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Image viewer apps linux

xViewer

Linux Mint 20
(x) image viewer

By default, the photo viewer does not support WebP images files.
Add WebP support by installing webp-pixbuf-loader library.
This allows to open WebP files in GNOME Image Viewer, and also displays thumbnails for WebP files in the file explorer.
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sudo add-apt-repository ppa:krifa75/eog-ordissimo   
sudo apt update 
sudo apt install webp-pixbuf-loader

gThumb

(gnome) image viewer
installed version 3.8.0 , latest version 3.12.0
which has support for .avif & .WebP ==if the libheif library is also used==

3.12.0 is not supported by synaptic yet , so you have to install it tusing its PPA 

sudo add-apt-repository ppa:ubuntuhandbook1/apps
sudo apt update
sudo apt install gthumb

or using the software manger (a simular tool in ubuntu is called updater)
or use the flatpack version

after install of 3.12.0 , still no .avif views

https://github.com/strukturag/libheif
which is a HEIF and AVIF file format decoder and encoder.
the .gz needs to be compiled (see github readme)

pix