find a place to change the owners for the automatic generation 
of the files.  Of course I can do it after the fact - but that does 
get old!  Anyone know how?

Bob