Thanks for the quick reply! So scipy is making temporary files in /private/vars/folders/w4/<long dir name>/
1. When in the correct folder within Terminal, on the command line I can do: open <filename> And it will open it in Preivew. 2. However, when opening Preview first, it is impossible (for me) to navigate to the /private directory to open the file that way, even with: defaults write com.apple.Finder AppleShowAllFiles YES turned on. 3. When I run imshow() (my attempt to 'launch Preview from scipy as you suggested). The UID of the process is 501, which is the same as when I do echo $UID. So I'm assuming the launched Preview is running as myself. 4. When the temporary file is originally created its permissions are -rw------ Does any of that information help? Thanks again. -- https://mail.python.org/mailman/listinfo/python-list