Step 1. Make sure the Image Capture application is installed in your Mac and then use a USB cable to connect the Android device to the Mac.
Step 2. From the Applications folder, launch Image Capture and then select your device under the "Devices" list (found on the left side of the app). The image below shows an example with the Nexus 7.
Step 3. Select the photos that you want to transfer and then click on "Import". If you wish to transfer all then click "Import All". You will be prompted to choose where you wish to save them on the Mac.
When done, you will be able to see the imported photos because they will be marked with green check marks.