I also have experimented on vh units for full size images with captions, it works but when you rotate the device from portrait to landscape or reverse, this implementation breaks. (epubsecrets.com)
Clicking on graphics will show full sized images of the example plots. (esrl.noaa.gov)
To print Protocols with full size images, please add those Protocols to your Toolkit and Generate a Report. (phenxtoolkit.org)