You can extract the file path from a container field with:
GetValue ( containerField ; 2 )
Thus you could write this script to delete one picture using data from one container field:
Set Variable [$FilePath ; Value: GetValue ( YourTable::YourContainerField ; 2 ) ]
Export Field Contents [$FilePath]
A looping script could delete all the records for a found set of recors or all the records in your database.
It won't, I don't think so anyway, move them to the trashcan. You might want to use Export Field contents to first export the picture to a folder on your desk top before using the above Export Field Contents [$FilePath] step to delete the original. Then you can review the contents of this folder before dragging it to the trash and deleting all your image files permanently.
There are also file plug ins you can acquire and use to get more specific control over files than you can with just Filemaker.
That sounds perfect, I'll give it a go. Where they go isn't an issue, if it goes to a temp folder on the desktop that I then delete the files from, that also works to my liking (I hadn't actually considered that option)
Thanks for the help.