To disable Image Capture: With the device plugged in via USB, open Image Capture. In the bottom left corner of the main application area, you should see the name if your iDevice and the text “Connecting this iPhone opens:” followed by a dropdown. Click No Application.
To make iTunes open when you plug in your device: Open iTunes with your iPhone/iPad/iPod connected. Select your device under Devices in the left column. In the main window, scroll down to Options. Check “Open iTunes when this iPhone is connected.“