View Full size images in gallery

Can we please get an option to open the original images in gallery rather than the preview image? Currently the only was to get it is DOWNLOAD and exit the app and view the image in another app, this is terrible. Preview images are for thumbnails, any other viewing condition should be the original image.

How is setting the preview size to full size a solution? That doubles or even triples the disk space used. I have 6000 low res images and the default preview settings causes 20GB of unnecessary previews when the original would suffice.

A simple back end switch is all we need, open preview or open original.