You need to install ranger through your package manager or via the source

You can install the following software:

• python-chardet: in case of encoding detection problems
• sudo: to use the “run as root”-feature
• libcaca: for ASCII-art image previews
• highlight: for syntax highlighting of code
• atool: for previews of archives
• w3m: for previews of images and html pages
• lynx: for previews of html pages
• elinks: for previews of html pages
• poppler: for pdf previews
• transmission-cli: for viewing bittorrent information
• mediainfo: for viewing information about media files
• perl-image-exiftool: for viewing information about media files

ranger --copy-config=all

Output

creating: /home/warnaud/.config/ranger/rifle.conf
creating: /home/warnaud/.config/ranger/commands.py
creating: /home/warnaud/.config/ranger/commands_full.py
creating: /home/warnaud/.config/ranger/rc.conf
creating: /home/warnaud/.config/ranger/scope.sh

> Please note that configuration files may change as ranger evolves.
  It's completely up to you to keep them up to date.

> To stop ranger from loading both the default and your custom rc.conf,
  please set the environment variable RANGER_LOAD_DEFAULT_RC to FALSE. 

We just copied the default configuration files to our home

You can display images in the terminal! just add/modify in ~/.config/ranger/rc.conf:

# Use one of the supported image preview protocols
set preview_images true

By default it is set with w3m:

set preview_images_method w3m

If the images doesn't show up correctly (as for me) please set:

# Draw borders around columns?
set draw_borders true

# Be aware of version control systems and display information.
set vcs_aware true

Works with git/mercurial/bzr
→ http://lists.nongnu.org/archive/html/ranger-users/2013-03/msg00007.html for a complete explanation

Key combination for Ranger:

• https://wiki.archlinux.org/index.php/Ranger
• Main site / Wiki / Documentation