If you want to download photos from Google Photos in full size, then select the photos which you want to download and then click "Download" button. This will download the largest version of the photo which is stored in Google Photos. Whether this is the full size original or a compressed version, it will depend on the options you choose when uploading the photo.
You have another option to download full size backed up photos. To do so, go to "https://plus.google.com/u/0/photos/yourphotos" and sign in to your account. You will see all your photos and videos. Open the album and select the photo which you want to download. Click "More Actions" tap located at the top of the photo and select "Auto Enhance" option and then select "Off" option.
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