Geeqie can display files for which there are existing pixbuf loaders. In addition to the standard ones included with most distributions, the following loaders may also be available to you.
However, in some cases you are required to compile and install them yourself.
Example installation script:
sudo apt-get install libglib2.0-dev libgdk-pixbuf2.0-dev libwebp-dev wget https://github.com/aruiz/webp-pixbuf-loader/archive/master.zip unzip master.zip cd webp-pixbuf-loader-master ./waf configure ./waf build sudo ./waf install