Viewnoir

Has some good features such as the ability to control the action of the mouse wheel (scroll though images in a directory or zoom level). However, it is not in the default repository. Use this if you don't care for Geeqie, however, I still prefer Geeqie.

sudo add-apt-repository ppa:skellat/flow1
sudo apt-get update
apt-get install viewnior

Missing feature: when you zoom in on an image the window does not automatically enlarge.

viewnoir can edit and save which I don't need in an "image viewer."

You can remove the repository without uninstalling viewnoir (I don't necessarily want other software from skellat, but if you do, then leave it.

add-apt-repository --remove ppa:skellat/flow1

If you want to delete a PPA repository as well as all packages installed/upgraded from the PPA, you can use "ppa-purge" command, simultaneously this downgrading installed packages to the version from official mint base. But to keep viewnoir after removing the repository do not "ppa-purge."