Google+ now supports full res images, but only if you sideload them through Google Drive
Over on his blog, Trey Ratcliff has spotted something very interested over on Google+: that you can upload a full sized image to the social network, if you go about doing it right. He noted that if you upload a full resolution image to your Google Drive, and then add the image to Google+ from said Drive, it shows up as the full size — even with his images that are more than 7,000px wide.
Here's how Ratcliff lays out uploading the images:
1) Get your Google Drive going. You might want to make a directory called “Photos” or several other subdirectories so you don’t dump your photos into the root folder and make a big mess.
2) Upload your hi-rez photo to Google Drive. There are about seven different ways to do this. I have the Mac Client, so I just do it locally, and they evaporate up to the cloud while I get coffee. But you can also use the web Google Drive interface to manually upload. [now your hi-rez photo is there and you can do whatever you want with it... I'll show you how to share on Google+ next]
3) Get on Google+ and go share a photo. Click on that little photo icon, then the little down (more) arrows. Choose “from Google Drive” then go navigate and find the photo. After you share and click Photo Details on the right, you’ll see it’s the original size!
Ratcliff also spotted how to link to various sizes of the same image by tweaking the URL, allowing you to embed or link to any image width that your heart desires. So for anyone who wants to put the full, big version of their photos up on Google+, this is the way to go about doing it.
Hopefully, we'll see a mroe straightforward method in the near future, that doesn't require you to make two separate Google services play nicely together before working.