Sync your phone and uncheck the folder that has those photos to just delete from phone, or to delete the photos all together you would delete them from your computer.
I found it odd that Apple would not let you delete photos from your phone unless they are in the camera roll. Very annoying. Anyone think they will change this?
Sync your phone and uncheck the folder that has those photos to just delete from phone, or to delete the photos all together you would delete them from your computer.