Showfoto is a free and open source image viewer, management and image editor for Linux. It is based on popular digiKam image editor. It is released under GNU General Public License v2.0 or later. It comes with powerful image editing tools to view your photographs and you can edit and improve them easily. You can import your photos directly from google photos, smugmug and remote locations and export to many online storage and photo services directly.
Some popular effects are film grain, blur, charcoal drawing, color effects, distortion, emboss, oil paint, rain drops, blacl white, color spaces, color negative and more.
How to install Showfoto on Ubuntu Linux
Showfoto is available from Ubuntu default repositories. Open terminal app (ctrl+alt+t) and run below commands to install Showfoto on your system.
sudo apt update
sudo apt install showfoto