Suvi.org is presenting PhotoFilters an exclusive Ubuntu Application.
PhotoFilters allows you to quickly apply a filter on a photo. It also gives you preview how different filters on your picture look like
After selecting a filter it shows the filter in different strengths and you can choose the modified picture you like by a single click.
Add as many pictures as you want to the picture.
PhotoFilters can be found in the Ubuntu App store. It’s Linux only.