Another easy way to transfer images from your iPhone to your Mac is with a built in app called Image Capture
1 Plug your iPhone to your Mac using the USB cable
2 Start Image Capture, a free app that comes with your Mac
3 You should see your iPhone selected and image previews.
You can select individual images or import all at once. At the bottom you can select where the images are copied to.
On the left side you can also select to delete images after import, and also a default program to run when you connect the iPhone.
Also an easy way to transfer images is with Preview