Mirage is a lightweight, open-source photo viewer, having an intuitive graphical user interface that helps the users to easily view images. Among others, it has support for PGN, JPG, SVG, XPM, GIF, BMP and TIFF formats. Also, it has basic photo manipulation features, like zoom, rotate, crop, resize and has support for creating keyboard shortcuts.
To install just add the following PPA to your system.
sudo add-apt-repository ppa:vexo/ppa
sudo apt-get update
sudo apt-get install mirage