IOS 8.4 How to delete photos on iphone but keep them on my mac
I have an Imac. I have an Iphone (IOS 8.4). I want to delete my photos on my phone to give me more space, but keep them on my Imac. I would like to know what settings I need to put my PHOTOS app on my Iphone. Do I keep the "My Photo Stream" tab on in the Iphone settings? And if so, what program is best for me to transfer my pictures to my Imac (image capture or Itunes)? I do not want to use ICLOUD (it would cost me a fortune to keep all my stuff on the cloud). Can anyone help me?
iMac, OS X Yosemite (10.10.4)