Command-line how to:

Test your application under Mac osX:
Open yourApplication.app rightclick on the application -> show package content
Contents -> MacOS
open your terminal and drag the Executable File into it.
press space and write filenames with absolute paths separated by spaces:
/yourpath/debug1.png /yourpath/debug2.png /yourpath/debug3.png ...
press enter:
It should run your application and save the images on the given directions.

Test your Application under Windows:
Open command prompt and drag yourApplication.exe into it.
press space and write filenames with absolute paths separated with spaces:
c:/yourpath/debug1.png c:/yourpath/debug2.png c:/yourpath/debug3.png ...
press enter:
It should run your application and save the images on the given directions.