View source for 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."